HMI) Investigation for the Solar Dynamics Observatory (SDO
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Arxiv:2101.07204V1 [Astro-Ph.SR] 18 Jan 2021 1
submitted to Journal of Space Weather and Space Climate © The author(s) under the Creative Commons Attribution 4.0 International License (CC BY 4.0) On a limitation of Zeeman polarimetry and imperfect instrumentation in representing solar magnetic fields with weaker polarization signal Alexei A. Pevtsov1, Yang Liu2, Ilpo Virtanen3, Luca Bertello1, Kalevi Mursula3, K.D. Leka4;5, and Anna L.H. Hughes1 1 National Solar Observatory, 3665 Discovery Drive, 3rd Floor, Boulder, CO 80303 USA e-mail: [email protected] 2 Stanford University, Stanford, CA, USA 3 ReSoLVE Centre of Excellence, Space Climate research unit, University of Oulu, POB 3000, FIN-90014, Oulu, Finland 4 NorthWest Research Associates, 3380 Mitchell Lane, Boulder, CO 80301 USA 5 Institute for Space-Earth Environmental Research, Nagoya University, Furo-cho Chikusa-ku Nagoya, Aichi 464-8601 Japan ABSTRACT Full disk vector magnetic fields are used widely for developing better understanding of large-scale structure, morphology, and patterns of the solar magnetic field. The data are also important for modeling various solar phenomena. However, observations of vector magnetic fields have one important limitation that may affect the determination of the true magnetic field orientation. This limitation stems from our ability to interpret the differing character of the Zeeman polarization signals which arise from the photospheric line-of-sight vs. the transverse components of the solar vector magnetic field, and is likely exacerbated by unresolved structure (non-unity fill fraction) as well as the disambiguation of the 180◦ degeneracy in the transverse-field azimuth. Here we provide a description of this phenomenon, and discuss issues, which require additional investigation. -
Activity - Sunspot Tracking
JOURNEY TO THE SUN WITH THE NATIONAL SOLAR OBSERVATORY Activity - SunSpot trAcking Adapted by NSO from NASA and the European Space Agency (ESA). https://sohowww.nascom.nasa.gov/classroom/docs/Spotexerweb.pdf / Retrieved on 01/23/18. Objectives In this activity, students determine the rate of the Sun’s rotation by tracking and analyzing real solar data over a period of 7 days. Materials □ Student activity sheet □ Calculator □ Pen or pencil bacKgrOund In this activity, you’ll observe and track sunspots across the Sun, using real images from the National Solar Observatory’s: Global Oscillation Network Group (GONG). This can also be completed with data students gather using www.helioviewer.org. See lesson 4 for instructions. GONG uses specialized telescope cameras to observe diferent layers of the Sun in diferent wavelengths of light. Each layer has a diferent story to tell. For example, the chromosphere is a layer in the lower solar atmosphere. Scientists observe this layer in H-alpha light (656.28nm) to study features such as flaments and prominences, which are clearly visible in the chromosphere. For the best view of sunspots, GONG looks to the photosphere. The photosphere is the lowest layer of the Sun’s atmosphere. It’s the layer that we consider to be the “surface” of the Sun. It’s the visible portion of the Sun that most people are familiar with. In order to best observe sunspots, scientists use photospheric light with a wavelength of 676.8nm. The images that you will analyze in this activity are of the solar photosphere. The data gathered in this activity will allow you to determine the rate of the Sun’s rotation. -
FY 2002 Provisional Program Plan September 10, 2001
• National Solar Observatory FY 2002 Provisional Program Plan September 10, 2001 Submitted to the National Science Foundation Under Cooperative Agreement No. 9613615 NSO MISSION The mission of the National Solar Observatory is to advance knowledge of the Sun, both as an astronomical object and as the dominant external influence on Earth, by providing forefront observational opportunities to the research community. The mission includes the operation of cutting edge facilities, the continued development of advanced instrumentation both in-house and through partnerships, conducting solar research, and educational and public outreach. CONTENTS 1 Introduction 3 New Scientific Capabilities 11 Support to Solar Physics and Principal Investigators 17 Scientific Staff 20 Education and Public Outreach 23 Management and Budget APPENDICES A - I A. Milestones FY 2002 B. Status of FY 2001 Milestones C. FY 2002 Budget Summary D. Scientific Staff Research and Service E. Deferred Maintenance FY 2002 F. FY 2000 Visitor and Telescope Usage Statistics G. NSO Management H. Organizational Charts I. Acronym Glossary NSO Provisional Program Plan FY 2002: Mission Statement INTRODUCTION The NSO continues its multi-year program to renew national ground-based solar observing assets which will play key roles in a vigorous US solar physics program. Major components of the plan include: developing a 4-m Advanced Technology Solar Telescope (ATST) in collaboration with the High Altitude Observatory (HAO) and the university community; developing adaptive optics systems that can fully correct large-aperture solar telescopes; completing and operating the instruments comprising the Synoptic Optical Long-term Investigations of the Sun (SOLIS); operating the Global Oscillation Network Group (GONG) in its new high-resolution mode; and an orderly transition to a new NSO structure, which can efficiently operate these instruments and push the frontiers of solar physics. -
Ground-Based Solar Physics in the Era of Space Astronomy a White Paper Submitted to the 2012 Heliophysics Decadal Survey
Ground-Based Solar Physics in the Era of Space Astronomy A White Paper Submitted to the 2012 Heliophysics Decadal Survey T. Ayres1, D. Longcope2 (on behalf of the 2009 AURA Solar Decadal Committee) Chromosphere-Corona at eclipse Hα filtergram Photospheric spots & bright points Same area in chromospheric Ca+ 1Center for Astrophysics and Space Astronomy, 389 UCB, University of Colorado, Boulder, CO 80309; [email protected] (corresponding author) 2Montana State University SUMMARY. A report, previously commissioned by AURA to support advocacy efforts in advance of the Astro2010 Decadal Survey, reached a series of conclusions concerning the future of ground-based solar physics that are relevant to the counterpart Heliophysics Survey. The main findings: (1) The Advanced Technology Solar Telescope (ATST) will continue U.S. leadership in large aperture, high-resolution ground-based solar observations, and will be a unique and powerful complement to space-borne solar instruments; (2) Full-Sun measurements by existing synoptic facilities, and new initiatives such as the Coronal Solar Magnetism Observatory (COSMO) and the Frequency Agile Solar Radiotelescope (FASR), will balance the narrow field of view captured by ATST, and are essential for the study of transient phenomena; (3) Sustaining, and further developing, synoptic observations is vital as well to helioseismology, solar cycle studies, and Space Weather prediction; (4) Support of advanced instrumentation and seeing compensation techniques for the ATST, and other solar telescopes, is necessary to keep ground-based solar physics at the cutting edge; and (5) Effective planning for ground-based facilities requires consideration of the synergies achieved by coordination with space-based observatories. -
The New Heliophysics Division Template
NASA Heliophysics Division Update Heliophysics Advisory Committee October 1, 2019 Dr. Nicola J. Fox Director, Heliophysics Division Science Mission Directorate 1 The Dawn of a New Era for Heliophysics Heliophysics Division (HPD), in collaboration with its partners, is poised like never before to -- Explore uncharted territory from pockets of intense radiation near Earth, right to the Sun itself, and past the planets into interstellar space. Strategically combine research from a fleet of carefully-selected missions at key locations to better understand our entire space environment. Understand the interaction between Earth weather and space weather – protecting people and spacecraft. Coordinate with other agencies to fulfill its role for the Nation enabling advances in space weather knowledge and technologies Engage the public with research breakthroughs and citizen science Develop the next generation of heliophysicists 2 Decadal Survey 3 Alignment with Decadal Survey Recommendations NASA FY20 Presidential Budget Request R0.0 Complete the current program Extended operations of current operating missions as recommended by the 2017 Senior Review, planning for the next Senior Review Mar/Apr 2020; 3 recently launched and now in primary operations (GOLD, Parker, SET); and 2 missions currently in development (ICON, Solar Orbiter) R1.0 Implement DRIVE (Diversify, Realize, Implemented DRIVE initiative wedge in FY15; DRIVE initiative is now Integrate, Venture, Educate) part of the Heliophysics R&A baseline R2.0 Accelerate and expand Heliophysics Decadal recommendation of every 2-3 years; Explorer mission AO Explorer program released in 2016 and again in 2019. Notional mission cadence will continue to follow Decadal recommendation going forward. Increased frequency of Missions of Opportunity (MO), including rideshares on IMAP and Tech Demo MO. -
NASA Technical Memorandum
N 84- 19786 NASA Technical Memorandum NASA TM - 32568 THE NEW MSFC SOLAR VECTOR MAGNETOGRAPH Center Director's Discretionary Fund Final Report By M. J. Hagyard, E. A. West, N. P. Cumings Space Science Laboratory February 1984 NASA National Aeronautics and Space Administration George C. Marshall Space Flight Center MSFC - Form 3190 (Rev. May 1983) 1. REPORT NO. 2. GOVERNMENT ACCESSION NO. 3. RECIPIENT'S CATALOG NO. NASA TM-82568 4. TITLE AND SUBTITLE 5. REPORT DATE The New MSFC Solar Vector Magnetograph February 1984 Center Director's Discretionary Fund, Final Report 6. PERFORMING ORGANIZATION CODE 7. AUTHOR(S) 8. PERFORMING ORGANIZATION REPORT # M. J. Hagyard, E. A. West, N. P. Cumings 9. PERFORMING ORGANIZATION NAME AND ADDRESS 10. WORK UNIT NO. George C. Marshall Space Flight Center Marshall Space Flight Center, Alabaina 35812 1 1. CONTRACT OR GRANT NO. 13. TYPE OF REPORT & PERIOD COVERED 12. SPONSORING AGENCY NAME AND ADDRESS National Aeronautics and Space Administration Technical Memorandum Washington, D.C., 20546 14. SPONSORING AGENCY CODE 15. SUPPLEMENTARY NOTES Prepared by Space Science Laboratory, Science and Engineering Directorate 16. ABSTRACT The unique MSFC solar vector magnetograph allows measurements of all three components of the Sun's photospheric magnetic field over a wide field-of-view ( « 6x6 arc min) with spatial resolution determined by a 2.7x 2.7 arc second pixel size. Supported by two Center Director's Discretionary Fund Projects, this system has recently undergone extensive modifications to improve its sensitivity and temporal response. The modifications included: replacing an SEC vidicon detector with a solid-state CCD camera; replacing the original digital logic circuitry with an electronic controller and a computer to provide complete, programmable control over the entire operation of the magnetograph; and installing a new polarimeter which consists of a single electro-optical modulator coupled with interchangeable waveplates mounted on a rotating assembly. -
N89- 15859 an Imaging Vector Magnetograph for the Next Solar Maximum
N89- 15859 AN IMAGING VECTOR MAGNETOGRAPH FOR THE NEXT SOLAR MAXIMUM Richard C. Canfield and Donald L. Mickey Institute for Astronomy, University of Hawaii Honolulu, Hawaii 96822 ABSTRACT. Measurements of the vector magnetic field in the sun’s atmo- sphere with high spatial and temporal resolution over a large field of view are critical to understanding the nature and evolu- tion of currents in active regions. Such measurements, when combined with the thermal and nonthermal X-ray images from the upcoming Solar-A mission, will reveal the large-scale rela- tionship between these currents and sites of heating and particle acceleration in flaring coronal magnetic flux tubes. We describe the conceptual design of a new imaging vector magnetograph that combines a modest solar telescope with a rotating quarter-wave plate, an acousto-optical tunable prefilter I as a blocker for a servo-controlled Fabry-Perot etalon, CCD cameras, and a rapid digital tape recorder. Its high spatial reso- lution (1/2 arcsec pixel size) over a large field of view (4 by 5 arcmin) will be sufficient to significantly measure, for the first time, the magnetic energy dissipated in major solar flares. Its millisecond tunability and wide spectral range (5000 - 8000 8) enable nearly simultaneous vector magnetic field measurements in the gas-pressufe-dominated photosphere and magnetically- dominated chromosphere, as well as effective co-alignment with Solar-A’s X-ray images. 81 PERFORMANCE CHARACTERISTICS Spatial resolution: one arcsec. Detector pixel spacing of approximately 0.5 arcsec over a 4 x 5 arcmin field of view. This high resolution will critically sample the high quality image typical at Mees early in the day. -
A Recommendation for a Complete Open Source Policy
A recommendation for a complete open source policy. Authors Steven D. Christe, Research Astrophysicist, NASA Goddard Space Flight Center, SunPy Founder and Board member Jack Ireland, Senior Scientist, ADNET Systems, Inc. / NASA Goddard Space Flight Center, SunPy Board Member Daniel Ryan, NASA Postdoctoral Fellow, NASA Goddard Space Flight Center, SunPy Contributor Supporters SunPy Board ● Monica G. Bobra, Research Scientist, W. W. Hansen Experimental Physics Laboratory, Stanford University ● Russell Hewett, Research Scientist, Unaffiliated ● Stuart Mumford, Research Fellow, The University of Sheffield, SunPy Lead Developer ● David Pérez-Suárez, Senior Research Software Developer, University College London ● Kevin Reardon, Research Scientist, National Solar Observatory ● Sabrina Savage, Research Astrophysicist, NASA Marshall Space Flight Center ● Albert Shih, Research Astrophysicist, NASA Goddard Space Flight Center Joel Allred, Research Astrophysicist, NASA Goddard Space Flight Center Tiago M. D. Pereira, Researcher, Institute of Theoretical Astrophysics, University of Oslo Hakan Önel, Postdoctoral researcher, Leibniz Institute for Astrophysics Potsdam, Germany Michael S. F. Kirk, Research Scientist, Catholic University of America / NASA GSFC The data that drives scientific advances continues to grow ever more complex and varied. Improvements in sensor technology, combined with the availability of inexpensive storage, have led to rapid increases in the amount of data available to scientists in almost every discipline. Solar physics is no exception to this trend. For example, NASAʼs Solar Dynamics Observatory (SDO) spacecraft, launched in February 2010, produces over 1TB of data per day. However, this data volume will soon be eclipsed by new instruments and telescopes such as the Daniel K. Inouye Solar Telescope (DKIST) or the Large Synoptic Survey Telescope (LSST), which are slated to begin taking data in 2020 and 2022, respectively. -
Diagnostic of Spectral Lines in Magnetized Solar Atmosphere
SCIENCE CHINA Physics, Mechanics & Astronomy Print-CrossMark . Article . Vol. No. : doi: Diagnostic of Spectral Lines in Magnetized Solar Atmosphere: Formation of the Hβ Line in Sunspots Hongqi Zhang* Key Laboratory of Solar Activity, National Astronomical Observatories of the Chinese Academy of Sciences, 100101, Beijing China Received ; accepted Formation of the Hβλ4861.34 Å line is an important topic related to the diagnosis of the basic configuration of magnetic fields in the solar and stellar chromospheres. Specifically, broadening of the Hβλ4861.34 Å line occurs due to the magnetic and micro- electric fields in the solar atmosphere. The formation of Hβ in the model umbral atmosphere is presented based on the assumption of non-local thermodynamic equilibrium. It is found that the model umbral chromosphere is transparent to the Stokes parameters of the Hβ line, which implies that the observed signals of magnetic fields at sunspot umbrae via the Hβ line originate from the deep solar atmosphere, where lg τc ≈−1 (about 300 km in the photospheric layer for our calculations). This is in contrast to the observed Stokes signals from non-sunspot areas, which are thought to primarily form in the solar chromosphere. Solar spectrum, Polarization - Stokes parameters, Magnetic fields PACS number(s): Citation: Hongqi Zhang, Formation of Hβ Line in Solar Magnetic Atmospheres, Sci. China-Phys. Mech. Astron. , (), doi: 1 Introduction of Sciences for the measurements of the solar chromospheric magnetic fields (Zhang & Ai, 1987)[5]. Similar magne- With the discovery of the Zeeman effect by P. Zee- tograms were obtained at other observatories, such as Crimea man (1897)[1], scientists can therefore extract informa- and Kitt Peak [6-8]. -
Parker Solar Probe SWG Telecon February 5, 2020 Project Science Report Nour Raouafi Project Status Helene Winters Payload Status SB,JK,DM,RH Solar Orbiter H
Parker Solar Probe SWG Telecon February 5, 2020 Project Science Report Nour Raouafi Project Status Helene Winters Payload Status SB,JK,DM,RH Solar Orbiter H. Gilbert/C. St. Cyr SOC Activities Martha Kusterer Payload SE Telecon S. Hamilton/A. Reiter Theory Group M. Velli/A. Higginson Upcoming Meetings Nour Raouafi Science Presentations: DaviD Malaspina (LASP) & Karl Battams (NRL) Agenda • DCP 5 Information • DCP Type: Data Volume • Venus Flyby • Non-routine Activities & Science Priorities o WISPR o ISOIS o FIELDS o SWEAP • Modeling – Robert Allen • Coordinated observations. Parker Solar Probe Project Science SWG Telecon February 5, 2020 ApJS Special Issue (ApJ/SI) 50+ papers submitted as of Oct. 20, 2019 Early Results from Parker Solar Probe: Ushering a New Frontier in Space Exploration • Publication Date: February 3, 2020 • 48 papers accessible online • Few more papers still under review Corresponding authors: please speed up the reviewing process – Send me your submission info and the manuscript. • Print copies: Science Teams are you interested in ordering print copies of the special issue? 2/7/20 4 Nature Papers ADS not listing all the authors • ADS lists only three authors: the first two and the last one • The issue was addressed for the FIELDS and WISPR papers • But not for the SWEAP and ISOIS papers • ADS stated that that’s the information Nature sent to them • Corrections can submitted through http://adsabs.harvard.edu/adsfeedback/submit_abstract.php. 2/7/20 5 Future Publications • Let’s us know about your results in case we need to prepare for press releases • Animations take time to design and get ready • Please do not for the mission acknowledgements Parker Solar Probe was designed, built, and is now operated by the Johns Hopkins Applied Physics Laboratory as part of NASA’s Living with a Star (LWS) program (contract NNN06AA01C). -
Sdo Sdt Report.Pdf
Solar Dynamics Observatory “…to understand the nature and source of the solar variations that affect life and society.” Report of the Science Definition Team Solar Dynamics Observatory Science Definition Team David Hathaway John W. Harvey K. D. Leka Chairman National Solar Observatory Colorado Research Division Code SD50 P.O. Box 26732 Northwest Research Assoc. NASA/MSFC Tucson, AZ 85726 3380 Mitchell Lane Huntsville, AL 35812 Boulder, CO 80301 Spiro Antiochos Donald M. Hassler David Rust Code 7675 Southwest Research Institute Applied Physics Laboratory Naval Research Laboratory 1050 Walnut St., Suite 426 Johns Hopkins University Washington, DC 20375 Boulder, Colorado 80302 Laurel, MD 20723 Thomas Bogdan J. Todd Hoeksema Philip Scherrer High Altitude Observatory Code S HEPL Annex B211 P. O. Box 3000 NASA/Headquarters Stanford University Boulder, CO 80307 Washington, DC 20546 Stanford, CA 94305 Joseph Davila Jeffrey Kuhn Rainer Schwenn Code 682 Institute for Astronomy Max-Planck-Institut für Aeronomie NASA/GSFC University of Hawaii Max Planck Str. 2 Greenbelt, MD 20771 2680 Woodlawn Drive Katlenburg-Lindau Honolulu, HI 96822 D37191 GERMANY Kenneth Dere Barry LaBonte Leonard Strachan Code 4163 Institute for Astronomy Harvard-Smithsonian Naval Research Laboratory University of Hawaii Center for Astrophysics Washington, DC 20375 2680 Woodlawn Drive 60 Garden Street Honolulu, HI 96822 Cambridge, MA 02138 Bernhard Fleck Judith Lean Alan Title ESA Space Science Dept. Code 7673L Lockheed Martin Corp. c/o NASA/GSFC Naval Research Laboratory 3251 Hanover Street Code 682.3 Washington, DC 20375 Palo Alto, CA 94304 Greenbelt, MD 20771 Richard Harrison John Leibacher Roger Ulrich CCLRC National Solar Observatory Department of Astronomy Chilton, Didcot P.O. -
The High Energy Telescope for STEREO
Space Sci Rev (2008) 136: 391–435 DOI 10.1007/s11214-007-9300-5 The High Energy Telescope for STEREO T.T. von Rosenvinge · D.V. Reames · R. Baker · J. Hawk · J.T. Nolan · L. Ryan · S. Shuman · K.A. Wortman · R.A. Mewaldt · A.C. Cummings · W.R. Cook · A.W. Labrador · R.A. Leske · M.E. Wiedenbeck Received: 1 May 2007 / Accepted: 18 December 2007 / Published online: 14 February 2008 © Springer Science+Business Media B.V. 2008 Abstract The IMPACT investigation for the STEREO Mission includes a complement of Solar Energetic Particle instruments on each of the two STEREO spacecraft. Of these in- struments, the High Energy Telescopes (HETs) provide the highest energy measurements. This paper describes the HETs in detail, including the scientific objectives, the sensors, the overall mechanical and electrical design, and the on-board software. The HETs are designed to measure the abundances and energy spectra of electrons, protons, He, and heavier nuclei up to Fe in interplanetary space. For protons and He that stop in the HET, the kinetic energy range corresponds to ∼13 to 40 MeV/n. Protons that do not stop in the telescope (referred to as penetrating protons) are measured up to ∼100 MeV/n, as are penetrating He. For stop- ping He, the individual isotopes 3He and 4He can be distinguished. Stopping electrons are measured in the energy range ∼0.7–6 MeV. Keywords Space instrumentation · STEREO mission · Energetic particles · Coronal mass ejections · Particle acceleration PACS 96.50.Pw · 96.50.Vg · 96.60.ph Abbreviations 2-D Two dimensional ACE Advanced Composition Explorer ACRs Anomalous Cosmic Rays ADC Analog to Digital Converter T.T.