A Statistical study of the Doppler spectral width of high-latitude ionospheric F-region echoes recorded with SuperDARN coherent HF radars
The HF radars of the Super Dual Auroral Radar Network (SuperDARN) provide measurements of the <b><i>E</i></b> × <b><i>B</i></b> drift of ionospheric plasma over extended regions of the high-latitude ionosphere. We have conducted a statistical stu...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2002-11-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/20/1769/2002/angeo-20-1769-2002.pdf |
| _version_ | 1819209966893924352 |
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| author | J.-P. Villain J.-P. Villain R. André M. Pinnock R. A. Greenwald C. Hanuise C. Hanuise |
| author_facet | J.-P. Villain J.-P. Villain R. André M. Pinnock R. A. Greenwald C. Hanuise C. Hanuise |
| author_sort | J.-P. Villain |
| collection | DOAJ |
| description | The HF radars of the Super Dual Auroral
Radar Network (SuperDARN) provide measurements of the <b><i>E</i></b> × <b><i>B</i></b>
drift of ionospheric plasma over extended regions of the high-latitude
ionosphere. We have conducted a statistical study of the associated Doppler
spectral width of ionospheric F-region echoes. The study has been conducted
with all available radars from the Northern Hemisphere for 2 specific periods
of time. Period 1 corresponds to the winter months of 1994, while period 2
covers October 1996 to March 1997. The distributions of data points and average
spectral width are presented as a function of Magnetic Latitude and Magnetic
Local Time. The databases are very consistent and exhibit the same features.
The most stringent features are: a region of very high spectral width,
collocated with the ionospheric LLBL/cusp/mantle region; an oval shaped region
of high spectral width, whose equator-ward boundary matches the poleward limit
of the Holzworth and Meng auroral oval. A simulation has been conducted to
evaluate the geometrical and instrumental effects on the spectral width. It
shows that these effects cannot account for the observed spectral features. It
is then concluded that these specific spectral width characteristics are the
signature of ionospheric/magnetospheric coupling phenomena.<br><br><b>Key words.</b> Ionosphere (auroral ionosphere;
ionosphere-magnetosphere interactions; ionospheric irregularities) |
| first_indexed | 2024-12-23T06:03:41Z |
| format | Article |
| id | doaj.art-160fd6ed083940ff9fe92fc383152312 |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-23T06:03:41Z |
| publishDate | 2002-11-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-160fd6ed083940ff9fe92fc3831523122022-12-21T17:57:36ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762002-11-01201769178110.5194/angeo-20-1769-2002A Statistical study of the Doppler spectral width of high-latitude ionospheric F-region echoes recorded with SuperDARN coherent HF radarsJ.-P. Villain0J.-P. Villain1R. André2M. Pinnock3R. A. Greenwald4C. Hanuise5C. Hanuise6LPCE/CNRS, 3A Av. de la Recherche Scientifique, 45071 Orléans Cedex, FranceCorrespondence to: J.-P. Villain (jvillain@cnrs-orleans.fr)LPCE/CNRS, 3A Av. de la Recherche Scientifique, 45071 Orléans Cedex, FranceBritish Antarctic Survey, High Cross, Madingley Road, CB3 OET Cambridge, UKThe Johns Hopkins University, Applied Physics Laboratory, Laurel, Maryland, USAnow at LPCE/CNRSLSEET/CNRS, Université de Toulon et du Var, BP 132, 83957 La Garde Cedex, FranceThe HF radars of the Super Dual Auroral Radar Network (SuperDARN) provide measurements of the <b><i>E</i></b> × <b><i>B</i></b> drift of ionospheric plasma over extended regions of the high-latitude ionosphere. We have conducted a statistical study of the associated Doppler spectral width of ionospheric F-region echoes. The study has been conducted with all available radars from the Northern Hemisphere for 2 specific periods of time. Period 1 corresponds to the winter months of 1994, while period 2 covers October 1996 to March 1997. The distributions of data points and average spectral width are presented as a function of Magnetic Latitude and Magnetic Local Time. The databases are very consistent and exhibit the same features. The most stringent features are: a region of very high spectral width, collocated with the ionospheric LLBL/cusp/mantle region; an oval shaped region of high spectral width, whose equator-ward boundary matches the poleward limit of the Holzworth and Meng auroral oval. A simulation has been conducted to evaluate the geometrical and instrumental effects on the spectral width. It shows that these effects cannot account for the observed spectral features. It is then concluded that these specific spectral width characteristics are the signature of ionospheric/magnetospheric coupling phenomena.<br><br><b>Key words.</b> Ionosphere (auroral ionosphere; ionosphere-magnetosphere interactions; ionospheric irregularities)https://www.ann-geophys.net/20/1769/2002/angeo-20-1769-2002.pdf |
| spellingShingle | J.-P. Villain J.-P. Villain R. André M. Pinnock R. A. Greenwald C. Hanuise C. Hanuise A Statistical study of the Doppler spectral width of high-latitude ionospheric F-region echoes recorded with SuperDARN coherent HF radars Annales Geophysicae |
| title | A Statistical study of the Doppler spectral width of high-latitude ionospheric F-region echoes recorded with SuperDARN coherent HF radars |
| title_full | A Statistical study of the Doppler spectral width of high-latitude ionospheric F-region echoes recorded with SuperDARN coherent HF radars |
| title_fullStr | A Statistical study of the Doppler spectral width of high-latitude ionospheric F-region echoes recorded with SuperDARN coherent HF radars |
| title_full_unstemmed | A Statistical study of the Doppler spectral width of high-latitude ionospheric F-region echoes recorded with SuperDARN coherent HF radars |
| title_short | A Statistical study of the Doppler spectral width of high-latitude ionospheric F-region echoes recorded with SuperDARN coherent HF radars |
| title_sort | statistical study of the doppler spectral width of high latitude ionospheric f region echoes recorded with superdarn coherent hf radars |
| url | https://www.ann-geophys.net/20/1769/2002/angeo-20-1769-2002.pdf |
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