D.: Proton and electron precipitation over Svalbard -first results from a new Imaging Spectrograph (HiTIES), in
Abstract. An unusually intense energetic proton precipita-tion event occurred on 26 November 2000. The resulting sur-face brightness of Hydrogen beta amounted to several hun-dred Rayleighs. This made it possible to examine the line profile at 1.3 A ̊ resolution in 60 s exposures for several hours in...
| Main Authors: | , , , , , , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
| Published: |
2003
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| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.505.1622 http://www.sp.ph.ic.ac.uk/~mgaland/Lanchester_Oulu_2003.pdf |
| Summary: | Abstract. An unusually intense energetic proton precipita-tion event occurred on 26 November 2000. The resulting sur-face brightness of Hydrogen beta amounted to several hun-dred Rayleighs. This made it possible to examine the line profile at 1.3 A ̊ resolution in 60 s exposures for several hours in the magnetic zenith, a combination of spectral and tempo-ral resolution not previously achieved. We confirm the ex-istence of a significant red-shifted component, the result of upward flowing emitting hydrogen atoms. The N+ 2 1N (1,3) filter showed, in addition to the nitrogen ion band, several lines of the atomic oxygen ion of the (4P–4D) multiplet 1. The Doppler profile indicates that the incident proton spec-trum must have been in the range of a few hundred eV to perhaps a few keV energy, a conjecture corroborated by near-coincident (in time and space) measurements of proton spec-tra from the DMSP F12 and FAST satellites. 1 |
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