Anisotropy measurements of nearly 50 KeV solar protons

Details Anisotropy measurements of nearly 50 KeV solar protons Anisotropy measurements of nearly 50 KeV solar protons

Aug 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975icrc....5.1801g&link_type=abstract

In: International Cosmic Ray Conference, 14th, Munich, West Germany, August 15-29, 1975, Conference Papers. Volume 5. (A76-26851

Mathematics

1

Angular Distribution, Anisotropy, Distribution Functions, Explorer 47 Satellite, Proton Energy, Solar Protons, Compton Effect, Energy Spectra, Interplanetary Medium, Solar Wind Velocity, Spatial Distribution, Transformations (Mathematics)

Scientific paper

The Energetic Particles Experiment on IMP-7 measures the angular distribution of 50-200 keV solar protons in 16 sectors. The velocity of 50 keV protons may be less than 5 times that of the solar wind. A generalized nonlinear Compton-Getting point transformation into the co-moving frame that contains no assumptions as to the angular distribution of either the spectrum or intensity is presented. Nearly 50 keV proton data in the spacecraft frame exhibit an anisotropy ratio that is large (not less than 5) and radial throughout the October 29, 1972 event lasting more than 9 days at this energy. This anisotropy argues against impulsive injection and diffusive decay in the inner solar system. Application of the transformation to the data reveals a long lasting residual anisotropy in the co-moving frame with protons streaming from the sun. Differences between the co-moving frame and solar wind frame velocities suggest residual electric fields upstream from the bow shock.

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