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Fluxes of MeV particles at Earth's orbit and their relationship with the global structure of the solar corona: Observations from SOHOThe SOHO satellite, launched on 2 December 1995, combines a unique set of instruments which allow comparative studies of the interior of the sun, the outer corona and solar to be carried out. In its halo orbit around the L1 Lagrangian point of the sun-earth system, SOHO's comprehensive suprathermal and energetic particle analyzer (COSTEP) measures in situ energetic particles in the energy range of 44 keV/particle to greater than 53 MeV/n. The MeV proton, electron and helium nuclei measurements from the COSTEP electron proton helium instrument (EPHIN) were used to investigate the relationships of intensity increases of these particle species with the large-scale structures of the solar corona and heliosphere, including temporal variations. Coronal observatons are provided by the large angle spectroscopic coronagraph (LASCO) and the extreme ultraviolet imaging telescope (EIT). It was found that during times of minimum solar activity, intensity increases of the particles have two well defined sources: corotating interaction regions (CIRs) in the heliosphere related to coronal holes at the sun and coronal mass ejections.
Document ID
19990056515
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Posner, A.
(Kiel Univ. Germany)
Bothmer, V.
(Kiel Univ. Germany)
Kunow, H.
(Kiel Univ. Germany)
Heber, B.
(Kiel Univ. Germany)
Mueller-Mellin, R.
(Kiel Univ. Germany)
Delaboudiniere, J.-P.
(Paris XI Univ. Orsay France)
Thompson, B. J.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Brueckner, G. E.
(Hulburt (E. O.) Center for Space Research Washington, DC United States)
Howard, R. A.
(Hulburt (E. O.) Center for Space Research Washington, DC United States)
Michels, D. J.
(Hulburt (E. O.) Center for Space Research Washington, DC United States)
Date Acquired
August 19, 2013
Publication Date
December 1, 1997
Publication Information
Publication: Proceedings of the 31st ESALB Symposium on Correlated Phenomena at the Sun, in the Heliosphere and in Geospace
Subject Category
Solar Physics
Distribution Limits
Public
Copyright
Other
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