Joule heating hot spot at high latitudes in the afternoon sector
The afternoon Joule heating hot spot has been studied statistically by using the EISCAT Svalbard Radar (ESR) measurements at 75.4° Corrected Geomagnetic latitude (CGMLAT) and the OMNI solar wind data base. For a small subset of events, the Active Magnetosphere and Planetary Electrodynamics Response...
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ftleicesterunfig:oai:figshare.com:article/10196414 2023-05-15T16:04:48+02:00 Joule heating hot spot at high latitudes in the afternoon sector L. Cai A. T. Aikio S. E Milan 2016-07-25T00:00:00Z https://figshare.com/articles/journal_contribution/Joule_heating_hot_spot_at_high_latitudes_in_the_afternoon_sector/10196414 unknown 2381/38604 https://figshare.com/articles/journal_contribution/Joule_heating_hot_spot_at_high_latitudes_in_the_afternoon_sector/10196414 All Rights Reserved Uncategorized Joule heating field-aligned current solar wind effect afternoon hot spot high-latitude ionosphere ionospheric plasma convection Text Journal contribution 2016 ftleicesterunfig 2021-11-11T19:38:19Z The afternoon Joule heating hot spot has been studied statistically by using the EISCAT Svalbard Radar (ESR) measurements at 75.4° Corrected Geomagnetic latitude (CGMLAT) and the OMNI solar wind data base. For a small subset of events, the Active Magnetosphere and Planetary Electrodynamics Response Experiment (AMPERE) field-aligned current distributions have been available. The main results are as follows. Afternoon Joule heating hot spots are associated with high values of ionospheric electric fields and slightly enhanced Pedersen conductances. The Joule heating hot spot values are larger in summer than in winter, which can be explained by the higher Pedersen conductances during summer than winter. The afternoon Joule heating hot spots are located close to the reversals of the large-scale field-aligned current systems. The most common location is close to the Region 1/Region 2 boundary and those events are associated with sunward convecting F region plasma. In a few cases, the hot spots take place close to the Region 1/Region 0 boundary and then the ionospheric plasma is convecting antisunward. The hot spots may occur both during slow (<450 km/s) and high (>450 km/s) speed solar wind conditions. During slow-speed solar wind events, the dominant interplanetary magnetic field (IMF) direction is southward, which is the general requirement for the low-latitude magnetic merging at the dayside magnetopause. During high-speed solar wind, also northward IMF conditions appear, but those are associated with large values of the IMF |By| component, making again the dayside magnetopause merging possible. Finally, the measured afternoon hot spot Joule heating rates are not a linear function of the solar wind energy coupling function. Other Non-Article Part of Journal/Newspaper EISCAT Svalbard University of Leicester: Figshare Omni ENVELOPE(144.232,144.232,59.863,59.863) Pedersen ENVELOPE(140.013,140.013,-66.668,-66.668) Svalbard |
institution |
Open Polar |
collection |
University of Leicester: Figshare |
op_collection_id |
ftleicesterunfig |
language |
unknown |
topic |
Uncategorized Joule heating field-aligned current solar wind effect afternoon hot spot high-latitude ionosphere ionospheric plasma convection |
spellingShingle |
Uncategorized Joule heating field-aligned current solar wind effect afternoon hot spot high-latitude ionosphere ionospheric plasma convection L. Cai A. T. Aikio S. E Milan Joule heating hot spot at high latitudes in the afternoon sector |
topic_facet |
Uncategorized Joule heating field-aligned current solar wind effect afternoon hot spot high-latitude ionosphere ionospheric plasma convection |
description |
The afternoon Joule heating hot spot has been studied statistically by using the EISCAT Svalbard Radar (ESR) measurements at 75.4° Corrected Geomagnetic latitude (CGMLAT) and the OMNI solar wind data base. For a small subset of events, the Active Magnetosphere and Planetary Electrodynamics Response Experiment (AMPERE) field-aligned current distributions have been available. The main results are as follows. Afternoon Joule heating hot spots are associated with high values of ionospheric electric fields and slightly enhanced Pedersen conductances. The Joule heating hot spot values are larger in summer than in winter, which can be explained by the higher Pedersen conductances during summer than winter. The afternoon Joule heating hot spots are located close to the reversals of the large-scale field-aligned current systems. The most common location is close to the Region 1/Region 2 boundary and those events are associated with sunward convecting F region plasma. In a few cases, the hot spots take place close to the Region 1/Region 0 boundary and then the ionospheric plasma is convecting antisunward. The hot spots may occur both during slow (<450 km/s) and high (>450 km/s) speed solar wind conditions. During slow-speed solar wind events, the dominant interplanetary magnetic field (IMF) direction is southward, which is the general requirement for the low-latitude magnetic merging at the dayside magnetopause. During high-speed solar wind, also northward IMF conditions appear, but those are associated with large values of the IMF |By| component, making again the dayside magnetopause merging possible. Finally, the measured afternoon hot spot Joule heating rates are not a linear function of the solar wind energy coupling function. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
L. Cai A. T. Aikio S. E Milan |
author_facet |
L. Cai A. T. Aikio S. E Milan |
author_sort |
L. Cai |
title |
Joule heating hot spot at high latitudes in the afternoon sector |
title_short |
Joule heating hot spot at high latitudes in the afternoon sector |
title_full |
Joule heating hot spot at high latitudes in the afternoon sector |
title_fullStr |
Joule heating hot spot at high latitudes in the afternoon sector |
title_full_unstemmed |
Joule heating hot spot at high latitudes in the afternoon sector |
title_sort |
joule heating hot spot at high latitudes in the afternoon sector |
publishDate |
2016 |
url |
https://figshare.com/articles/journal_contribution/Joule_heating_hot_spot_at_high_latitudes_in_the_afternoon_sector/10196414 |
long_lat |
ENVELOPE(144.232,144.232,59.863,59.863) ENVELOPE(140.013,140.013,-66.668,-66.668) |
geographic |
Omni Pedersen Svalbard |
geographic_facet |
Omni Pedersen Svalbard |
genre |
EISCAT Svalbard |
genre_facet |
EISCAT Svalbard |
op_relation |
2381/38604 https://figshare.com/articles/journal_contribution/Joule_heating_hot_spot_at_high_latitudes_in_the_afternoon_sector/10196414 |
op_rights |
All Rights Reserved |
_version_ |
1766400432947593216 |