MAVEN and the mars initial reference ionosphere model

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Abstract

The Neutral Gas and Ion Mass Spectrometer (NGIMS) on the Mars Atmosphere and Volatile EvolutioN (MAVEN) satellite measured the distribution of thermal ions (2-150 amu) at ionospheric heights (~130-400 km) under midday conditions during the "Deep-Dip" orbit campaign from 17 to 22 April 2015. Assuming charge neutrality, we use the sum of NGIMS ions as a proxy for electron density (Ne) and compare results with a new version of the Mars Initial Reference Ionosphere (MIRI) developed for this study. At altitudes where the transition between photochemical and dynamical processes occurs (130-200 km), the NGIMS results agree with the shape of the MIRI-predicted Ne(h) profiles, but the model predictions are a factor of 2 higher. Above 200 km, the NGIMS gradients of total ions versus height diverge even more from MIRI's Ne(h) predictions for reasons that may involve crustal-B field effects, ionopause-like boundaries, and horizontal plasma transport away from the noon sector - factors not yet included in MIRI.

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APA

Mendillo, M., Narvaez, C., Matta, M., Vogt, M., Mahaffy, P., Benna, M., & Jakosky, B. (2015). MAVEN and the mars initial reference ionosphere model. Geophysical Research Letters, 42(21), 9080–9086. https://doi.org/10.1002/2015GL065732

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