Early MAVEN Deep Dip campaign reveals thermosphere and ionosphere variability

Author:

Bougher S.1,Jakosky B.2,Halekas J.3,Grebowsky J.4,Luhmann J.5,Mahaffy P.4,Connerney J.4,Eparvier F.2,Ergun R.2,Larson D.5,McFadden J.5,Mitchell D.5,Schneider N.2,Zurek R.6,Mazelle C.78,Andersson L.2,Andrews D.9,Baird D.10,Baker D. N.2,Bell J. M.11,Benna M.4,Brain D.2,Chaffin M.2,Chamberlin P.4,Chaufray J.-Y.12,Clarke J.13,Collinson G.4,Combi M.1,Crary F.2,Cravens T.14,Crismani M.2,Curry S.5,Curtis D.5,Deighan J.2,Delory G.5,Dewey R.2,DiBraccio G.4,Dong C.1,Dong Y.2,Dunn P.5,Elrod M.4,England S.5,Eriksson A.9,Espley J.4,Evans S.15,Fang X.2,Fillingim M.5,Fortier K.2,Fowler C. M.2,Fox J.16,Gröller H.17,Guzewich S.4,Hara T.5,Harada Y.5,Holsclaw G.2,Jain S. K.2,Jolitz R.5,Leblanc F.12,Lee C. O.5,Lee Y.1,Lefevre F.12,Lillis R.5,Livi R.5,Lo D.17,Ma Y.18,Mayyasi M.13,McClintock W.2,McEnulty T.2,Modolo R.12,Montmessin F.12,Morooka M.2,Nagy A.1,Olsen K.1,Peterson W.2,Rahmati A.14,Ruhunusiri S.3,Russell C. T.18,Sakai S.14,Sauvaud J.-A.78,Seki K.19,Steckiewicz M.78,Stevens M.20,Stewart A. I. F.2,Stiepen A.2,Stone S.17,Tenishev V.1,Thiemann E.2,Tolson R.11,Toublanc D.78,Vogt M.13,Weber T.2,Withers P.13,Woods T.2,Yelle R.17

Affiliation:

1. CLaSP Department, University of Michigan, Ann Arbor, MI, USA.

2. Laboratory for Atmospheric and Space Physics, University. of Colorado, Boulder, CO, USA.

3. Department of Physics and Astronomy, University of Iowa, Iowa City, IA, USA.

4. NASA/Goddard Space Flight Center, Greenbelt, MD, USA.

5. Space Sciences Laboratory, University of California at Berkeley, Berkeley, CA, USA.

6. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.

7. CNRS/Institut de Recherche en Astrophysique et Planétologie, Toulouse, France.

8. University Paul Sabatier, Toulouse, France.

9. Swedish Institute of Space Physics, Kiruna, Sweden.

10. NASA/Johnson Space Center, Houston, TX, USA.

11. National Institute of Aerospace, Hampton, VA, USA.

12. Laboratoire Atmosphères, Milieux, Observations Spatiales /CNRS, Verrieres-le-Buisson, France.

13. Department of Astronomy, Boston University, Boston, MA, USA.

14. Department of Physics and Astronomy, University of Kansas, Lawrence, KS, USA.

15. Computational Physics, Springfield, VA, USA.

16. Department of Physics, Wright State University, Fairborn, OH, USA.

17. Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA.

18. Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA, USA.

19. Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Aichi, Japan.

20. Naval Research Laboratory, Washington, DC, USA.

Abstract

The Mars Atmosphere and Volatile Evolution (MAVEN) mission, during the second of its Deep Dip campaigns, made comprehensive measurements of martian thermosphere and ionosphere composition, structure, and variability at altitudes down to ~130 kilometers in the subsolar region. This altitude range contains the diffusively separated upper atmosphere just above the well-mixed atmosphere, the layer of peak extreme ultraviolet heating and primary reservoir for atmospheric escape. In situ measurements of the upper atmosphere reveal previously unmeasured populations of neutral and charged particles, the homopause altitude at approximately 130 kilometers, and an unexpected level of variability both on an orbit-to-orbit basis and within individual orbits. These observations help constrain volatile escape processes controlled by thermosphere and ionosphere structure and variability.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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