Journal article
The Effects of Solar Wind Dynamic Pressure on the Structure of the Topside Ionosphere of Mars
Geophysical research letters, Vol.46(15), pp.8652-8662
08/16/2019
DOI: 10.1029/2019GL083643
Abstract
We use Mars Atmosphere and Volatile EvolutioN observations of the upstream solar wind, and Mars Express observations of ionospheric electron densities and magnetic fields, to study how the topside ionosphere (>320 km) of Mars is affected by variations in solar wind dynamic pressure. We find that high solar wind dynamic pressures result in the topside ionosphere being depleted of plasma at all solar zenith angles, coincident with increased induced magnetic field strengths. The depletion of topside plasma in response to high solar wind dynamic pressures is observed in both weak and strong crustal magnetic field regions. Taken together, our results suggest that high solar wind dynamic pressures lead to ionospheric compression, increased ion escape, and reduced day-to-night plasma transport in the high-altitude nightside ionosphere.
Plain Language Summary Mars lacks a global dipole magnetic field to hold off the solar wind. As a consequence, the solar wind can significantly affect the structure of the topside ionosphere. Previous studies detailing these effects, however, have primarily focused on impulsive space weather events. In this work, we use observations from two spacecraft (MAVEN and Mars Express) to statistically study how the solar wind dynamic pressure affects the topside ionosphere. We find that, during times of high solar wind dynamic pressure, the ionosphere is globally depleted of plasma, which suggests that the ionosphere is compressed and plasma escape is enhanced.
Details
- Title: Subtitle
- The Effects of Solar Wind Dynamic Pressure on the Structure of the Topside Ionosphere of Mars
- Creators
- Z. Girazian - University of IowaJ. Halekas - University of IowaD. D. Morgan - University of IowaA. J. Kopf - University of IowaD. A. Gurnett - University of IowaF. Chu - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Geophysical research letters, Vol.46(15), pp.8652-8662
- DOI
- 10.1029/2019GL083643
- ISSN
- 0094-8276
- eISSN
- 1944-8007
- Publisher
- Amer Geophysical Union
- Number of pages
- 11
- Grant note
- 1560641 / NASA; National Aeronautics & Space Administration (NASA) Jet Propulsion Laboratory
- Language
- English
- Date published
- 08/16/2019
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984428790702771
Metrics
12 Record Views