Climatology of the inter-hemispheric field-aligned current system in the equatorial ionosphere as observed by CHAMP
From geomagnetic field observations of CHAMP during 2001–2009 we extracted characteristic signatures of inter-hemispheric field-aligned currents (IHFACs) in the equatorial ionosphere. The results are in general agreement with previous observations. Nighttime IHFACs are negligibly small. Solstitia...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2011-03-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/29/573/2011/angeo-29-573-2011.pdf |
| _version_ | 1819258995817316352 |
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| author | J. Park H. Lühr K. W. Min |
| author_facet | J. Park H. Lühr K. W. Min |
| author_sort | J. Park |
| collection | DOAJ |
| description | From geomagnetic field observations of CHAMP during 2001–2009 we extracted
characteristic signatures of inter-hemispheric field-aligned currents
(IHFACs) in the equatorial ionosphere. The results are in general agreement
with previous observations. Nighttime IHFACs are negligibly small. Solstitial
IHFACs flow from the summer to winter (from winter to summer) hemisphere at
dawn (around noon). Duskside IHFACs flow southbound irrespective of season.
We have also found some new IHFAC properties, which may have been predicted
by theories, but are not yet given observational support. IHFACs clearly
exhibit a longitude dependence, which is modulated by the South Atlantic
Anomaly, the offset between geographic and magnetic equators, and tidal
waves. IHFACs show little dependence on the solar cycle. We provide a
comprehensive assessment of the IHFAC modulation by non-migrating tides. |
| first_indexed | 2024-12-23T19:02:59Z |
| format | Article |
| id | doaj.art-995c2b111c044a219890342230c9ede5 |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-23T19:02:59Z |
| publishDate | 2011-03-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-995c2b111c044a219890342230c9ede52022-12-21T17:34:40ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762011-03-012957358210.5194/angeo-29-573-2011Climatology of the inter-hemispheric field-aligned current system in the equatorial ionosphere as observed by CHAMPJ. Park0H. Lühr1K. W. Min2GFZ, German Research Center for Geosciences, Potsdam, GermanyGFZ, German Research Center for Geosciences, Potsdam, GermanyDepartment of Physics, Korea Advanced Institute of Science and Technology, Daejeon, KoreaFrom geomagnetic field observations of CHAMP during 2001–2009 we extracted characteristic signatures of inter-hemispheric field-aligned currents (IHFACs) in the equatorial ionosphere. The results are in general agreement with previous observations. Nighttime IHFACs are negligibly small. Solstitial IHFACs flow from the summer to winter (from winter to summer) hemisphere at dawn (around noon). Duskside IHFACs flow southbound irrespective of season. We have also found some new IHFAC properties, which may have been predicted by theories, but are not yet given observational support. IHFACs clearly exhibit a longitude dependence, which is modulated by the South Atlantic Anomaly, the offset between geographic and magnetic equators, and tidal waves. IHFACs show little dependence on the solar cycle. We provide a comprehensive assessment of the IHFAC modulation by non-migrating tides.https://www.ann-geophys.net/29/573/2011/angeo-29-573-2011.pdf |
| spellingShingle | J. Park H. Lühr K. W. Min Climatology of the inter-hemispheric field-aligned current system in the equatorial ionosphere as observed by CHAMP Annales Geophysicae |
| title | Climatology of the inter-hemispheric field-aligned current system in the equatorial ionosphere as observed by CHAMP |
| title_full | Climatology of the inter-hemispheric field-aligned current system in the equatorial ionosphere as observed by CHAMP |
| title_fullStr | Climatology of the inter-hemispheric field-aligned current system in the equatorial ionosphere as observed by CHAMP |
| title_full_unstemmed | Climatology of the inter-hemispheric field-aligned current system in the equatorial ionosphere as observed by CHAMP |
| title_short | Climatology of the inter-hemispheric field-aligned current system in the equatorial ionosphere as observed by CHAMP |
| title_sort | climatology of the inter hemispheric field aligned current system in the equatorial ionosphere as observed by champ |
| url | https://www.ann-geophys.net/29/573/2011/angeo-29-573-2011.pdf |
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