IMAGE; Far Ultraviolet instrument; FUV; aurora; quantitative; proton; electron; flux and energy
Abstract :
[en] Direct imaging of the magnetosphere by instruments on the IMAGE spacecraft is supplemented by simultaneous observations of the global aurora in three far ultraviolet (FUV) wavelength bands. The purpose of the multi-wavelength imaging is to study the global auroral particle and energy input from the magnetosphere into the atmosphere. This paper describes the method for quantitative interpretation of FUV measurements. The Wide-Band Imaging Camera (WIC) provides broad band ultraviolet images of the aurora with maximum spatial resolution by imaging the nitrogen lines and bands between 140 and 180 nm wavelength. The Spectrographic Imager (SI), a dual wavelength monochromatic instrument, images both Doppler-shifted Lyman-alpha emissions produced by precipitating protons, in the SI-12 channel and OI 135.6 nm emissions in the SI-13 channel. From the SI-12 Doppler shifted Lyman-alpha images it is possible to obtain the precipitating proton flux provided assumptions are made regarding the mean energy of the protons. Knowledge of the proton (flux and energy) component allows the calculation of the contribution produced by protons in the WIC and SI-13 instruments. Comparison of the corrected WIC and SI-13 signals provides a measure of the electron mean energy, which can then be used to determine the electron energy flux. To accomplish this, reliable emission modeling and instrument calibrations are required. In-flight calibration using early-type stars was used to validate the pre-flight laboratory calibrations and determine long-term trends in sensitivity. In general, very reasonable agreement is found between in-situ measurements and remote quantitative determinations.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Frey, H. U.; Space Sciences Laboratory, University of California Berkeley, Berkeley, CA 94720, USA
Mende, S. B.
Immel, T. J.; Space Sciences Laboratory, University of California Berkeley, Berkeley, CA 94720, USA
Gérard, Jean-Claude ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Hubert, Benoît ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Habraken, Serge ; Université de Liège - ULiège > Département de physique > Optique - Hololab - CSL (Centre Spatial de Liège)
Spann, J.; Centre Spatial de Liège, B-4031 Liège, Belgium
Gladstone, G. R.; NASA George C. Marshall Space Flight Center, Huntsville, AL 35812, USA
Bisikalo, D. V.; Southwest Research Institute, San Antonio, TX 78228, USA
Shematovich, V. I.; Institute of Astronomy, Russian Academy of Sciences, Moscow, Russia
Language :
English
Title :
Summary of quantitative interpretation of IMAGE far ultraviolet auroral data
Publication date :
01 October 2003
Journal title :
Space Science Reviews
ISSN :
0038-6308
eISSN :
1572-9672
Publisher :
Springer Science & Business Media B.V., Dordrecht, Netherlands
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