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High resolution measurements and modeling of auroral hydrogen emission line profiles

Record type: Article

Measurements in the visible wavelength range at high spectral resolution (1.3 A° ) have been made at Longyearbyen, Svalbard (15.8 E,78.2 N) during an interval of intense proton precipitation. The shape and Doppler shift of hydrogen Balmer beta line profiles have been compared with model line profiles, using as input ion energy spectra from almost coincident passes of the FAST and DMSP spacecraft. The comparison shows that the simulation contains the important physical processes that produce the profiles, and confirms that measured changes in the shape and peak wavelength of the hydrogen profiles are the result of changing energy input. This combination of high resolution measurements with modeling provides a method of estimating the incoming energy and changes in flux of precipitating protons over Svalbard, for given energy and pitch-angle distributions. Whereas for electron precipitation, information on the incident particles is derived from brightness and brightness ratios which require at least two spectral windows, for proton precipitation the Doppler profile of resulting hydrogen emission is directly related to the energy and energy flux of the incident energetic protons and can be used to gather information about the source region. As well as the expected Doppler shift to shorter wavelengths, the measured profiles have a significant red-shifted component, the result of upward flowing emitting hydrogen atoms.

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Citation

Lanchester, B.S., Galand, M., Robertson, S.C., Rees, M.H., Lummerzheim, D., Furniss, I., Peticolas, L.M., Frey, H.U., Mendillo, M. and Baumgardner, J. (2003) High resolution measurements and modeling of auroral hydrogen emission line profiles Annales Geophysicae, 21, (7), pp. 1629-1643.

More information

Published date: 2003
Keywords: ionosphere (auroral ionosphere, particle precipitation). magnetospheric physics (auroral phenomena)

Identifiers

Local EPrints ID: 37633
URI: http://eprints.soton.ac.uk/id/eprint/37633
ISSN: 0992-7689
PURE UUID: 225097cb-1f42-4659-bc57-417de488a332

Catalogue record

Date deposited: 24 May 2006
Last modified: 17 Jul 2017 15:41

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Contributors

Author: B.S. Lanchester
Author: M. Galand
Author: S.C. Robertson
Author: M.H. Rees
Author: D. Lummerzheim
Author: I. Furniss
Author: L.M. Peticolas
Author: H.U. Frey
Author: M. Mendillo
Author: J. Baumgardner

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