Study of Exospheric Neutral Composition of Mars observed from Indian Mars Orbiter Mission |
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| Affiliation: | 1. Department of Physics, Bangalore University, Bengaluru-560056, India;2. Indian Space Research Organisation Headquarters, Bengaluru-560231, India;1. Department of Mathematics, Birla Institute of Technology and Science-Pilani, Hyderabad Campus, Hyderabad 500078, India;2. Department of Astronomy, Osmania University, Hyderabad 500007, India;1. Research Institute for Astronomy and Astrophysics of Maragha (RIAAM), University of Maragheh, P.O. Box: 55136-553, Maragheh, Iran;2. Research Institute for Applied Physics and Astronomy, University of Tabriz, Tabriz, P.O. Box: 5166616471, Iran;3. Department of Theoretical Physics and Astrophysics, Faculty of Physics, University of Tabriz, Tabriz, P.O. Box: 51666-16471, Iran;4. Astronomical institute, Academy of Sciences of the Czech Republic (v.v.i.), fričova 298, 25165 Ondřejov, Czech Republic |
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| Abstract: | The exospheric composition data of Mars for the period 2014–15 has been extracted and analysed using the observations carried out by the MENCA (Mars Exospheric Neutral Composition Analyser) payload on-board the Mars Orbiter Mission (MOM) launched by India. The latitude, longitude, altitude and solar zenith angle coverage of the partial pressure values of different exospheric constituents are determined and assigned to create a new data-set with orbit-wise data assimilation particularly between 260 and 600 km altitude range. Apart from getting the results on mean individual orbits’ partial pressure profiles, the variations of the total as well as partial pressures are studied with respect to the distribution of the major atmospheric constituents and their dependence on solar activity. In particular, CO2 and O variations are considered together for any differential effects due to photolysis and photo-ionisation. The results on the gradual reduction in densities due to decreasing daily mean sunspot numbers and strong response of CO2 and O pressures to solar energetic particle events like that of 24 December 2014 are presented. |
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