Corotating energetic particle and fast plasma streams in the inner and outer solar system: Radial dependence and energy spectra

Details Corotating energetic particle and fast plasma streams in the inner and outer solar system: Radial dependence and energy spectra Corotating energetic particle and fast plasma streams in the inner and outer solar system: Radial dependence and energy spectra

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979cepf.book.....v&link_type=abstract

NASA Tech. Memo., NASA-TM--79700, 17 p.

Physics

1

Energetic Particles, Interplanetary Medium, Plasma Acceleration, Solar Wind Velocity, Energy Spectra, Plasma Interactions, Power Spectra, Shock Wave Interaction

Scientific paper

Interplanetary acceleration processes are shown as the most plausible explanation for the observed corotating energetic particle events. The relation between the energetic particle events and the properties of the high speed solar wind streams observed at 1 AU were investigated along with the form of the energy spectrum of the corotating energetic particle streams and its variation with respect to CIR boundaries and with radial distance. It is shown that: (1) at 1 AU a correlation exists between the j particle intensity and the solar wind velocity measured during the rising part of the event, of the form I is proportional to exp (Vsw/V sub o); and (2) the energy spectra from .5 to 20 MeV are well represented by an exponential in momentum of the form dJ/dP = C exp (-P/Po). This representation is found to apply from .45 AU to beyond 5 AU. The variation of Po with respect to the CIR boundaries was studied using a method of superposed epoch analysis. It is shown that at 1 AU the spectrum remains constant during the first two days and then progressively flattens; between 3-4AU.

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