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| Titel |
Electromagnetic energy deposition rate in the polar upper thermosphere derived from the EISCAT Svalbard radar and CUTLASS Finland radar observations |
| VerfasserIn |
H. Fujiwara, R. Kataoka, M. Suzuki, S. Maeda, S. Nozawa, K. Hosokawa, H. Fukunishi, N. Sato, Mark Lester |
| 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 ; 25, no. 11 ; Nr. 25, no. 11 (2007-11-29), S.2393-2403 |
| Datensatznummer |
250015948
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| Publikation (Nr.) |
 copernicus.org/angeo-25-2393-2007.pdf |
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| Zusammenfassung |
| From simultaneous observations of the European incoherent scatter Svalbard
radar (ESR) and the Cooperative UK Twin Located Auroral Sounding System
(CUTLASS) Finland radar on 9 March 1999, we have derived the height
distributions of the thermospheric heating rate at the F region height in
association with electromagnetic energy inputs into the dayside polar
cap/cusp region. The ESR and CUTLASS radar observations provide the
ionospheric parameters with fine time-resolutions of a few minutes. Although
the geomagnetic activity was rather moderate (Kp=3+~4), the
electric field obtained from the ESR data sometimes shows values exceeding
40 mV/m. The estimated passive energy deposition rates are also larger than
150 W/kg in the upper thermosphere over the ESR site during the period of
the enhanced electric field. In addition, enhancements of the Pedersen
conductivity also contribute to heating the upper thermosphere, while there
is only a small contribution for thermospheric heating from the direct
particle heating due to soft particle precipitation in the dayside polar
cap/cusp region. In the same period, the CUTLASS observations of the ion
drift show the signature of poleward moving pulsed ionospheric flows with a
recurrence rate of about 10–20 min. The estimated electromagnetic
energy deposition rate shows the existence of the strong heat source in the
dayside polar cap/cusp region of the upper thermosphere in association with
the dayside magnetospheric phenomena of reconnections and flux transfer
events. |
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