Influence of Magnetic Fields on Precipitating Solar Wind Hydrogen at Mars

被引：4
作者：
Henderson, Sarah [1 ]
Halekas, Jasper [1 ]
Girazian, Zach [1 ]
Espley, Jared [2 ]
Elrod, Meredith [3 ,4 ]
机构：
[1] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA
[2] NASA, Goddard Space Flight Ctr, Greenbelt, MD USA
[3] NASA, Goddard Space Flight Ctr, Planetary Environments Lab, Greenbelt, MD USA
[4] Univ Maryland, CRESST II, College Pk, MD 20742 USA
来源：
GEOPHYSICAL RESEARCH LETTERS | 2022年 / 49卷 / 12期
关键词：
penetrating protons; solar wind hydrogen; MAVEN; 1ST-ENA OBSERVATIONS; UPPER-ATMOSPHERE; CHARGE-EXCHANGE; ATOMS; VARIABILITY; PROTON; ENAS;
D O I：
10.1029/2022GL099114
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
Solar wind protons can interact directly with the hydrogen corona of Mars through charge exchange, resulting in energetic neutral atoms (ENAs) able to penetrate deep into the upper atmosphere of Mars. ENAs can undergo multiple charge changing interactions, leading to an observable beam of penetrating protons in the upper atmosphere. We seek to characterize the behavior of these protons in the presence of magnetic fields using data collected by the Mars Atmosphere and Volatile EvolutioN spacecraft. We find that backscattered penetrating proton flux is enhanced in regions where the magnetic field strength is greater than 200 nT. We also find a strong correlation at CO2 column densities less than 5.5 x 10(14) cm(-2) between magnetic field strength and the observed backscattered and downward flux. We do not see significant changes in penetrating proton flux with magnetic field strengths on the order of 10 nT.
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页数：10
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共 39 条
  • [1] Magnetic field and plasma observations at Mars:: Initial results of the Mars global surveyor mission
    Acuña, MH
    Connerney, JEP
    Wasilewski, P
    Lin, RP
    Anderson, KA
    Carlson, CW
    McFadden, J
    Curtis, DW
    Mitchell, D
    Reme, H
    Mazelle, C
    Sauvaud, JA
    d'Uston, C
    Cros, A
    Medale, JL
    Bauer, SJ
    Cloutier, P
    Mayhew, M
    Winterhalter, D
    Ness, NF
    [J]. SCIENCE, 1998, 279 (5357) : 1676 - 1680
  • [2] MARINER-6 AND MARINER-7 ULTRAVIOLET SPECTROMETER EPXERIMENT - ANALYSIS OF HYDROGEN LYMAN-ALPHA DATA
    ANDERSON, DE
    HORD, CW
    [J]. JOURNAL OF GEOPHYSICAL RESEARCH, 1971, 76 (28): : 6666 - +
  • [3] MARINER 6, 7, AND 9 ULTRAVIOLET SPECTROMETER EXPERIMENT - ANALYSIS OF HYDROGEN LYMAN-ALPHA DATA
    ANDERSON, DE
    [J]. JOURNAL OF GEOPHYSICAL RESEARCH, 1974, 79 (10): : 1513 - 1518
  • [4] Monte Carlo Simulations of the Interaction of Fast Proton and Hydrogen Atoms With the Martian Atmosphere and Comparison With In Situ Measurements
    Bisikalo, D. V.
    Shematovich, V. I.
    Gerard, J. -C.
    Hubert, B.
    [J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 2018, 123 (07) : 5850 - 5861
  • [5] The magnetic field draping direction at Mars from April 1999 through August 2004
    Brain, David A.
    Mitchell, David L.
    Halekas, Jasper S.
    [J]. ICARUS, 2006, 182 (02) : 464 - 473
  • [6] Solar wind proton deposition into the Martian atmosphere
    Brecht, SH
    [J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 1997, 102 (A6) : 11287 - 11294
  • [7] First ENA observations at Mars:: Solar-wind ENAs on the nightside
    Brinkfeldt, K.
    Gunell, H.
    C son Brandt, P.
    Barabash, S.
    Frahm, R. A.
    Winningham, J. D.
    Kallio, E.
    Holmstrom, M.
    Futaana, Y.
    Ekenback, A.
    Lundin, R.
    Andersson, H.
    Yamauchi, M.
    Grigoriev, A.
    Sharber, J. R.
    Scherrer, J. R.
    Coates, A. J.
    Linder, D. R.
    Kataria, D. O.
    Koskinen, H.
    Sales, T.
    Riihela, P.
    Schmidt, W.
    Kozyra, J.
    Luhmann, J.
    Roelof, E.
    Williams, D.
    Livi, S.
    Curtis, C. C.
    Hsieh, K. C.
    Sandel, B. R.
    Grande, M.
    Carter, M.
    Sauvaud, J. -A.
    Fedorov, A.
    Thocaven, J. -J.
    McKenna-Lawler, S.
    Orsini, S.
    Cerulli-Irelli, R.
    Maggi, M.
    Wurz, P.
    Bochsler, P.
    Krupp, N.
    Woch, J.
    Fraenz, M.
    Asamura, K.
    Dierker, C.
    [J]. ICARUS, 2006, 182 (02) : 439 - 447
  • [8] Observation of the hydrogen corona with SPICAM on Mars Express
    Chaufray, J. Y.
    Bertaux, J. L.
    Leblanc, F.
    Quemerais, E.
    [J]. ICARUS, 2008, 195 (02) : 598 - 613
  • [9] The MAVEN Magnetic Field Investigation
    Connerney, J. E. P.
    Espley, J.
    Lawton, P.
    Murphy, S.
    Odom, J.
    Oliversen, R.
    Sheppard, D.
    [J]. SPACE SCIENCE REVIEWS, 2015, 195 (1-4) : 257 - 291
  • [10] A case study of proton precipitation at Mars: Mars Express observations and hybrid simulations
    Dieval, C.
    Kallio, E.
    Barabash, S.
    Stenberg, G.
    Nilsson, H.
    Futaana, Y.
    Holmstrom, M.
    Fedorov, A.
    Frahm, R. A.
    Jarvinen, R.
    Brain, D. A.
    [J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 2012, 117
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