On the role of equatorial coronal holes in cosmic ray modulation

Details On the role of equatorial coronal holes in cosmic ray modulation On the role of equatorial coronal holes in cosmic ray modulation

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988angeo...6..377b&link_type=abstract

Annales Geophysicae (ISSN 0980-8752), vol. 6, Aug. 1988, p. 377-380.

Physics

9

Coronal Holes, Cosmic Rays, Solar Cycles, Solar Terrestrial Interactions, Heliosphere, Interplanetary Medium, Periodic Variations, Radiation Absorption

Scientific paper

A positive correlation has been found between the variation of cosmic ray intensity at the earth and the variation of polar coronal holes area over the solar cycle, but no satistactory explanation of this correlation has been put forward until now. In the present note it is suggested that such a correlation can be understood on the basis of a recent study (Hewish and Bravo, 1986), in which low-latitude coronal holes - more abundant and active when polar holes reduce their size, and almost absent when polar coronal holes are larger - were shown to be the origin of the major perturbations traveling in the interplanetary medium.

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