Name: Catherine L. Johnson PLANETARY SCIENCE INSTITUTE

Name: Catherine L. Johnson

PLANETARY SCIENCE INSTITUTE INDIVIDUAL ANNUAL REPORT Calendar Year 2016

I. Research Summary

My research over the past year has focused primarily on geophysical investigations of Mercury, Mars’ magnetic field (with current student Mittelholz), development of altimetry and gravity analysis and processing tools in preparation for the OSIRIS REx mission (with research associates Philpott and Al Asad), as well as some lunar magnetic field work (with postdoc K. Lawrence). All of my 2016 peer-reviewed publications reflect my work on Mercury – an invited review for the JGR Planets 25th anniversary issue, a first author paper in GRL and a paper motivated by my Science paper on crustal fields on Mercury,led by a student at the U. of Minnesota. The submitted paper is first-authored by my former PhD student (now a postdoc at the University of New Hampshire), and on which my research associate, L. Philpott, is second author reflecting her substantial contributions. I also have an invited book chapter on Mercury’s internal magnetic field for a book to be published by Cambridge University Press highlighting the discoveries enabled by the MESSENGER mission.

Some of my research is done in collaboration with students at the University of British Columbia, Vancouver where I also hold a position. In 2016 these were • PhD student Anna Mittelholz • PhD student Natasha Urbancic • MSc student Georgia Peterson • MSc student Megan Russell These students were supported by scholarships to the students themselves. I also have two research associates: Lydia Philpott and Manar Al Asad who are working on Mercury’s magnetic field and on the OSIRIS REx mission. S. Mast, an undergraduate student in engineering in Belgium, did a summer research project with me in July/Aug, looking at the magnetic field signatures of craters on Mercury.

My research in 2016 was supported by no-cost extensions on my MESSENGER Participating Scientist award and on a NASA PGG award to me that also provides partial support for PSI postdoc Kristin Lawrence, a subcontract (from UCLA) for magnetic field analyses in preparation for the InSight mission and a subcontract from Johns Hopkins University / Applied Physics Lab to support MESSENGER leadership activities (e.g. preparation of book chapters, final PDS data delivery etc). I am also a Co-I on the InSight Discovery Mission and the OSIRIS-REx New Frontiers Mission.

II. Publications

Published or In Press (bold indicates PSI author; ital. indicates my student, postdoc or research assistant)

1. Johnson, C. L. and S. A. Hauck, II, A whole new Mercury: MESSENGER reveals a dynamic planet at the last frontier of the inner solar system (2016). J. Geophys. Res.: Planets, 121, 2349–2362, doi:10.1002/2016JE005150.

2. Johnson, C. L., L. C. Philpott, B. J. Anderson, S. A. Hauck II, D. Heyner, H. Korth, R. J. Phillips, R. M. Winslow and S. C. Solomon (2016). MESSENGER Observations of Induced Magnetic Fields in Mercury’s Core, Geophys. Res. Lett., vol. 43, no. 6, pp. 2436–2444, 2016. doi: 10.1002/2015GL067370

3. Strauss, B. E., J. M. Feinberg, and C. L. Johnson (2016). Magnetic mineralogy of the Mercurian lithosphere, J. Geophys. Res. Planets, 121, 2225–2238, doi:10.1002/2016JE005054.

4. Susorney H. C. M., O. S. Barnouin, C. M. Ernst and C. L. Johnson (2016), Morphometry of Impact Craters on Mercury from MESSENGER Altimetry and Imaging, Icarus, vol. 271, pp. 180 –193, doi: http: //dx.doi.org/10.1016/j.icarus.2016.01.022.

5. Johnson, C. L., B. J. Anderson, H. Korth, R. J. Phillips and L. C. Philpott, Mercury’s Internal Magnetic Field, Chapter 5, Mercury from MESSENGER, Cambridge University Press, in press, 2016.

Papers Submitted (bold indicates PSI authors; underline indicates my student or postdoc;)

1. Winslow, R. M., L. Philpott, C. Paty, N. Lugaz, N. Schwadron, C. L. Johnson and H. Korth, Statistical study of ICME effects on Mercury’s magnetospheric boundaries and northern cusp region from MESSENGER, submitted to J. Geophys. Res., Space Physics, October 2016.

Abstracts

1. Johnson, C. L., R. J. Phillips, L. C. Philpott, B. J. Anderson, P. K. Byrne, B. W. Denevi, K. Fan, J. M. Feinberg, S. A. Hauck, II, J. W. Head III, H. Korth, E. Mazarico, G. A. Neumann, M. E. Purucker, B. M. Strauss and S. C. Solomon Mercury’s lithospheric magnetic field, In Lunar and Planetary Science XXXXVII, Abstract # 1391, Lunar and Planetary Institute Houston, 2016. 2. Mittelholz, A. and C. L. Johnson, Global external fields at Mars measured at satellite altitudes: preparation for magnetic sounding of the martian interior, In Lunar and Planetary Science XXXXVII, Abstract # 1534, Lunar and Planetary Institute Houston, 2016. 3. Urbancic, N., R. Ghent, S. Stanley, C. L. Johnson, K. A. Carroll, D. Hatch, M. C. Williamson, W. B. Garry and M. Talwani, Determining the 3D subsurface density structure of Taurus Littrow Valley using Apollo 17 gravity data, In Lunar and Planetary Science XXXXVII, Abstract # 1790, Lunar and Planetary Institute Houston, 2016. 4. Anderson, B. J., H. Korth, C. L. Johnson, R. J. Phillips, L. C. Philpott and S. C. Solomon, Closure of Birkeland currents at Mercury: Constraints on the electrical conductivity of the curst and mantle, In Lunar and Planetary Science XXXXVII, Abstract # 1243, Lunar and Planetary Institute Houston, 2016. 5. Perry, M. E., G. A. Neumann, C. L. Johnson, R. J. Phillips, C. M. Ernst, S. C. Solomon, J.-L. Margot, J. Oberst, S. A. Hauck II, M. T. Zuber and D. E. Smith, Radio frequency occultations and the low-degree shape of Mercury, In Lunar and Planetary Science XXXXVII, Abstract # 2549, Lunar and Planetary Institute Houston, 2016. 6. Watters, T. R., R. C. Weber, G. C. Collins and C. L. Johnson, The current stress state of the Moon: Implications for lunar seismic activity, In Lunar and Planetary Science XXXXVII, Abstract # 1642, Lunar and Planetary Institute Houston, 2016. 7. Mittelholz, A. and C. L. Johnson, Crustal Magnetic Fields on Mars from MAVEN data, Abstract GP13A-02, presented at 2016 Fall Meeting, American Geophysical Union, San Francisco, Calif., 12-16 December 2016. 8. Peterson, G., C. L. Johnson, P. K. Byrne, R. J. Phillips and G. A. Neumann, Depth of Faulting in Mercury’s Northern Hemisphere from Lobate Scarp Morphology, P13B- 1940, presented at 2016 Fall Meeting, American Geophysical Union, San Francisco, Calif., 12-16 December 2016. 9. Urbancic, N., R. R. Ghent, C. L. Johnson, S. Stanley, D. Hatch, K. A. Carroll, M.-C. Williamson, W. B. Garry and M. Talwani, Subsurface Density Structure of Taurus Littrow Valley Using Apollo 17 Gravity Data, GP33A-08, presented at 2016 Fall Meeting, American Geophysical Union, San Francisco, Calif., 12-16 December 2016. 10. Winslow, R. M., C. Paty*, L. Philpott, N. Lugaz, N. Schwadron, C. L. Johnson and H. Korth, Statistical study of ICME effects on Mercury’s magnetospheric boundaries and northern cusp region, SM53B-04, presented at 2016 Fall Meeting, American Geophysical Union, San Francisco, Calif., 12-16 December 2016.

* presenting author

III. Awards, Honors

Elected President-Elect of the Geomagnetism, Paleomagnetism and Electromagnetism section of AGU. Term begins January 2017.

IV. Service to the Science Community

1. Co-Organizer, Chapman Conference, Currents in Geospace (May 2016, Dubrovnik).

2. Committee Member, Fellows Committee, Geomagnetism, Paleomagnetism and Electromagnetism Section, American Geophysical Union

3. Committee Member, Name Change for AGU’s Geomagnetism and Paleomagnetism (GP) section to Geomagnetism, Paleomagnetism and Electromagnetism (GPE) section. 4. Committee Member, Fleming Medal Committee, American Geophysical Union 5. Chair, Magnetics Working Group, InSight Mission Science Team.

6. Manuscript reviews: Earth and Planetary Science Letters, Icarus, Journal of Geophysical Research-Planets

7. Proposal reviews: NASA Planetary Geology and Geophysics Program, NSF Geophysics

8. Chair, Pacific Museum of the Earth, University of British Columbia

V. Teaching Activities/Public Lectures

Invited Talks and Seminars: 1. Why Launch a big rocket to go visit a rubble pile? The OSIRIS REx mission to asteroid Bennu, Dept. of Atmospheric and Planetary Science, Hampton University / National Institute of Aerospace, Sept. 2016.

2. The InSight Mission to Mars, Royal Astronomical Society of Canada, Vancouver, Jan. 2016.

3. The InSight Mission: Journey to the Center of Mars, Royal Astronomical Society of Canada, Sunshine Coast, April. 2016.

4. OSIRIS REx: An Asteroid Sample Return Mission, Royal Astronomical Society of Canada, Vancouver, Nov. 2016.

5. OSIRIS REx: An Asteroid Sample Return Mission, Royal Astronomical Society of Canada, Vancouver, Nov. 2016.

6. Mission to Asteroid Bennu, Nerd Night, Vancouver, Nov., 2016. (Fun pictures here: http://lindsaysdiet.com/photos/nerd-nite-20161122/).

Teaching at UBC, Vancouver. EOSC 211, Fall 2016: Computer Methods in Earth, Ocean and Atmospheric Sciences. MATLAB course for second year majors and honors students in our dept (EOAS). Enrollment: 72 Teaching contact hours/wk: 7 (3 lecture plus two 2-hr lab sections), 13 wks. Co-taught 50% although this means either 4 contact hrs/wk (lab only) during times when “not teaching” or 7 contact hrs/wk when “teaching” (lab+lecture) EOSC 450, Fall 2016: Potential Methods in Geophysics Fourth year undergrad / intro grad course in gravity and magnetism for geophysics honors and majors students Enrollment: 11 Contact hours/wk: 4 (3 lecture + 1 office hours), 13 wks. Taught 100% EOSC 448D, Fall 2016: Introduction to Global Geophysics Third year undergrad / course in global geophysics” primarily geophysics honors and majors students. New course introduced by me in Fall 2016. Enrollment: 11 Contact hours/wk: 4 (3 lecture + 1 office hours), 13 wks. Taught 100%

Mentoring: K. Lawrence, postdoc (PSI); Anna Mittelholz (PhD student, UBC), Georgia Peterson (MSc student, UBC), Natasha Urbancic (PhD student, UBC), Megan Russell (MSc student, UBC), L. Philpott (Research Associate, UBC), M. Al. Asad (Research Associate, UBC), S. Mast (Visiting student from Belgium – worked with me for 2 months in summer 2016).