Giant transient decreases of cosmic rays in the outer heliosphere in September 1991

Details Giant transient decreases of cosmic rays in the outer heliosphere in September 1991 Giant transient decreases of cosmic rays in the outer heliosphere in September 1991

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.7821w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A5, p. 7821-7825.

Astronomy and Astrophysics

Astronomy

37

Galactic Cosmic Rays, Heliosphere, Solar Activity Effects, Solar Terrestrial Interactions, Spaceborne Astronomy, Time Dependence

Scientific paper

Large transient decreases over 20 percent were observed above 70 MeV cosmic ray intensity in September 1991, at the three spacecraft, V1, V2, and P10, in the outer heliosphere between 35 and 53 AU. These decreases appear to be related to the intense solar activity occurring in late May and early June, which was responsible for a series of rapid transient decreases at the earth that probably reduced the over 70-MeV intensity by more than 50 percent to the 1owest level ever recorded. Average transit speeds of about 600 to 800 km/s are deduced for the propagation of these transients between the earth and the outer heliosphere. The overall picture of the propagation of these transients is consistent with a massive, almost spherical modulating region moving outward in the heliosphere. The smooth almost exponential recovery of intensities at all three spacecraft for over 160 days after the decrease, and the large total modulation beyond P10 at the time of the decrease, suggest that the modulation boundary is well beyond 53 AU and probably beyond 100 AU.

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