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The Distribution of Sunspot Decay Rates

Published online by Cambridge University Press:  12 April 2016

V. Martínez Pillet ,
F. Moreno-Insertis  and
M. Vázquez
V. Martínez Pillet
Affiliation:
Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain
F. Moreno-Insertis
Affiliation:
Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain
M. Vázquez
Affiliation:
Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain

Abstract

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The distribution of sunspot decay rates is studied using the Greenwich Photoheliographic Results (GPR). The decay rates are seen to be lognormally distributed. An analysis of the lognormal distributions associated to each sunspot group type and for isolated spots is presented. As a remarkable property of the decay process, we show that it happens at a constant total to umbral area ratio.

Type
Session 1. Structure of Active Regions
Information
International Astronomical Union Colloquium , Volume 141: The Magnetic and Velocity Fields of Solar Active Regions , 1993 , pp. 67 - 70
Copyright
Copyright © Astronomical Society of the Pacific 1993

References

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