Ephemeral active regions in 1970 and 1973

Details Ephemeral active regions in 1970 and 1973 Ephemeral active regions in 1970 and 1973

Jan 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...40...87h&link_type=abstract

Solar Physics, vol. 40, Jan. 1975, p. 87-102.

Physics

70

Life (Durability), Solar Activity, Solar Cycles, Spatial Distribution, Sunspots, Solar Magnetic Field, Spectroheliographs, Statistical Correlation, Statistical Distributions, Time Dependence

Scientific paper

A statistical study of ephemeral active regions (ER) in 1970 and 1973 was carried out, yielding data on the spatial distribution of ER, lifetime, solar cycle variation, and their association with major active centers. The data were taken from daily, good quality full-disk magnetograms. On the average, hundreds of ER were present on the sun in 1970 and 1973. The number seems to closely follow the sunspot cycle. About as much magnetic flux appears in the form of ER as appears in large active regions. The surface distribution of ER is nearly random with a tendency to maximize in active sunspot zone latitudes. On the basis of a comparison of the properties of ER and regular active regions, it is concluded that ER represent the small-scale end of a broad spectrum of active region sizes.

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