The participation of nuclei in type-III-related electron streams

Details The participation of nuclei in type-III-related electron streams The participation of nuclei in type-III-related electron streams

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994soph..155..121k&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 155, no.1, p. 121-148

Physics

3

Alpha Particles, Electron Flux Density, Helium, Solar Corona, Type 3 Bursts, Data Reduction, Helios A, Helios B, Perihelions, Transit Time

Scientific paper

We study 27 increases of the flux of 300-800 keV electrons on board HELIOS A or B, associated with intense type III radio bursts close to perihelion passages of the two spacecraft, during the solar minimum. Electrons can be detected inside cones with an angular width between 30 deg and 60 deg. Though only intense type III bursts are associated with recognizable electron events in space, such an association does not exist for all of them; this fact and great differences in fluxes of the individual events indicate that, apart from the intensity, also some other characteristic of the type III burst acceleration or propagation process determines the resulting flux of electrons in space; the energy spectrum of the accelerated electrons is one of the likely candidates. A comparison of the electron flux in these events with the flux of 1.7-3.7 MeV/nucl helium reveals very large variations of the helium/electron flux ratio, by a factor of at least 15 and possibly much higher. We demonstrate that these variations are not caused by propagation effects in interplanetary space. Therefore, they must be due either to propagation effects in the solar corona, or more likely, to intrinsic variations in the relative production of electrons and nuclei in the type III burst process. An extrapolation of the observed fluxes to 1 AU shows that in only 7 of the 27 electron events studied might a marginal greater than 1.7 MeV helium flux be recognized at the Earth distance.

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