Journal article
Ionopause-like density gradients in the Martian ionosphere: A first look with MAVEN
Geophysical research letters, Vol.42(21), pp.8885-8893
11/16/2015
DOI: 10.1002/2015GL065269
Abstract
For unmagnetized planets, the top of the ionosphere is often marked by a sharp change in electron density and other plasma properties, called an ionopause. Here we present a statistical study of dayside ionopause-like density gradients observed in 54% of ion density profiles from the Mars Atmosphere and Volatile EvolutioN (MAVEN) mission spacecraft at Mars. Prior studies of the Martian ionopause have lacked simultaneous comprehensive measurements of plasma and magnetic field properties. Therefore, we use MAVEN observations of the electron density, magnetic field, and ion and electron energy spectra to study the factors that influence properties of the ionopause. On average, profiles with an ionopause are accompanied by a higher energy flux of protons at high altitudes and stronger magnetic field at low altitude than profiles without an ionopause. At altitudes above similar to 300 km, the O+/O-2(+) ratio is significantly larger for profiles with an ionopause than those without an ionopause. These findings enhance our understanding of this important plasma boundary at Mars.
Details
- Title: Subtitle
- Ionopause-like density gradients in the Martian ionosphere: A first look with MAVEN
- Creators
- Marissa F. Vogt - Boston UniversityPaul Withers - Boston UniversityPaul R. Mahaffy - Goddard Space Flight CenterMehdi Benna - Goddard Space Flight CenterMeredith K. Elrod - Goddard Space Flight CenterJasper S. Halekas - University of IowaJohn E. P. Connerney - Goddard Space Flight CenterJared R. Espley - Goddard Space Flight CenterDavid L. Mitchell - Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USAChristian Mazelle - Research Institute in Astrophysics and PlanetologyBruce M. Jakosky - University of Colorado Boulder
- Resource Type
- Journal article
- Publication Details
- Geophysical research letters, Vol.42(21), pp.8885-8893
- Publisher
- Amer Geophysical Union
- DOI
- 10.1002/2015GL065269
- ISSN
- 0094-8276
- eISSN
- 1944-8007
- Number of pages
- 9
- Grant note
- NNX13AO35G / NASA; National Aeronautics & Space Administration (NASA) NASA; National Aeronautics & Space Administration (NASA)
- Language
- English
- Date published
- 11/16/2015
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984428765302771
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