Proton and electron precipitation over Svalbard: first results from a new imaging spectograph (HiTIES) (original) (raw)

2003

Abstract

Abstract. An unusually intense energetic proton precipita-tion event occurredon 26 November2000. The resulting sur-face brightness of Hydrogen beta amounted to several hun-dred Rayleighs. This made it possible to examine the lineprofile 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 ofupward flowing emitting hydrogen atoms. The N filter showed, in addition to the nitrogen ion band, several 1N (1,3)lines of the atomic oxygen ion of the ( P– D) multiplet 1.The Doppler profile indicates that the incident proton spec-trum must have been in the range of a few hundred eV toperhaps a few keV energy,a conjecturecorroboratedby near-coincident (in time and space) measurements of proton spec-tra from the DMSP F12 and FAST satellites. 1 Introduction A new instrumental platform has been installed at Longyear-byen onSva...

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