Quiet-time periods observed by EPHIN/SOHO during the minimum of the 22nd solar cycle

An analysis of the hydrogen and helium isotopic composition from EPHIN data, during the quiet-time period from January 1 to June 1, 1996, is presented. An isotopic discrimination and background rejection have been applied and relationships between the abundances of 2H/1H, 3He/4He, and 4He/1H have be...

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Bibliographic Details
Published in:Solar physics 2000-06, Vol.194 (2), p.405-413
Main Authors: Gómez-Herrero, Raúl, RodrÍguez-FrÍas, M. Dolores, del Peral, Luis, Sequeiros, Juan, Müller-Mellin, Reinhold, Kunow, Horst, Sierks, Holger
Format: Article
Language:English
Subjects:
Auroral kilometric radiation
Cosmic rays
Deuterium
Energy spectra
Heliosphere
Helium
Isotope composition
Solar cycle
Solar physics
Studies
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Summary:An analysis of the hydrogen and helium isotopic composition from EPHIN data, during the quiet-time period from January 1 to June 1, 1996, is presented. An isotopic discrimination and background rejection have been applied and relationships between the abundances of 2H/1H, 3He/4He, and 4He/1H have been calculated. The energy spectra in the 4–50 MeV nucl−1 range have been obtained and the contribution of the different spectral components have been analysed in this energy range. We conclude that the main contribution to the 4He spectrum is of anomalous origin, while the proton and 3He spectra have contributions mainly from particles of solar origin at low energies and from the galactic cosmic radiation modulated by the heliosphere at high energies. The deuterium spectrum is mainly of galactic origin.
ISSN:0038-0938
1573-093X
DOI:10.1023/A:1005244720379