Other
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980georl...7..201s&link_type=abstract
Geophysical Research Letters, vol. 7, Mar. 1980, p. 201-204. NASA-supported research; Bundesministerium für Forschung und Techn
Other
36
Helium Plasma, Interplanetary Medium, Ionized Gases, Shock Wave Propagation, Cold Plasmas, Helios 1, Plasma Diagnostics, Rarefied Plasmas, Solar Protons
Scientific paper
The interplanetary shock wave observed on Jan. 29, 1977 by the HELIOS-1 plasma instruments shows an unusual feature: in the cold tenuous piston plasma following this shock, there appears a third peak in the energy per charge (E/q) spectra, in addition to the normal proton and alpha-particle peaks. The peak is located at E/q 4 and persists for about 14 hours, with slowly varying intensities. Independent simultaneous measurement of these particles' charge yields a value of approximately 1. These ions are thought to be He-4(+) ions travelling with the same speed as protons and alpha particles. The occurrence of He-4(+) indicates the possibility that during eruptive prominences or other solar transients, 'cold' chromospheric plasma might escape from the sun without undergoing the normal coronal heating process.
Muehlhaeuser K.-H.
Rosenbauer Helmut
Schwenn Rainer
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