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eJAAVSO

HELIOGRAPHIC DISTRIBUTION OF SUNSPOTS, 1988-1999

 

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Raymond R. Thompson

Maple Observatory

7 Welton Street

Maple, Ontario L6A 1R8

Canada

 

Presented at the 88th Annual Meeting of the AAVSO, October 30, 1999; revised October 2000

 

Abstract

 

The heliographic latitude and longitude of 1338 penumbral sunspots observed by the author during cycle 22 were plotted on a Mercator-style map of the solar surface in order to study their distribution. Scarcity of spots along the equator and in high latitudes was evident, as were dense clumps and spot-free areas elsewhere. Analysis suggests that the sunspot distribution may not be completely random, but may be somewhat related to photosphere dynamics and interior convective processes.

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