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Planetary Ionospheres

Magnetic Fields, Chemical Processes, and Ionospheric Structure
  • Erdal Yiğit
Chapter
Part of the SpringerBriefs in Earth Sciences book series (BRIEFSEARTH)

Abstract

An ionosphere is a consequence of photoionization and is the partially ionized portion of a planetary atmosphere. It contains free electrons and ions, whose dynamics produces complex current systems, depending on ambient electric fields, and collisional properties, and gyration around magnetic fields. In terms of the vertical extent, the ionosphere coincides with the thermosphere, where the neutral species are diffusively separated, owing to strong molecular diffusivity and insufficient turbulent mixing. In a similar fashion, the vertical profiles of plasma species are greatly influenced by diffusive equilibrium. Ionospheric dynamics is modified by the geomagnetic field, which has a strong dipole component. Chemical processes have to be considered in detail in additional to dynamics in the ionosphere. Therefore, in the chemical continuity equation, chemical production and loss processes cannot be neglected. A Chapman layer is a first order approximation of production of ionization by the absorption of solar energy, which is a good description for the lower ionosphere (\(E, F_1\) regions), but higher up in the \(F_2 \) region transport becomes important. Qualitatively, Earth’s and Mars ionospheres demonstrate overall various similarities, besides major differences. Interaction with other species, and external (solar effects) and internal (lower atmospheric) processes play an important role in both ionospheres.

Keywords

Ionosphere Diffusive equilibrium Magnetic fields Chapman layer Space weather Planetary ionosphere Earth’s ionosphere Martian ionosphere 

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Copyright information

© The Author(s) 2018

Authors and Affiliations

  1. 1.Department of Physics and AstronomyGeorge Mason UniversityFairfaxUSA

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