Cosmic ray decreases and geomagnetic activity: list of events 1982-2002

Details Cosmic ray decreases and geomagnetic activity: list of events 1982-2002 Cosmic ray decreases and geomagnetic activity: list of events 1982-2002

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jastp..66.1121k&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 66, Issue 13-14, p. 1121-1126.

Physics

13

Cosmic Rays, Geomagnetic Activity

Scientific paper

Decreases in cosmic ray (CR) intensity provided by neutron monitors, for the time period 1982-2002, are summarized and compared with simultaneous changes in Dst index. Data from four neutron monitors with different vertical cutoff rigidities are used, namely Oulu (~0.8GV), Lomnický Štít (~4GV) and Haleakala/Huancayo (~13GV). The Dst behaviour during different periods of CR decreases is rather complex. Along with the events when CR decreases are accompanied by corresponding Dst depressions, there are several effects when geomagnetic activity (measured by Dst) is not changing significantly. In some cases large Dst depression is not marked by CR decreases. This work presents 2 tables of CR events as a function of geomagnetic activity. The tables, indicating 19% of CR decreases without Dst variability and 28% of Dst variabilities without clear CR decreases, may be useful for investigating the relation between CR flux values and atmospheric effects and for eventual discrimination between CR flux and geomagnetic activity level influence on the atmospheric processes.

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