Long-lived auroral structures and atmospheric losses through auroral flux tubes on Mars

Details Long-lived auroral structures and atmospheric losses through auroral flux tubes on Mars Long-lived auroral structures and atmospheric losses through auroral flux tubes on Mars

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3608108d&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 8, CiteID L08108

Physics

4

Planetary Sciences: Solar System Objects: Mars, Ionosphere: Auroral Ionosphere (2704), Planetary Sciences: Solid Surface Planets: Aurorae And Airglow, Magnetospheric Physics: Planetary Magnetospheres (5443, 5737, 6033), Magnetospheric Physics: Solar Wind/Magnetosphere Interactions

Scientific paper

The ASPERA-3 observations of electron and ion fluxes over the regions dominated by crustal magnetic fields show the existence of long-lived and active aurora-type magnetic flux tubes with a width of 20-150 km. The activity manifests itself by large electron energy fluxes (≥10-4 W/m2) and strong distortions in the upper (350-400 km) ionosphere. In some events the peaked electron energy distributions typical for Earth aurora are so pronounced that they are present in velocity distribution functions. A significant depletion of such auroral flux tubes is accompanied by the appearance of oxygen beams and a heating of the ions of ionospheric origin. Auroral activity was observed on several subsequent orbits of the Mars Express spacecraft during more than two weeks implying a stable existence of aurora on Mars. Atmospheric loss driven by energy deposition in the auroral flux tubes is estimated as ˜1023 s-1.

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