Solar cycle variation of magnetic flux emergence

Details Solar cycle variation of magnetic flux emergence Solar cycle variation of magnetic flux emergence

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...214l.141d&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 214, June 15, 1977, p. L141-L144.

Astronomy and Astrophysics

Astronomy

29

Magnetic Flux, Solar Activity, Solar Cycles, Solar Magnetic Field, Solar X-Rays, Magnetic Variations, Spaceborne Astronomy, Sunspot Cycle

Scientific paper

The number of X-ray bright points (XBP) has been measured from solar X-ray images obtained during two rocket flights in 1976. When compared with the data obtained during the Skylab mission (1973), the number is found to be higher by a factor of 2. As the probability of obtaining the result by chance is less than 1 in 5 million, it is concluded that the number of XBP has increased in the three year interval. As all other indicators of activity have decreased between 1973 and 1976, the cyclical variation of the short-lifetime end of the magnetic-flux-emergence spectrum is out of phase with the solar cycle as defined by active regions or sunspots. Since XBP in 1973 contributed more to the emerging magnetic flux than did active regions, the possibility exists that the total amount of emerging magnetic flux may be maximized at a sunspot minimum.

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