Role of Ion-drag Processes in the Nighttime, Low-latitude Thermospheric Wind and Temperature Structure

Details Role of Ion-drag Processes in the Nighttime, Low-latitude Thermospheric Wind and Temperature Structure Role of Ion-drag Processes in the Nighttime, Low-latitude Thermospheric Wind and Temperature Structure

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm11d..07m&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM11D-07

Physics

2411 Electric Fields (2712), 2415 Equatorial Ionosphere, 2427 Ionosphere/Atmosphere Interactions (0335), 2768 Plasmasphere, 3369 Thermospheric Dynamics (0358)

Scientific paper

The purpose of this study is to understand the role of the plasmasphere in equatorial electrodynamics, with a focus on the role of ion-drag processes in the nighttime low-latitude thermospheric structure. This study utilizes the Coupled Thermosphere-Ionosphere-Plasmasphere-Electrodynamics (CTIPe) model where the equatorial plasmasphere is self-consistently coupled to the electrodynamics and the global ionosphere and thermosphere system. Ion-drag processes play a significant role in the momentum and energy interactions between the ionized and neutral species. Comprehensive elucidation of the spatial and temporal variations of the 3-dimensional ion-drag, especially in the evening prereversal enhancement of the zonal electric field, requires a self-consistent plasmaspheric distribution together with the electrodynamics and polarization fields associated with the E- and F-layer dynamo. Furthermore, the impact of ion-drag parallel to the field-lines must be considered, since the parallel ion drag in the vicinity of a pronounced Equatorial Ionization Anomaly has a significant impact on the latitudinal structure of the equatorial thermospheric structure. In this study, the mechanism responsible for the latitudinal structure of neutral wind and temperature, such as Equatorial Temperature and Wind Anomaly, Midnight Temperature Maximum and superrotation of the Earth's upper atmosphere, is addressed. The model results indicate that the ion-drag variations derived from the interacting plasmasphere and electrodynamics is an important consideration in these phenomena.

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