The poleward edge of the mid-latitude trough - Its formation, orientation and dynamics

Details The poleward edge of the mid-latitude trough - Its formation, orientation and dynamics The poleward edge of the mid-latitude trough - Its formation, orientation and dynamics

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jatp...48..715r&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 48, Aug. 1986, p. 715-728.

Computer Science

Sound

24

F Region, Ionospheric Electron Density, Midlatitude Atmosphere, Satellite Sounding, Dynamics Explorer 2 Satellite, Electron Precipitation, Ionospheric Sounding

Scientific paper

Data from the Advanced Ionospheric Sounder (AIS) deployed at Halley, Antarctica (76-deg S, 27-deg W; L = 4.2) and the Dynamics Explorer-2 spacecraft (DE-2) are used to investigate several aspects of the formation processes and dynamics of the poleward edge of the midlatitude electron density trough. These include a study of the flux and energy of charged particles precipitating into the F-region as a function of Magnetic Local Time. It is found that local energetic electron precipitation is a major source of ionization of the poleward edge in the evening sector, but only after magnetic midnight transport processes become more important. Occasionally a significant increase in the flux of conjugate photoelectrons is colocated with the poleward edge of the trough in the morning sector. The combination of AIS and DE-2 data has allowed identification of significant longitudinal structure on the poleward edge of the trough that may be the result of substorm activity. It is found that the orientation of the poleward edge of the trough and the locus of the plasmapause predicted from the 'tear-drop' model vary in rather a similar manner with local time, though no close physical link between the two features is inferred from this coincidence.

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