A study of the Forbush decrease effect: The origin and the development in the interplanetary space

Details A study of the Forbush decrease effect: The origin and the development in the interplanetary space A study of the Forbush decrease effect: The origin and the development in the interplanetary space

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977stin...7814974i&link_type=abstract

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Mathematics

Forbush Decreases, Interplanetary Space, Solar Flares, Type 4 Bursts, Amplitudes, Cosmic Rays, Mathematical Models, Neutron Counters, Perturbation, Time Dependence

Scientific paper

A catalogue of all Type IV radiobursts and all Forbush decreases (Fds) observed by neutron monitor stations at high latitude from July 1957 to December 1969 is presented. Only the Type IV, energetic and well extended in frequency, were found to produce Fds of appreciable amplitude. The dependences of the distinctive parameters of the Fds (amplitude, average sun-earth velocity, decreasing and recovery phases) on the coordinates of the parent Type IV solar flares are in agreement with those expected from the corotative model of Fds; the modulated region corotates with the sun and covers a wide portion of the interplanetary space: average extension approx. 130 deg with a region of approx. 70 deg of maximum cosmic ray depression (core) shifted towards the leading edge. The Fd amplitude in the core is found to be correlated with the average velocity of the perturbation between the sun and the earth's orbit and the intensity tends to recover with a time constant tau approx. 11 days. A study on the time behavior and on the amplitude distribution of the Fds not associated with observed Type IV solar flares shows that these events are mainly produced by Type IV occurring in the not visible hemisphere of the sun.

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