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| Titel |
Interhemispheric contrasts in the ionospheric convection response to changes in the interplanetary magnetic field and substorm activity: a case-study |
| VerfasserIn |
B. A. Shand, T. K. Yeoman, R. V. Lewis, R. A. Greenwald, M. R. Hairston |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 16, no. 7 ; Nr. 16, no. 7, S.764-774 |
| Datensatznummer |
250013337
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| Publikation (Nr.) |
 copernicus.org/angeo-16-764-1998.pdf |
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| Zusammenfassung |
Interhemispheric contrasts in the ionospheric
convection response to variations of the interplanetary magnetic field (IMF) and
substorm activity are examined, for an interval observed by the Polar
Anglo-American Conjugate Experiment (PACE) radar system between ~1600 and ~2100
MLT on 4 March 1992. Representations of the ionospheric convection pattern
associated with different orientations and magnitudes of the IMF and nightside
driven enhancements of the auroral electrojet are employed to illustrate a
possible explanation for the contrast in convection flow response observed in
radar data at nominally conjugate points. Ion drift measurements from the
Defence Meteorological Satellite Program (DMSP) confirm these ionospheric
convection flows to be representative for the prevailing IMF orientation and
magnitude. The location of the fields of view of the PACE radars with respect to
these patterns suggest that the radar backscatter observed in each hemisphere is
critically influenced by the position of the ionospheric convection reversal
boundary (CRB) within the radar field of view and the influence it has on the
generation of the irregularities required as scattering targets by
high-frequency coherent radar systems. The position of the CRB in each
hemisphere is strongly controlled by the relative magnitudes of the IMF Bz
and By components, and hence so is the interhemispheric
contrast in the radar observations.
Key words. Magnetospheric physics · Auroral phenomena
· Magnetosphere-ionosphere interactions · Storms and substorms |
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