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| Titel |
Observations of convection in the dayside magnetosphere by the beam instrument on Geotail |
| VerfasserIn |
H. Matsui, M. Nakamura, T. Mukai, K. Tsuruda, H. Hayakawa |
| 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 ; 19, no. 3 ; Nr. 19, no. 3, S.303-310 |
| Datensatznummer |
250014219
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| Publikation (Nr.) |
 copernicus.org/angeo-19-303-2001.pdf |
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| Zusammenfassung |
We report observations of
magnetospheric convection by the beam instrument, EFD-B, on Geotail. The region
analyzed in this study is mainly the afternoon sector of the magnetosphere
between L = 9.7 - 11.5. When the instrument is operated, electron beams are
emitted from guns and some of them return to detectors attached to the main body
of the satellite. However, we find that the return beams are often spread over a
wide range of satellite spin phase angles, so that the calculated convection is
unreliable. In order to remove noisy data, we set up suitable selection
criteria. We infer that the convection strength is of the order of 20 km/s. The
convection has generally westward and outward components. This indicates that
the plasma located at the satellite positions is being convected toward the
magnetopause. Moreover, the obtained convection is highly variable because
standard deviations are comparable to the strength. We then compare the
convection estimated by the beam instrument with that by the particle
instrument, LEP. We find that the convections derived from the two instruments
are positively correlated, with correlation coefficients above 0.7. The analysis
reported here is expected to be useful in the interpretation of the
multi-spacecraft data from the Cluster II mission.
Key words. Magnetospheric physics (current systems;
electric fields; instruments and techniques) |
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