Low latitude electrodynamics in Global Ionosphere-Thermosphere Model

Details Low latitude electrodynamics in Global Ionosphere-Thermosphere Model Low latitude electrodynamics in Global Ionosphere-Thermosphere Model

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa51b1611v&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA51B-1611

Other

[2411] Ionosphere / Electric Fields, [2415] Ionosphere / Equatorial Ionosphere, [2437] Ionosphere / Ionospheric Dynamics

Scientific paper

The University of Michigan’s Global Ionosphere-Thermosphere Model (GITM) is a self-consistent model that uses a three dimensional spherical grid, and is different from all other coupled upper atmospheric codes in that it relaxes the hydrostatic assumption. GITM includes the IGRF magnetic field with the APEX coordinate system, set for the date of the simulation. The ion velocity is determined by balancing the ion-neutral drag, gravity, gradients in pressure, and external electric fields; while the electron velocity is considered to be the EXB drift. Using recently constructed a new self-consistent low-latitude electrodynamics solver within GITM, a two-dimensional electrostatic potential pattern is obtained assuming the equipotential field lines in the ionosphere. This presentation describes the results of the vertical ion drifts at magnetic equator obtained from GITM under different solar conditions, seasons, and tidal inputs. We also discuss the role of the penetration electric fields versus the dynamo potential. The model is capable of capturing the salient features of the low to mid latitude ionosphere.

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