Electromagnetic energy deposition rate in the polar upper thermosphere derived from the EISCAT Svalbard radar and CUTLASS Finland radar observations
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...
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ftcopernicus:oai:publications.copernicus.org:angeo36274 2023-05-15T16:04:46+02:00 Electromagnetic energy deposition rate in the polar upper thermosphere derived from the EISCAT Svalbard radar and CUTLASS Finland radar observations Fujiwara, H. Kataoka, R. Suzuki, M. Maeda, S. Nozawa, S. Hosokawa, K. Fukunishi, H. Sato, N. Lester, M. 2018-09-27 application/pdf https://doi.org/10.5194/angeo-25-2393-2007 https://angeo.copernicus.org/articles/25/2393/2007/ eng eng doi:10.5194/angeo-25-2393-2007 https://angeo.copernicus.org/articles/25/2393/2007/ eISSN: 1432-0576 Text 2018 ftcopernicus https://doi.org/10.5194/angeo-25-2393-2007 2020-07-20T16:26:58Z 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. Text EISCAT Svalbard Copernicus Publications: E-Journals Pedersen ENVELOPE(140.013,140.013,-66.668,-66.668) Svalbard Annales Geophysicae 25 11 2393 2403 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
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. |
format |
Text |
author |
Fujiwara, H. Kataoka, R. Suzuki, M. Maeda, S. Nozawa, S. Hosokawa, K. Fukunishi, H. Sato, N. Lester, M. |
spellingShingle |
Fujiwara, H. Kataoka, R. Suzuki, M. Maeda, S. Nozawa, S. Hosokawa, K. Fukunishi, H. Sato, N. Lester, M. Electromagnetic energy deposition rate in the polar upper thermosphere derived from the EISCAT Svalbard radar and CUTLASS Finland radar observations |
author_facet |
Fujiwara, H. Kataoka, R. Suzuki, M. Maeda, S. Nozawa, S. Hosokawa, K. Fukunishi, H. Sato, N. Lester, M. |
author_sort |
Fujiwara, H. |
title |
Electromagnetic energy deposition rate in the polar upper thermosphere derived from the EISCAT Svalbard radar and CUTLASS Finland radar observations |
title_short |
Electromagnetic energy deposition rate in the polar upper thermosphere derived from the EISCAT Svalbard radar and CUTLASS Finland radar observations |
title_full |
Electromagnetic energy deposition rate in the polar upper thermosphere derived from the EISCAT Svalbard radar and CUTLASS Finland radar observations |
title_fullStr |
Electromagnetic energy deposition rate in the polar upper thermosphere derived from the EISCAT Svalbard radar and CUTLASS Finland radar observations |
title_full_unstemmed |
Electromagnetic energy deposition rate in the polar upper thermosphere derived from the EISCAT Svalbard radar and CUTLASS Finland radar observations |
title_sort |
electromagnetic energy deposition rate in the polar upper thermosphere derived from the eiscat svalbard radar and cutlass finland radar observations |
publishDate |
2018 |
url |
https://doi.org/10.5194/angeo-25-2393-2007 https://angeo.copernicus.org/articles/25/2393/2007/ |
long_lat |
ENVELOPE(140.013,140.013,-66.668,-66.668) |
geographic |
Pedersen Svalbard |
geographic_facet |
Pedersen Svalbard |
genre |
EISCAT Svalbard |
genre_facet |
EISCAT Svalbard |
op_source |
eISSN: 1432-0576 |
op_relation |
doi:10.5194/angeo-25-2393-2007 https://angeo.copernicus.org/articles/25/2393/2007/ |
op_doi |
https://doi.org/10.5194/angeo-25-2393-2007 |
container_title |
Annales Geophysicae |
container_volume |
25 |
container_issue |
11 |
container_start_page |
2393 |
op_container_end_page |
2403 |
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1766400398082441216 |