Forbush decreases - Origin and development in the interplanetary space

Details Forbush decreases - Origin and development in the interplanetary space Forbush decreases - Origin and development in the interplanetary space

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ncimc...2....1i&link_type=abstract

Nuovo Cimento C, Serie 1, vol. 2C, Jan.-Feb. 1979, p. 1-52. Research supported by the Consiglio Nazionale delle Ricerche.

Computer Science

76

Forbush Decreases, Interplanetary Space, Tables (Data), Type 4 Bursts, Cosmic Rays, Earth Orbits, Interplanetary Magnetic Fields, Solar Flares, Solar Orbits, Time Constant

Scientific paper

High-latitude neutron-monitor data on all Forbush decreases (FDs) that occurred in the period from 1957 to 1969 are used, together with solar radio observations, to investigate the origin and spatiotemporal evolution of the FDs. It is found that: (1) solar flares accompanied by energetic type IV radio emission produce FDs; (2) the FD amplitude as observed at earth is related to the heliolongitude of the parent flare and the total energy involved in the type IV burst; (3) FD transit time and recovery phase at earth are also associated with the heliolongitude of the parent flare; (4) the FD-modulated region is essentially a spiral conelike region that extends along interplanetary lines of magnetic force from the sun to the radially advancing shock front generated by the parent flare; (5) the modulated region is 100 to 200 deg wide in both latitude and longitude, with a zone of maximum cosmic-ray depression of at least 60 deg located near the western edge; and (6) the cosmic-ray intensity within the modulated region recovers quasi-exponentially to an unperturbed level with a time constant of approximately 11 days.

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