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| Titel |
Improved analysis of plasmasphere motion using the VLA radio interferometer |
| VerfasserIn |
G. W. Hoogeveen, A. R. Jacobson |
| 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 ; 15, no. 2 ; Nr. 15, no. 2, S.236-245 |
| Datensatznummer |
250012631
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| Publikation (Nr.) |
 copernicus.org/angeo-15-236-1997.pdf |
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| Zusammenfassung |
| Observations using the very large (VLA)
radio interferometer during the past five years have enabled the discovery of a
new type of plasmasphere disturbance, the magnetic eastward-directed wave.
Previous work indicated these disturbances were likely frozen to the geomagnetic
field as determined from their azimuth distributions. This work provides a
method to explain more accurately the azimuth distribution, thereby allowing the
calculation of the disturbances' location in the plasmasphere independently of
the measured velocity. The measurable velocity due to corotation is calculated
and subtracted from the measured trace velocity. This difference, or deviation
from corotation, is attributed to electrodynamic convection; the measurement of
plasmaspheric convection may lead to the eventual monitoring of mid-latitude
electric fields. Disturbances are seen convecting predominantly westward, with
the fastest having angular velocities greater than the anticorotating VLA line
of sight. The direction of convection and conditions of observations indicate
that the disturbances are likely the same phenomenon seen by the Los Alamos
satellite beacon array. |
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