Ion upflow and downflow at the topside ionosphere observed by the EISCAT VHF radar
We have determined the MLT distribution and K P dependence of the ion upflow and downflow of the thermal bulk oxygen ion population based on a data analysis using the EISCAT VHF radar CP-7 data obtained at Tromsø during the period between 1990 and 1996: (1) both ion upflow and downflow events can be...
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ftdoajarticles:oai:doaj.org/article:7f0124e458634c62a4b9b48b44acfd48 2023-05-15T16:04:33+02:00 Ion upflow and downflow at the topside ionosphere observed by the EISCAT VHF radar M. Endo R. Fujii Y. Ogawa S. C. Buchert S. Nozawa S. Watanabe N. Yoshida 2000-02-01T00:00:00Z https://doi.org/10.1007/s00585-000-0170-3 https://doaj.org/article/7f0124e458634c62a4b9b48b44acfd48 EN eng Copernicus Publications https://www.ann-geophys.net/18/170/2000/angeo-18-170-2000.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-000-0170-3 0992-7689 1432-0576 https://doaj.org/article/7f0124e458634c62a4b9b48b44acfd48 Annales Geophysicae, Vol 18, Pp 170-181 (2000) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2000 ftdoajarticles https://doi.org/10.1007/s00585-000-0170-3 2022-12-31T11:48:58Z We have determined the MLT distribution and K P dependence of the ion upflow and downflow of the thermal bulk oxygen ion population based on a data analysis using the EISCAT VHF radar CP-7 data obtained at Tromsø during the period between 1990 and 1996: (1) both ion upflow and downflow events can be observed at any local time (MLT), irrespective of dayside and nightside, and under any magnetic disturbance level, irrespective of quiet and disturbed levels; (2) these upflow and downflow events are more frequently observed in the nightside than in the dayside; (3) the upflow events are more frequently observed than the downflow events at any local time except midnight and at any K P level and the difference of the occurrence frequencies between the upflow and downflow events is smaller around midnight; and (4) the occurrence frequencies of both the ion upflow and downflow events appear to increase with increasing K P level, while the occurrence frequency of the downflow appears to stop increasing at some K P level. Key words: Ionosphere (particle acceleration; plasma waves and instabilities) - Space plasma physics (transport processes) Article in Journal/Newspaper EISCAT Tromsø Directory of Open Access Journals: DOAJ Articles Tromsø Annales Geophysicae 18 2 170 181 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 M. Endo R. Fujii Y. Ogawa S. C. Buchert S. Nozawa S. Watanabe N. Yoshida Ion upflow and downflow at the topside ionosphere observed by the EISCAT VHF radar |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
We have determined the MLT distribution and K P dependence of the ion upflow and downflow of the thermal bulk oxygen ion population based on a data analysis using the EISCAT VHF radar CP-7 data obtained at Tromsø during the period between 1990 and 1996: (1) both ion upflow and downflow events can be observed at any local time (MLT), irrespective of dayside and nightside, and under any magnetic disturbance level, irrespective of quiet and disturbed levels; (2) these upflow and downflow events are more frequently observed in the nightside than in the dayside; (3) the upflow events are more frequently observed than the downflow events at any local time except midnight and at any K P level and the difference of the occurrence frequencies between the upflow and downflow events is smaller around midnight; and (4) the occurrence frequencies of both the ion upflow and downflow events appear to increase with increasing K P level, while the occurrence frequency of the downflow appears to stop increasing at some K P level. Key words: Ionosphere (particle acceleration; plasma waves and instabilities) - Space plasma physics (transport processes) |
format |
Article in Journal/Newspaper |
author |
M. Endo R. Fujii Y. Ogawa S. C. Buchert S. Nozawa S. Watanabe N. Yoshida |
author_facet |
M. Endo R. Fujii Y. Ogawa S. C. Buchert S. Nozawa S. Watanabe N. Yoshida |
author_sort |
M. Endo |
title |
Ion upflow and downflow at the topside ionosphere observed by the EISCAT VHF radar |
title_short |
Ion upflow and downflow at the topside ionosphere observed by the EISCAT VHF radar |
title_full |
Ion upflow and downflow at the topside ionosphere observed by the EISCAT VHF radar |
title_fullStr |
Ion upflow and downflow at the topside ionosphere observed by the EISCAT VHF radar |
title_full_unstemmed |
Ion upflow and downflow at the topside ionosphere observed by the EISCAT VHF radar |
title_sort |
ion upflow and downflow at the topside ionosphere observed by the eiscat vhf radar |
publisher |
Copernicus Publications |
publishDate |
2000 |
url |
https://doi.org/10.1007/s00585-000-0170-3 https://doaj.org/article/7f0124e458634c62a4b9b48b44acfd48 |
geographic |
Tromsø |
geographic_facet |
Tromsø |
genre |
EISCAT Tromsø |
genre_facet |
EISCAT Tromsø |
op_source |
Annales Geophysicae, Vol 18, Pp 170-181 (2000) |
op_relation |
https://www.ann-geophys.net/18/170/2000/angeo-18-170-2000.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-000-0170-3 0992-7689 1432-0576 https://doaj.org/article/7f0124e458634c62a4b9b48b44acfd48 |
op_doi |
https://doi.org/10.1007/s00585-000-0170-3 |
container_title |
Annales Geophysicae |
container_volume |
18 |
container_issue |
2 |
container_start_page |
170 |
op_container_end_page |
181 |
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1766400133649399808 |