Ionospheric characteristics above Martian crustal magnetic anomalies

Details Ionospheric characteristics above Martian crustal magnetic anomalies Ionospheric characteristics above Martian crustal magnetic anomalies

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3216204w&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 16, CiteID L16204

Mathematics

Probability

16

Ionosphere (6929), Ionosphere: Ionosphere/Magnetosphere Interactions (2736), Planetary Sciences: Solid Surface Planets: Ionospheres (2459), Planetary Sciences: Solid Surface Planets: Magnetic Fields And Magnetism, Planetary Sciences: Solar System Objects: Mars

Scientific paper

We studied several thousand electron density profiles from the Mars Global Surveyor Radio Science experiment. Electron densities in some of these profiles change significantly over vertical distances as short as 1-2 km, often causing localized ``bite-outs''. These ``anomalous'' profiles are preferentially located above crustal magnetic anomalies. Anomalous features and their association with strong magnetic fields are also seen in profiles from Mariner 9. The probability of a profile being anomalous depends on the orientation of the magnetic field, suggesting localized electrodynamic effects upon otherwise global photochemical ionospheric processes. On Mars, unlike most other planets, the magnetic field has a short characteristic lengthscale, so its effects on the ionosphere will vary over short horizontal distances. We discuss possible ionospheric dynamo processes and encourage additional ionospheric observations over regions of strong crustal magnetic field.

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