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|Title:||Lifetimes and sizes of supergranular cells|
|Authors:||Raju, K. P|
|Publisher:||Astronomical Society of India|
|Citation:||BASI, Vol. 27, No. 1, pp. 65 - 68|
|Abstract:||Supergranulation is the surface manifestation of large scale solar convection. Since there is a strong correspondence between supergranulation pattern and Ca K chromospheric network, lifetimes and sizes may be obtained from the temporal and spatial autocorrelation functions (ACF), calculated from Ca K filtergrams of the Sun. We have developed a program to study the lifetimes and spatial scales of supergranulation through an extenasive digital analysis. The temporal ACF was calculataed from a 106 hour time-sequence of the data obtained from Antarctica. The lifetimes of quiet cells were found to be about 24-34 hours while that of active cells were about 58-61 hours. The temporal autocorrelation function sometimes showed an oscillataory pattern which may be due to long-term intensity variations or length scale changes associataed with the network. The cell sizes were obtained from Ca K spectroheliograms belonging to the solar minimum phases of 1913-1974 from Kodaikanal Solar Observatory. The average cell size was found to show a curious dependence on solar latitude.|
|Appears in Collections:||BASI Publications|
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