Pc 1 micropulsations at a high-latitude station - A study over nearly four solar cycles

Details Pc 1 micropulsations at a high-latitude station - A study over nearly four solar cycles Pc 1 micropulsations at a high-latitude station - A study over nearly four solar cycles

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9617651m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Oct. 1, 1991, p. 17,651-17,661. Research supported by Academy of Finl

Physics

10

Geomagnetic Micropulsations, Polar Regions, Solar Cycles, Magnetometers, Solar Terrestrial Interactions, Sunspots

Scientific paper

Results are presented of a long-term analysis of Pc 1 type micropulsations observed at the Sodankyla Geophyiscal Observatory (Finland), covering the 17th, 19th, and 20th complete 11-year solar cycles and most of cycle 21. A very strong negative correlation was found between the annual Pc 1 activity and the annual sunspot number. As a result, some of the differences between the various solar cycles can be seen in the corresponding cycles of annual Pc 1 activity. Results also revealed some new features common to the long-term variations of Pc 1 activity at high-latitude and midlatitude stations.

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