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ISSN  2096-3955

CN  10-1502/P

Citation: Wang, J., Xu, X. J., Yu, J., and Ye, Y. D. (2020). South-north asymmetry of proton density distribution in the Martian magnetosheath. Earth Planet. Phys., 4(1), 32–37.doi: 10.26464/epp2020003

2020, 4(1): 32-37. doi: 10.26464/epp2020003


South-north asymmetry of proton density distribution in the Martian magnetosheath


State Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology, Macau 999078, China


School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai Guangdong 519082, China

Corresponding author: XiaoJun Xu,

Received Date: 2019-10-11
Web Publishing Date: 2020-01-01

We perform a statistical analysis of data from the Mars Atmosphere and Volatile Evolution (MAVEN) project on the global distribution of protons in the Martian magnetosheath. Our results show that the proton number density distribution has a south-north asymmetry. This south-north asymmetry is most likely caused by the south-north asymmetric distributions of the crustal magnetic fields at Mars. The strong crustal magnetic fields push the inner boundary of magnetosheath to a higher altitude in the southern hemisphere. Due to the outward movement of the inner boundary of the magnetosheath, a compressed magnetosheath forms, causing subsequent increases in proton number density, thermal pressure, and total pressure. Eventually, a balance is reached between the increased total pressure inside the magnetosheath and the increased magnetic pressure inside the induced magnetosphere. Our statistical study suggests that the Martian crustal magnetic fields can strongly affect the proton number density distribution in the Martian magnetosheath.

Key words: Martian magnetosheath, south-north asymmetry, proton density distribution, crustal magnetic field

Acuña, M. H., Connerney, J. E. P., Wasilewski, P., Lin, R. P., Anderson, K. A., Carlson, C. W., McFadden, J., Curtis, D. W., Reme, M. H., … Ness, N. F. (1998). Magnetic field and plasma observations at Mars: initial results of the Mars Global Surveyor mission. Science, 279(5357), 1676–1680.

Bertucci, C., Mazelle, C., Acuña, M. H., Russell, C. T., and Slavin, J. A. (2005). Structure of the magnetic pileup boundary at Mars and Venus. J. Geophys. Res., 110(A1), A01209.

Bertucci, C., Duru, F., Edberg, N., Fraenz, M., Martinecz, C., Szego, K., and Vaisberg, O. (2011). The induced magnetospheres of Mars, Venus, and Titan. Space Sci. Rev., 162(1-4), 113–171.

Brain, D. A., Halekas, J. S., Lillis, R. J., Mitchell, D. L., Lin, R. P., and Crider, D. H. (2005). Variability of the altitude of the Martian sheath. Geophys. Res. Lett., 32(18), L18203.

Breus, T. K., Krymskii, A. M., Lundin, R., Dubinin, E. M., Luhmann, J. G., Yeroshenko, Y. G., Barabash, S. V., Mitnitskii, V. Y., Pissarenko, N. F., and Styashkin, V. A. (1991). The solar wind interaction with Mars: consideration of Phobos 2 mission observations of an ion composition boundary on the dayside. J. Geophys. Res., 96(A7), 11165–11174.

Chaffin, M. S., Chaufray, J. Y., Deighan, J., Schneider, N. M., McClintock, W. E., Stewart, A. I. F., Thiemann, E., Clarke, J. T., Holsclaw, G. M., … Jakosky, B. M. (2015). Three-dimensional structure in the Mars H corona revealed by IUVS on MAVEN. Geophys. Res. Lett., 42(21), 9001–9008.

Connerney, J. E. P., Espley, J. R., Lawton, P., Murphy, S., Odom, J., Oliversen, R., and Sheppard, D. (2015). The MAVEN magnetic field investigation. Space Sci. Rev., 195(1-4), 257–291.

Crider, D. H., Acuña, M. H., Connerney, J. E. P., Vignes, D., Ness, N. F., Krymskii, A. M., Breus, T. K., Rème, H., Mazelle, C., … Winterhalter, D. (2002). Observations of the latitude dependence of the location of the martian magnetic pileup boundary. Geophys. Res. Lett., 29(8), 1170.

Dong, C. F., Bougher, S. W., Ma, Y. J., Toth, G., Lee, Y., Nagy, A. F., Tenishev, V., Pawlowski, D. J., Combi, M. R., and Najib, D. (2015). Solar wind interaction with the Martian upper atmosphere: crustal field orientation, solar cycle, and seasonal variations. J. Geophys. Res., 120(9), 7857–7872.

Dubinin, E., Fränz, M., Woch, J., Roussos, E., Barabash, S., Lundin, R., Winningham, J. D., Frahm, R. A., and Acuña, M. (2006a). Plasma morphology at Mars. ASPERA-3 observations. Space Sci. Rev., 126(1-4), 209–238.

Dubinin, E., Fraenz, M., Woch, J., Barabash, S., Lundin, R., and Yamauchi, M. (2006b). Hydrogen exosphere at Mars: pickup protons and their acceleration at the bow shock. Geophys. Res. Lett., 33(22), L22103.

Edberg, N. J. T., Brain, D. A., Lester, M., Cowley, S. W. H., Modolo, R., Fränz, M., and Barabash, S. (2009). Plasma boundary variability at Mars as observed by Mars Global Surveyor and Mars Express. Ann. Geophys., 27(9), 3537–3550.

Fang, X. H., Ma, Y. J., Masunaga, K., Dong, Y. X., Brain, D., Halekas, J., Lillis, R., Jakosky, B., Connerney, J., … Dong, C. F. (2017). The Mars crustal magnetic field control of plasma boundary locations and atmospheric loss: MHD prediction and comparison with MAVEN. J. Geophys. Res., 122(4), 4117–4137.

Feldman, P. D., Steffl, A. J., Parker, J. W., A’Hearn, M. F., Bertaux, J. L., Stern, S. A., Weaver, H. A., Slater, D. C., Versteeg, M., … Feaga, L. M. (2011). Rosetta-Alice observations of exospheric hydrogen and oxygen on Mars. Icarus, 214(2), 394–399.

Halekas, J. S., Taylor, E. R., Dalton, G., Johnson, G., Curtis, D. W., McFadden, J. P., Mitchell, D. L., Lin, R. P., and Jakosky, B. M. (2015). The solar wind ion analyzer for MAVEN. Space Sci. Rev.,

Halekas, J. S., Ruhunusiri, S., Harada, Y., Collinson, G., Mitchell, D. L., Mazelle, C., McFadden, J. P., Connerney, J. E. P., Espley, J. R., … Jakosky, B. M. (2017a). Structure, dynamics, and seasonal variability of the Mars-solar wind interaction: MAVEN Solar Wind Ion Analyzer in-flight performance and science results. J. Geophys. Res., 121(1), 547–578.

Halekas, J. S., Brain, D. A., Luhmann, J. G., DiBraccio, G. A., Ruhunusiri, S., Harada, Y., Fowler, C. M., Mitchell, D. L., Connerney, J. E. P., … Jakosky, B. M. (2017b). Flows, fields, and forces in the Mars-solar wind interaction. J. Geophys. Res., 122(11), 11320–11341.

Luhmann, J. G., Acuña, M. H., Purucker, M., Russell, C. T., and Lyon, J. G. (2002). The Martian magnetosheath: how Venus-like?. Planet. Space Sci., 50(5-6), 489–502.

Ma, Y. J., Fang, X. H., Russell, C. T., Nagy, A. F., Toth, G., Luhmann, J. G., Brain, D. A., and Dong, C. F. (2014). Effects of crustal field rotation on the solar wind plasma interaction with Mars. Geophys. Res. Lett., 41(19), 6563–6569.

Matsunaga, K., Seki, K., Brain, D. A., Hara, T., Masunaga, K., Mcfadden, J. P., Halekas, J. S., Mitchell, D. L., Mazelle, C., … Jakosky, B. M. (2017). Statistical study of relations between the induced magnetosphere, ion composition, and pressure balance boundaries around mars based on MAVEN observations. J. Geophys. Res., 122(9), 9723–9737.

Mazelle, C., Winterhalter, D., Sauer, K., Trotignon, J. G., Acuña, M. H., Baumgärtel, K., Bertucci, C., Brain, D. A., Brecht, S. H., … Slavin, J. (2004). Bow shock and upstream phenomena at Mars. Space Sci. Rev., 111(1-2), 115–181.

Morschhauser, A., Lesur, V., and Grott, M. (2014). A spherical harmonic model of the lithospheric magnetic field of Mars. J. Geophys. Res., 119(6), 1162–1188.

Nagy, A. F., Winterhalter, D., Sauer, K., Cravens, T. E., Brecht, S., Mazelle, C., Crider, D., Kallio, E., Zakharov, A., … Trotignon, J. G. (2004). The plasma environment of Mars. Space Sci. Rev., 111(1-2), 33–114.

Øieroset, M., Mitchell, D. L., Phan, T. D., Lin, R. P., Crider, D. H., and Acuña, M. H. (2004). The magnetic field pile-up and density depletion in the Martian magnetosheath: a comparison with the plasma depletion layer upstream of the Earth's magnetopause. Space Sci. Rev., 111(1-2), 185–202.

Sauer, K., Bogdanov, A., and Baumgärtel, K. (1994). Evidence of an ion composition boundary (protonopause) in bi-ion fluid simulations of solar wind mass loading. Geophys. Res. Lett., 21(20), 2255–2258.

Vignes, D., Mazelle, C., Rme, H., Acuña, M. H., Connerney, J. E. P., Lin, R. P., Mitchell, D. L., Cloutier, P., Crider, D. H., and Ness, N. F. (2000). The solar wind interaction with mars: locations and shapes of the bow shock and the magnetic pile-up boundary from the observations of the MAG/ER experiment onboard mars global surveyor. Geophys. Res. Lett., 27(1), 49–52.


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South-north asymmetry of proton density distribution in the Martian magnetosheath

Jing Wang, XiaoJun Xu, Jiang Yu, YuDong Ye