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| Titel |
On the use of IMAGE FUV for estimating the latitude of the open/closed magnetic field line boundary in the ionosphere |
| VerfasserIn |
P. D. Boakes, S. E. Milan, G. A. Abel, M. P. Freeman, G. Chisham, B. Hubert, T. Sotirelis |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 26, no. 9 ; Nr. 26, no. 9 (2008-09-16), S.2759-2769 |
| Datensatznummer |
250016225
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| Publikation (Nr.) |
 copernicus.org/angeo-26-2759-2008.pdf |
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| Zusammenfassung |
| A statistical comparison of the latitude of the open/closed magnetic field
line boundary (OCB) as estimated from the three far ultraviolet (FUV)
detectors onboard the IMAGE spacecraft (the Wideband Imaging camera, WIC,
and the Spectrographic Imagers, SI-12 and SI-13) has been carried out over
all magnetic local times. A total of over 400 000 OCB estimations were
compared from December 2000 and January and December of 2001–2002. The modal
latitude difference between the FUV OCB proxies from the three detectors is
small, <1°, except in the predawn and evening sectors, where the
SI-12 OCB proxy is found to be displaced from both the SI-13 and WIC OCB
proxies by up to 2° poleward in the predawn sector and by up to 2°
equatorward in the evening sector. Comparing the IMAGE FUV OCB proxies with
that determined from particle precipitation measurements by the Defense
Meteorological Satellites Program (DMSP) also shows systematic differences.
The SI-12 OCB proxy is found to be at higher latitude in the predawn sector,
in better agreement with the DMSP OCB proxy. The WIC and SI-13 OCB proxies
are found to be in better agreement with the DMSP OCB proxy at most other
magnetic local times. These systematic offsets may be used to correct FUV
OCB proxies to give a more accurate estimate of the OCB latitude. |
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