Long-term quasi-periodic oscillations of EUV-flux on the sun

Details Long-term quasi-periodic oscillations of EUV-flux on the sun Long-term quasi-periodic oscillations of EUV-flux on the sun

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...89..261i&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 89, Dec. 1983, p. 261-273.

Astronomy and Astrophysics

Astronomy

Extreme Ultraviolet Radiation, Long Term Effects, Solar Oscillations, Ultraviolet Astronomy, Flux Quantization, Line Spectra, Oso-4, Spectroheliographs, Temporal Distribution

Scientific paper

Two sequences of OSO-4 spectroheliograms in Mg X and Si XII obtained during October-November 1967 and covering the intervals of 83 and 22 hr, respectively, have been analyzed to reveal quasi-periodic oscillations of EUV flux from solar sources with a periodicity of 5-14 hr. The oscillation periods of the emission flux from local sources over sunspots and magnetic field enhancements in plages without spots have been investigated in correlation with characteristics of the respective AR and plages. The greatest periods (greater than 8 hr) are shown to be peculiar of small sunspots or sunspot groups at the initial or final stage of their development, whereas the smallest periods (about 5-6 hr) are observed in the case of large, well developed groups at the maximum stage of development. In quiet regions on the sun and plages without spots, the oscillation periods are about 6-8 hr. The surface areas in which the oscillations are synchronous and coincide in phase have typical dimensions of less than about 1 arcsec in quiet and 1 to 5 arcsec active regions. These areas form a spatial structure similar to the chromospheric network and supergranules. The characteristic lifetime of the structure elements is about 1.5-2 days.

Affiliated with

Also associated with

No associations

Rating

Long-term quasi-periodic oscillations of EUV-flux on the sun does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Long-term quasi-periodic oscillations of EUV-flux on the sun, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Long-term quasi-periodic oscillations of EUV-flux on the sun will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1806125