NDLI: First Energetic Particle Events Observed by the ERNE Instrument

Content Provider	Springer Nature Link
Author	Torsti, J. Valtonen, E. Kocharov, L. G. Vainio, R. Riihonen, E. Anttila, A. Laitinen, T. Teittinen, M. Kuusela, J.
Copyright Year	1997
Abstract	The energetic particle instrument ERNE on-board SOHO started its observations on December 15, 1995. The low-energy sensor of ERNE, LED, is capable of measuring particles in the energy range from 1 to 10 MeV nucl$^{-1}$. From the beginning of the year 1996 until May 22, 1996, LED-observations included four energetic particle events above threshold intensities. An energetic particle event caused by a corotating interaction region that accelerated protons upto ∽ 10 MeV, was observed during January 20–25. Another similar particle event occured on May 6–12. The events were separated by four solar rotation periods. They had similar time profiles, but the one in May had a harder spectrum and a lower intensity level. The $^{4}$He-to-proton ratios were in accordance with the solar wind value. Energetic particles observed during April 22–23 and May 14–17 were accelerated at the Sun. The first one was apparently an outcome from an active region observed on the west limb by telescopes on-board SOHO. Protons were detected at energies from 1 to ∽10 MeV. For this event, the$^{4}$He-to-proton ratio in the range 1.5–5 MeV nucl$^{-1}$ was ∽ 3%. No $^{3}$He ions were detected. The period of May 14–15 was, in contrast, extremely $^{3}$He-rich: it had a$^{3}$He-to-proton ratio of 1.5 ± 0.6 and a $^{3}$He-to- $^{4He}$ ratio as high as ∽ 8. The period of May 14–17 comprised at least three individual, one-day-long events. The first two events were $^{3}$He-rich, while the last one seemed to have a normal composition.
Starting Page	179
Ending Page	191
Page Count	13
File Format	PDF
ISSN	00380938
Journal	Solar Physics
Volume Number	170
Issue Number	1
e-ISSN	1573093X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1997-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Astrophysics
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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