Simultaneous observations of the main trough using GPS imaging and the EISCAT radar
We use a digisonde at Jicamarca and a chain of GPS receivers on the west side of South America to investigate the effects of the pre-reversal enhancement (PRE) in E x B drift, the asymmetry ( I a ) of equatorial ionization anomaly (EIA), and the magnetic activity ( K p ) on the generation of equator...
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Online Access: | https://doi.org/10.5194/angeo-23-753-2005 https://angeo.copernicus.org/articles/23/753/2005/ |
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ftcopernicus:oai:publications.copernicus.org:angeo35418 2023-05-15T16:04:45+02:00 Simultaneous observations of the main trough using GPS imaging and the EISCAT radar Meggs, R. W. Mitchell, C. N. Howells, V. S. C. 2018-09-27 application/pdf https://doi.org/10.5194/angeo-23-753-2005 https://angeo.copernicus.org/articles/23/753/2005/ eng eng doi:10.5194/angeo-23-753-2005 https://angeo.copernicus.org/articles/23/753/2005/ eISSN: 1432-0576 Text 2018 ftcopernicus https://doi.org/10.5194/angeo-23-753-2005 2020-07-20T16:27:28Z We use a digisonde at Jicamarca and a chain of GPS receivers on the west side of South America to investigate the effects of the pre-reversal enhancement (PRE) in E x B drift, the asymmetry ( I a ) of equatorial ionization anomaly (EIA), and the magnetic activity ( K p ) on the generation of equatorial spread F (ESF). Results show that the ESF appears frequently in summer (November, December, January, and February) and equinoctial (March, April, September, and October) months, but rarely in winter (May, June, July, and August) months. The seasonal variation in the ESF is associated with those in the PRE E x B drift and I a . The larger E x B drift (>20m/s) and smaller | I a | (<0.3) in summer and equinoctial months provide a preferable condition to development the ESF. Conversely, the smaller E x B drift and larger | I a | are responsible for the lower ESF occurrence in winter months. Regarding the effects of magnetic activity, the ESF occurrence decreases with increasing K p in the equinoctial and winter months, but not in the summer months. Furthermore, the larger and smaller E x B drifts are presented under the quiet ( K p <3) and disturbed ( K p ≥3) conditions, respectively. These results indicate that the suppression in ESF and the decrease in E x B drifts are mainly caused by the decrease in the eastward electric field. Text EISCAT Copernicus Publications: E-Journals Eia ENVELOPE(7.755,7.755,63.024,63.024) Annales Geophysicae 23 3 753 757 |
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Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
We use a digisonde at Jicamarca and a chain of GPS receivers on the west side of South America to investigate the effects of the pre-reversal enhancement (PRE) in E x B drift, the asymmetry ( I a ) of equatorial ionization anomaly (EIA), and the magnetic activity ( K p ) on the generation of equatorial spread F (ESF). Results show that the ESF appears frequently in summer (November, December, January, and February) and equinoctial (March, April, September, and October) months, but rarely in winter (May, June, July, and August) months. The seasonal variation in the ESF is associated with those in the PRE E x B drift and I a . The larger E x B drift (>20m/s) and smaller | I a | (<0.3) in summer and equinoctial months provide a preferable condition to development the ESF. Conversely, the smaller E x B drift and larger | I a | are responsible for the lower ESF occurrence in winter months. Regarding the effects of magnetic activity, the ESF occurrence decreases with increasing K p in the equinoctial and winter months, but not in the summer months. Furthermore, the larger and smaller E x B drifts are presented under the quiet ( K p <3) and disturbed ( K p ≥3) conditions, respectively. These results indicate that the suppression in ESF and the decrease in E x B drifts are mainly caused by the decrease in the eastward electric field. |
format |
Text |
author |
Meggs, R. W. Mitchell, C. N. Howells, V. S. C. |
spellingShingle |
Meggs, R. W. Mitchell, C. N. Howells, V. S. C. Simultaneous observations of the main trough using GPS imaging and the EISCAT radar |
author_facet |
Meggs, R. W. Mitchell, C. N. Howells, V. S. C. |
author_sort |
Meggs, R. W. |
title |
Simultaneous observations of the main trough using GPS imaging and the EISCAT radar |
title_short |
Simultaneous observations of the main trough using GPS imaging and the EISCAT radar |
title_full |
Simultaneous observations of the main trough using GPS imaging and the EISCAT radar |
title_fullStr |
Simultaneous observations of the main trough using GPS imaging and the EISCAT radar |
title_full_unstemmed |
Simultaneous observations of the main trough using GPS imaging and the EISCAT radar |
title_sort |
simultaneous observations of the main trough using gps imaging and the eiscat radar |
publishDate |
2018 |
url |
https://doi.org/10.5194/angeo-23-753-2005 https://angeo.copernicus.org/articles/23/753/2005/ |
long_lat |
ENVELOPE(7.755,7.755,63.024,63.024) |
geographic |
Eia |
geographic_facet |
Eia |
genre |
EISCAT |
genre_facet |
EISCAT |
op_source |
eISSN: 1432-0576 |
op_relation |
doi:10.5194/angeo-23-753-2005 https://angeo.copernicus.org/articles/23/753/2005/ |
op_doi |
https://doi.org/10.5194/angeo-23-753-2005 |
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Annales Geophysicae |
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23 |
container_issue |
3 |
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753 |
op_container_end_page |
757 |
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1766400383229362176 |