Numerical Prediction Of Changes In Atmospheric Chemical Composition By Precipitation Of Solar Energetic Particles At Mars
Y. Nakamura, F. Leblanc, Latmos, Sorbonne Université, Paris, France (Yuki.Nakamura@Latmos.Ipsl.Fr),
N. Terada, I. Murata, H. Nakagawa, S. Sakai, S. Hiruba, Department Of Geophysics, Tohoku University,
Sendai, Japan, R. Kataoka, K. Murase, National Institute Of Polar Research, Tokyo, Japan; The Graduate
University For Advanced Studies, Sokendai, Kanagawa, Japan.
Introduction:
Solar Energetic Particles (Seps) Are Highenergetic Particles That Consist Mainly Of Electrons
And Protons With Energies From A Few Tens Of Kev To
Gev Ejected From The Sun Associated With Solar
Flares And Coronal Mass Ejections. Seps That Precipitate Into Planetary Atmospheres Cause Ionization,
Excitation And Dissociation Of Atmospheric Molecules,
Leading To Changes In Atmospheric Chemical Composition Via Chemical Network (E.G. Solomon Et Al., 1981;
Adams Et Al., 2021). The Effects Of Seps On The Atmospheric Chemical Composition On Earth Has Been
Intensively Studied. For Instance, During The Enormous Solar Flare That Occurred In Late October 2003,
Nox (No + No2) And Hox (Oh + Ho2) Concentrations Were Enhanced And Ozone Concentration Was
Depleted By 40% At The Polar Lower Mesosphere (E.G.
Jackman Et Al., 2005). Recently, The Mars Atmosphere And Volatile Evolution (Maven) Spacecraft
Has Discovered Global Diffuse Aurora On The Nightside
Of Mars During Sep Events (Schneider Et Al., 2015),
Which Has Been Shown To Be Generated Mainly By