The November 1970 Forbush decrease investigation at the cut-off rigidity where the latitude curve changes its curvature

Details The November 1970 Forbush decrease investigation at the cut-off rigidity where the latitude curve changes its curvature The November 1970 Forbush decrease investigation at the cut-off rigidity where the latitude curve changes its curvature

Sep 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976p%26ss...24..835a&link_type=abstract

(European Space Agency, European Symposium on Cosmic Ray Physics, 4th, Frascati, Italy, Sept. 9-13, 1974.) Planetary and Space S

Physics

1

Forbush Decreases, Proton Protuberances, Solar Protons, Solar Wind Velocity, Magnetic Rigidity, Pioneer 8 Space Probe, Vela Satellites

Scientific paper

It is shown that a proton flare of importance 3B, which occurred on Nov. 5, 1970, was responsible for a Forbush decrease observed at ground level two days later, enhanced solar-wind velocities measured by the Vela and Pioneer 8 satellites, and a high-energy proton event observed by Pioneer 6. The observations are described, the profile of the Forbush decrease is plotted, and the variation of the primary spectrum at the Athens, Greece, cutoff rigidity during the Forbush decrease is plotted. It is found that the time coincidence of the Forbush-decrease minimum and the solar-wind velocity maximum at earth was negatively correlated, that a 'knee' in several curves corresponded to a threshold rigidity of about 2 GV, and that a typical latitude curve changed its sign of curvature at around 8 GV.

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