Parameterization of Secondary Ionization Rates and Photoelectron Heating Rates of Venus and Mars

Author:

Liu Zerui123ORCID,Lei Jiuhou123ORCID,Yan Maodong123ORCID,Cao Yu‐tian4ORCID,Dang Tong123ORCID,Cui Jun4ORCID,Zhang Binzheng5ORCID

Affiliation:

1. Deep Space Exploration Laboratory/School of Earth and Space Sciences University of Science and Technology of China Hefei China

2. CAS Center for Excellence in Comparative Planetology/CAS Key Laboratory of Geospace Environment/Mengcheng National Geophysical Observatory University of Science and Technology of China Hefei China

3. Collaborative Innovation Center of Astronautical Science and Technology Harbin China

4. Planetary Environmental and Astrobiological Research Laboratory (PEARL) School of Atmospheric Sciences Sun Yat‐sen University Zhuhai China

5. Department of Earth Sciences the University of Hong Kong Pokfulam China

Abstract

AbstractAs a fundamental physical process in the ionosphere, photoionization and the associated photoelectrons play vital roles in determining the ionospheric electron density and temperature for Earth and other planets with atmospheres such as Mars and Venus. The production and transport of ionospheric photoelectrons have been widely examined on Earth, but relatively less studied for other terrestrial planets, such as Mars and Venus. In this study, a two‐stream photoelectron transport model for Mars and Venus is constructed, in which the photoelectron fluxes, photoelectron heating rates, primary and secondary ionization rates are calculated. The simulated photoelectron fluxes agree with Mars Atmosphere and Volatile Evolution (MAVEN) observations at various altitudes, with the input of solar spectrum irradiance, electron density and temperature, neutral density and temperature observed by MAVEN. Moreover, by parametrically fitting the simulation results for various solar zenith angles and solar activities, we obtain empirical parameterized formulas for ionization and heating efficiencies which can potentially be adapted to planetary ionospheric models for the community.

Publisher

American Geophysical Union (AGU)

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