Study of calcium-K network evolution from Antarctica

Details Study of calcium-K network evolution from Antarctica Study of calcium-K network evolution from Antarctica

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994soph..153..157s&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 153, no. 1-2, p. 157-167

Physics

16

Antarctic Regions, Calcium, Chromosphere, K Lines, Solar Activity, Solar Granulation, Solar Magnetic Field, Cameras, Data Correlation, Filtergrams, Frequency Distribution, H Alpha Line, Heliostats, Telescopes

Scientific paper

To study the evolution of large convective cells known as supergranules, a solar telescope was set up at Maitri, Indian permanent station in Antarctica region, during the local summer months (December 1989 through March 1990). A continuous sequence of calcium K-line filtergrams for 106 hours spaced at intervals of about 10 min was obtained. The analysis of the data indicates that the most probable lifetime of the calcium-K network is about 22 hours. The lifetime depends upon the size of the cell and is larger for bigger cells. The data also show that cells (of a given size) associated with remnant magnetic field regions live longer than those in the field-free region. This may mean that the magnetic field plays an improtant role in the confinement of these structures.

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