Short-term cosmic-ray increases and magnetic cloud-like structures during Forbush decreases

Details Short-term cosmic-ray increases and magnetic cloud-like structures during Forbush decreases Short-term cosmic-ray increases and magnetic cloud-like structures during Forbush decreases

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26as...81..367i&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 81, no. 3, Dec. 1989, p. 367-391.

Astronomy and Astrophysics

Astrophysics

11

Cosmic Rays, Forbush Decreases, Interplanetary Medium, Magnetic Clouds, Solar Terrestrial Interactions, Magnetic Flux, Solar Wind Velocity

Scientific paper

The analysis of the nucleonic intensity recorded during Forbush decreases (amplitude equal to or greater than 1.5 percent at high-latitude stations), occurring in the period 1966-1979, allowed identification of 49 short-term cosmic ray increases (STIs) of nonsolar and nongeomagnetic origin, with time duration from 5 to 30 hours. They show often a large North-South anisotropy and begin 4 to 40 hours after the interplanetary shock arrival; moreover they take place during the passage at the earth of peculiar solar wind structures characterized by cold material (about 60,000 K), high speed solar wind (470 km/s or greater), intense magnetic field strength (B equal to or greater than 10 nT) and large changes in the B-direction which appear mainly as a quasi-continuous rotation of the B-component on a plane. The characteristics of these interplanetary regions are consistent with those of magnetic cloud structures strongly related with the driver gas ejected by the sun. The high number of cosmic ray short-term increases seems to suggest that these increases are common features of flare-related interplanetary perturbations producing Forbush decreases.

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