Longitudinal and temporal variations of sunspot regions and coronal holes during cycle 21

Details Longitudinal and temporal variations of sunspot regions and coronal holes during cycle 21 Longitudinal and temporal variations of sunspot regions and coronal holes during cycle 21

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..125..125s&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 125, Jan. 1990, p. 125-132.

Physics

8

Coronal Holes, Solar Longitude, Sunspot Cycle, Heliometers, Time Dependence

Scientific paper

The relationship between sunspot activity in heliographic longitude and coronal holes is investigated for the period corresponding to Cycle 21. The major results is that, based on He I 10830 A data, a strong inverse association is found between the longitudinal positions of the sunspot groups and the size and number of coronal holes. Frequencies of coincidences in longitude were determined for both types of activity and the evolution of coronal holes over Cycle 21 is depicted in the form of a 'butterfly diagram' displaying their latitudinal and longitudinal extents. A tabular listing identifies average longitude and persistence of sunspot active longitudes.

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