n MNASSA : Monthly Notes of the Astronomical Society of South Africa - Solar report
|Article Title||Solar report|
|© Publisher:||Astronomical Society of Southern Africa (ASSA)|
|Journal||MNASSA : Monthly Notes of the Astronomical Society of South Africa|
|Author||Jacques Van Delft|
|Publication Date||Apr 2005|
Extracted from text ... 77 april 2005 observer's page: solar report With the ASSA currently emphasising observations, the Solar Section wants to develop a professional platform where you, the observer, can participate in national and international solar observations. Regular reports will be published in MNASSA. Sunspot counts The relative sunspot number, R, is given by R = 10?g + f, were g is the number of groups and f is the total number of individual spots. It is a useful measure of daily solar activity. However, for investigating activity over longer periods of time, for example over the 11-year solar cycle, the monthly mean ..
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