What Erodes the Plasmasphere So Severely?
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Peace in Vietnam! Beheiren: Transnational Activism and Gi Movement in Postwar Japan 1965-1974
PEACE IN VIETNAM! BEHEIREN: TRANSNATIONAL ACTIVISM AND GI MOVEMENT IN POSTWAR JAPAN 1965-1974 A DISSERTATION SUBMITTED TO THE GRADUATE DIVISION OF THE UNIVERSITY OF HAWAI‘I AT MĀNOA IN PARTIAL FULFILLMENT OF THE REQUIREMENT FOR THE DEGREE OF DOCTOR OF PHILOSOPHY IN POLITICAL SCIENCE AUGUST 2018 By Noriko Shiratori Dissertation Committee: Ehito Kimura, Chairperson James Dator Manfred Steger Maya Soetoro-Ng Patricia Steinhoff Keywords: Beheiren, transnational activism, anti-Vietnam War movement, deserter, GI movement, postwar Japan DEDICATION To my late father, Yasuo Shiratori Born and raised in Nihonbashi, the heart of Tokyo, I have unforgettable scenes that are deeply branded in my heart. In every alley of Ueno station, one of the main train stations in Tokyo, there were always groups of former war prisoners held in Siberia, still wearing their tattered uniforms and playing accordion, chanting, and panhandling. Many of them had lost their limbs and eyes and made a horrifying, yet curious, spectacle. As a little child, I could not help but ask my father “Who are they?” That was the beginning of a long dialogue about war between the two of us. That image has remained deep in my heart up to this day with the sorrowful sound of accordions. My father had just started work at an electrical laboratory at the University of Tokyo when he found he had been drafted into the imperial military and would be sent to China to work on electrical communications. He was 21 years old. His most trusted professor held a secret meeting in the basement of the university with the newest crop of drafted young men and told them, “Japan is engaging in an impossible war that we will never win. -
Sun-Earth System Interaction Studies Over Vietnam: an International Cooperative Project
Ann. Geophys., 24, 3313–3327, 2006 www.ann-geophys.net/24/3313/2006/ Annales © European Geosciences Union 2006 Geophysicae Sun-Earth System Interaction studies over Vietnam: an international cooperative project C. Amory-Mazaudier1, M. Le Huy2, Y. Cohen3, V. Doumbia4,*, A. Bourdillon5, R. Fleury6, B. Fontaine7, C. Ha Duyen2, A. Kobea4, P. Laroche8, P. Lassudrie-Duchesne6, H. Le Viet2, T. Le Truong2, H. Luu Viet2, M. Menvielle1, T. Nguyen Chien2, A. Nguyen Xuan2, F. Ouattara9, M. Petitdidier1, H. Pham Thi Thu2, T. Pham Xuan2, N. Philippon**, L. Tran Thi2, H. Vu Thien10, and P. Vila1 1CETP/CNRS, 4 Avenue de Neptune, 94107 Saint-Maur-des-Fosses,´ France 2Institute of Geophysics, Vietnamese Academy of Science and Technology , 18 Hoang Quoc Viet, Cau Giay, Hano¨ı, Vietnam 3IPGP, 4 Avenue de Neptune, 94107 Saint-Maur-des-Fosses,´ France 4Laboratoire de Physique de l’Atmosphere,` Universite´ d’Abidjan Cocody 22 B.P. 582, Abidjan 22, Coteˆ d’Ivoire 5Institut d’Electronique et de Tel´ ecommunications,´ Universite´ de Rennes Batˆ 11D, Campus Beaulieu, 35042 Rennes, cedex,´ France 6ENST, Universite´ de Bretagne Occidentale, CS 83818, 29288 Brest, cedex´ 3, France 7CRC , Faculte´ des Sciences, 6 Boulevard Gabriel, F 21004 Dijon cedex´ 04, France 8Unite´ de Recherche Environnement Atmospherique,´ ONERA, 92332 Chatillon, cedex,´ France 9University of Koudougou, Burkina Faso 10Laboratoire signaux et systemes,` CNAM, 292 Rue saint Martin, 75141 Paris cedex´ 03, France *V. Doumbia previously signed V. Doumouya **affiliation unknown Received: 15 June 2006 – Revised: 19 October 2006 – Accepted: 8 November 2006 – Published: 21 December 2006 Abstract. During many past decades, scientists from var- the E, F1 and F2 ionospheric layers follow the variation of ious countries have studied separately the atmospheric mo- the sunspot cycle. -
1 the Mass Spectrum Analyzer (MSA) for the Martian Moons Explorat
In Situ Observations of Ions and Magnetic Field Around Phobos: The Mass Spectrum Analyzer (MSA) for the Martian Moons eXploration (MMX) Mission Shoichiro Yokota ( [email protected] ) Osaka Univ. https://orcid.org/0000-0001-8851-9146 Naoki Terada Tohoku University Ayako Matsuoka Kyoto University: Kyoto Daigaku Naofumi Murata JAXA Yoshifumi Saito ISAS/JAXA Dominique Delcourt LPP-CNRS-Sorbonne Yoshifumi Futaana Swedish Institute of Space Physics Kanako Seki The University of Tokyo: Tokyo Daigaku Micah J Schaible Georgia Institute of Technology Kazushi Asamura ISAS/JAXA Satoshi Kasahara The University of Tokyo: Tokyo Daigaku Hiromu Nakagawa Tohoku University: Tohoku Daigaku Masaki N Nishino ISAS/JAXA Reiko Nomura ISAS/JAXA Kunihiro Keika The University of Tokyo: Tokyo Daigaku Yuki Harada Kyoto University: Kyoto Daigaku Shun Imajo Nagoya University: Nagoya Daigaku Full paper Keywords: Martian Moons eXploration (MMX), Phobos, Mars, mass spectrum analyzer, magnetometer Posted Date: December 21st, 2020 DOI: https://doi.org/10.21203/rs.3.rs-130696/v1 License: This work is licensed under a Creative Commons Attribution 4.0 International License. Read Full License 1 In situ observations of ions and magnetic field around Phobos: 2 The Mass Spectrum Analyzer (MSA) for the Martian Moons eXploration (MMX) 3 mission 4 Shoichiro Yokota1, Naoki Terada2, Ayako Matsuoka3, Naofumi Murata4, Yoshifumi 5 Saito5, Dominique Delcourt6, Yoshifumi Futaana7, Kanako Seki8, Micah J. Schaible9, 6 Kazushi Asamura5, Satoshi Kasahara8, Hiromu Nakagawa2, Masaki -
Message from the Director General September 2017 Saku Tsuneta Director General
Message from the Director General September 2017 Saku Tsuneta Director General Institute of Space and Astronautical Science Japan Aerospace Exploration Agency On April 28, 2016, the Japan former ISAS project managers, and levels, the satellite was declared to Aerospace Exploration Agency an Action Plan for Reforming ISAS have entered into its scheduled orbit (JAXA) made the difficult decision Based on the Anomaly Experienced in March 2017. The successful start to terminate attempts to restore by Hitomi was developed. In of the ARASE mission is a testament communication with the X-ray addition, “town hall meetings” were to the dedication and skills across Astronomy Satellite ASTRO-H (also held to share the spirit and practice JAXA. known as HITOMI), which was of the action plan with all ISAS ISAS is currently operating six launched on February 17, 2016, due employees. The plan, which was satellites and space probes: ARASE, to the communication anomalies applied to launch preparations of Hayabusa2, HISAKI, AKATSUKI, that occurred on March 26, 2016. the geospace exploration satellite HINODE, and GEOTAIL. Asteroid Since that time, in consultation with ARASE, contributed to the successful Explorer Hayabusa2, which is experts inside as well as outside and stable operation of that satellite, currently on its planned trajectory JAXA, the Institute of Space and and will be applied to other projects towards the 162173 Ryugu asteroid Astronautical Science (ISAS) has such as the Smart Lander for under ion engine power, is equipped been making every possible effort Investigating Moon (SLIM). The plan- with new technologies for solar to determine what went wrong, and do-check-act (PDCA) cycle should system exploration such as long- what can be done to prevent this work to further refine both current distance communication using Ka- from happening again in the future. -
Plasmasphere Last Time We Started Talking About
Plasmasphere Last time we started talking about: Why does the plasmashere corotate? Review hot, cold drifts Discuss Alfven Shielding Layer Put it all together Then introduce Ionosphere subjects Plasma density 100 or 1000 times higher than outer magnetosphere Field Aligned Currents Region 1 (inner) Region 2 (outer) Ijima&Potemera Now, lets put it together • How do we explain Region 1 and Region 2 field aligned currents? • Region 1 is driven by magnetopause charge separation • Region 2 is driven by partial ring current • Next: what about aurora? Partial Ring Current: energetic particles Grad- B drift but don’t make it all the way around the earth Equatorial Plane View Plasmasphere corotates with Earth once a day Equatorial Plane View Plasmasphere corotates with Earth once a day Magnetic activity index Very High Density Moving from magnetosphere to ionosphere • Field aligned currents • Ionosphere structure • Ionosphere currents, What is σ? – 1. below 85 km altitude σ is isotropic – 2. 85 to 150 km (D and E regions) σ is tensor – 3. above 150 km σ is just σ|| • Then: put it all together Three views of ionosphere structure • Electron density • Thermal structure • Ion density and source Free electrons e- Negative ions Ionsopheric currents • J = σ E Ohms Law • We know there are large scale E fields (why), so what is σ in the ionosphere? What is Conductivity? • The scalar conductivity σ is defined as the ratio of the current density to the electric field strength σ = J/E. For a resistive medium this is just the Spitzer conductivity: • To get the components look at • So, σ can have many components: (Another way to derive scalar conductivity) Conductivity when particles gyrate σ becomes a matrix . -
Planet Earth Taken by Hayabusa-2
Space Science in JAXA Planet Earth May 15, 2017 taken by Hayabusa-2 Saku Tsuneta, PhD JAXA Vice President Director General, Institute of Space and Astronautical Science 2017 IAA Planetary Defense Conference, May 15-19,1 Tokyo 1 Brief Introduction of Space Science in JAXA Introduction of ISAS and JAXA • As a national center of space science & engineering research, ISAS carries out development and in-orbit operation of space science missions with other directorates of JAXA. • ISAS is an integral part of JAXA, and has close collaboration with other directorates such as Research and Development and Human Spaceflight Technology Directorates. • As an inter-university research institute, these activities are intimately carried out with universities and research institutes inside and outside Japan. ISAS always seeks for international collaboration. • Space science missions are proposed by researchers, and incubated by ISAS. ISAS plays a strategic role for mission selection primarily based on the bottom-up process, considering strategy of JAXA and national space policy. 3 JAXA recent science missions HAYABUSA 2003-2010 AKARI(ASTRO-F)2006-2011 KAGUYA(SELENE)2007-2009 Asteroid Explorer Infrared Astronomy Lunar Exploration IKAROS 2010 HAYABUSA2 2014-2020 M-V Rocket Asteroid Explorer Solar Sail SUZAKU(ASTRO-E2)2005- AKATSUKI 2010- X-Ray Astronomy Venus Meteorogy ARASE 2016- HINODE(SOLAR-B)2006- Van Allen belt Solar Observation Hisaki 2013 4 Planetary atmosphere Close ties between space science and space technology Space Technology Divisions Space -
Theory, Modeling, and Integrated Studies in the Arase (ERG) Project
Seki et al. Earth, Planets and Space (2018) 70:17 https://doi.org/10.1186/s40623-018-0785-9 FULL PAPER Open Access Theory, modeling, and integrated studies in the Arase (ERG) project Kanako Seki1* , Yoshizumi Miyoshi2, Yusuke Ebihara3, Yuto Katoh4, Takanobu Amano1, Shinji Saito5, Masafumi Shoji2, Aoi Nakamizo6, Kunihiro Keika1, Tomoaki Hori2, Shin’ya Nakano7, Shigeto Watanabe8, Kei Kamiya5, Naoko Takahashi1, Yoshiharu Omura3, Masahito Nose9, Mei‑Ching Fok10, Takashi Tanaka11, Akimasa Ieda2 and Akimasa Yoshikawa11 Abstract Understanding of underlying mechanisms of drastic variations of the near-Earth space (geospace) is one of the current focuses of the magnetospheric physics. The science target of the geospace research project Exploration of energiza‑ tion and Radiation in Geospace (ERG) is to understand the geospace variations with a focus on the relativistic electron acceleration and loss processes. In order to achieve the goal, the ERG project consists of the three parts: the Arase (ERG) satellite, ground-based observations, and theory/modeling/integrated studies. The role of theory/modeling/integrated studies part is to promote relevant theoretical and simulation studies as well as integrated data analysis to combine diferent kinds of observations and modeling. Here we provide technical reports on simulation and empirical models related to the ERG project together with their roles in the integrated studies of dynamic geospace variations. The simu‑ lation and empirical models covered include the radial difusion model of the radiation belt electrons, GEMSIS-RB and RBW models, CIMI model with global MHD simulation REPPU, GEMSIS-RC model, plasmasphere thermosphere model, self-consistent wave–particle interaction simulations (electron hybrid code and ion hybrid code), the ionospheric electric potential (GEMSIS-POT) model, and SuperDARN electric feld models with data assimilation. -
Securing Japan an Assessment of Japan´S Strategy for Space
Full Report Securing Japan An assessment of Japan´s strategy for space Report: Title: “ESPI Report 74 - Securing Japan - Full Report” Published: July 2020 ISSN: 2218-0931 (print) • 2076-6688 (online) Editor and publisher: European Space Policy Institute (ESPI) Schwarzenbergplatz 6 • 1030 Vienna • Austria Phone: +43 1 718 11 18 -0 E-Mail: [email protected] Website: www.espi.or.at Rights reserved - No part of this report may be reproduced or transmitted in any form or for any purpose without permission from ESPI. Citations and extracts to be published by other means are subject to mentioning “ESPI Report 74 - Securing Japan - Full Report, July 2020. All rights reserved” and sample transmission to ESPI before publishing. ESPI is not responsible for any losses, injury or damage caused to any person or property (including under contract, by negligence, product liability or otherwise) whether they may be direct or indirect, special, incidental or consequential, resulting from the information contained in this publication. Design: copylot.at Cover page picture credit: European Space Agency (ESA) TABLE OF CONTENT 1 INTRODUCTION ............................................................................................................................. 1 1.1 Background and rationales ............................................................................................................. 1 1.2 Objectives of the Study ................................................................................................................... 2 1.3 Methodology -
Overview of Micro/Nano/Pico-Satellite Part 1 Shinichi Nakasuka University of Tokyo
CanSat & Rocket Experiment(‘99~) Hodoyoshiハイブリッド-1 ‘14 ロケット Overview of Micro/nano/pico-satellite Part 1 Shinichi Nakasuka University of Tokyo PRISM ‘09 CubeSat 03,05 Nano-JASMINE (TBD) Where is Our University ? • University of Tokyo: 28,000 students, 7800 staffs – School of Engineering: 22 departments • Intelligent Space Systems Laboratory University of Tokyo in Tokyo Metropolitan Robot Statistics about University of Tokyo • The University of Tokyo – Established in 1886 – 11 Faculties/Graduate Schools – 14000 undergraduate/14000 graduate students – 3900 academic staffs/ 3900 supporting staffs – World QS ranking: 23th • School of Engineering – 1050 undergraduate students/year – 2053 master student/1066 Ph.D candidate • Including 921 foreign students from 74 countries – 453 academic staffs/ 206 supporting staffs – Yearly budget: about $ 250M – World QS ranking: 8th • Mechanical/Aerospace: 9th ranking Graduate School of Engineering 18 Departments, 2 Institutes, 7 Centers ◆ Civil Engineering ◆ Materials Engineering ◆ Architecture ◆ Applied Chemistry ◆ Urban Engineering *3 ◆ Chemical System Engineering ◆ Mechanical Engineering ◆ Chemistry and Biotechnology ◆ Aeronautics and Astronautics ◆ Advanced Interdisciplinary Studies *1 ◆ Precision Engineering ◆ Nuclear Engineering and Management ◆ Electrical Engineering and Information Systems ◆ Bioengineering ◆ Applied Physics ◆ Technology Management for Innovation ◆ Systems Innovation ◆ Nuclear Professional School *2 Institute of Engineering Innovation *1 Doctoral course only Institute of Innovation -
THEMIS ESA First Science Results and Performance Issues
Space Sci Rev DOI 10.1007/s11214-008-9433-1 THEMIS ESA First Science Results and Performance Issues J.P. McFadden · C.W. Carlson · D. Larson · J. Bonnell · F. Mozer · V. Angelopoulos · K.-H. Glassmeier · U. Auster Received: 5 April 2008 / Accepted: 25 August 2008 © Springer Science+Business Media B.V. 2008 Abstract Early observations by the THEMIS ESA plasma instrument have revealed new details of the dayside magnetosphere. As an introduction to THEMIS plasma data, this pa- per presents observations of plasmaspheric plumes, ionospheric ion outflows, field line reso- nances, structure at the low latitude boundary layer, flux transfer events at the magnetopause, and wave and particle interactions at the bow shock. These observations demonstrate the ca- pabilities of the plasma sensors and the synergy of its measurements with the other THEMIS experiments. In addition, the paper includes discussions of various performance issues with the ESA instrument such as sources of sensor background, measurement limitations, and data formatting problems. These initial results demonstrate successful achievement of all measurement objectives for the plasma instrument. Keywords THEMIS · Magnetosphere · Magnetopause · Bow shock · Instrument performance PACS 94.80.+g · 06.20.Fb · 94.30.C- · 94.05.-a · 07.87.+v 1 Introduction The THEMIS mission provides the first multi-satellite measurements of the dayside mag- netosphere, magnetopause and bow shock utilizing a string of pearls orbit near the ecliptic plane (Angelopoulos 2008). During a 7 month coast phase, the instruments were commis- sioned and cross-calibrated while spacecraft separations were adjusted from a few hundred J.P. McFadden () · C.W. Carlson · D. -
Effects of the Radiation Belt on the Plasmasphere Distribution
Utah State University DigitalCommons@USU All Graduate Theses and Dissertations Graduate Studies 12-2020 Effects of the Radiation Belt on the Plasmasphere Distribution Stefan Thonnard Utah State University Follow this and additional works at: https://digitalcommons.usu.edu/etd Part of the Plasma and Beam Physics Commons Recommended Citation Thonnard, Stefan, "Effects of the Radiation Belt on the Plasmasphere Distribution" (2020). All Graduate Theses and Dissertations. 8007. https://digitalcommons.usu.edu/etd/8007 This Dissertation is brought to you for free and open access by the Graduate Studies at DigitalCommons@USU. It has been accepted for inclusion in All Graduate Theses and Dissertations by an authorized administrator of DigitalCommons@USU. For more information, please contact [email protected]. EFFECTS OF THE RADIATION BELT ON THE PLASMASPHERE DISTRIBUTION by Stefan Thonnard A dissertation submitted in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY in Physics Approved: ______________________ ______________________ Robert Schunk, Ph.D. Eric Held, Ph.D. Major Professor Committee Member ______________________ ______________________ Bela Fejer, Ph.D. Charles Swenson, Ph.D. Committee Member Committee Member ______________________ ______________________ Mike Taylor, Ph.D. D. Richard Cutler, Ph.D. Committee Member Interim Vice Provost of Graduate Studies UTAH STATE UNIVERSITY Logan, Utah 2020 ii Copyright © Stefan Thonnard 2020 All Rights Reserved iii ABSTRACT Effects of the Radiation Belt on the Plasmasphere Distribution by Stefan Thonnard, Doctor of Philosophy Utah State University, 2020 Major Professor: Dr. Robert Schunk Department: Physics This study examines the distribution of plasmasphere ions in the presence of warmer radiation belt particles. Recent satellite observations of the radiation belts indicate the existence of a population of warm ions with energy 100 keV to 1 MeV trapped along magnetic field lines. -
Locations of Chorus Emissions Observed by the Polar Plasma Wave Instrument K
JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 115, A00F12, doi:10.1029/2009JA014579, 2010 Click Here for Full Article Locations of chorus emissions observed by the Polar Plasma Wave Instrument K. Sigsbee,1 J. D. Menietti,1 O. Santolík,2,3 and J. S. Pickett1 Received 18 June 2009; revised 20 November 2009; accepted 17 December 2009; published 8 June 2010. [1] We performed a statistical study of the locations of chorus emissions observed by the Polar spacecraft’s Plasma Wave Instrument (PWI) from March 1996 to September 1997, near the minimum of solar cycles 22/23. We examined how the occurrence of chorus emissions in the Polar PWI data set depends upon magnetic local time, magnetic latitude, L shell, and L*. The Polar PWI observed chorus most often over a range of magnetic local times extending from about 2100 MLT around to the dawn flank and into the dayside magnetosphere near 1500 MLT. Chorus was least likely to be observed near the dusk flank. On the dayside, near noon, the region in which Polar observed chorus extended to larger radial distances and higher latitudes than at other local times. Away from noon, the regions in which chorus occurred were more restricted in both radial and latitudinal extent. We found that for high‐latitude chorus near local noon, L* provides a more reasonable mapping to the equatorial plane than the standard L shell. Chorus was observed slightly more often when the magnitude of the solar wind magnetic field BSW was greater than 5 nT than it was for smaller interplanetary magnetic field strengths.