Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1298k&link_type=abstract
Journal of Geophysical Research (Space Physics), Volume 107, Issue A10, pp. SIA 12-1, CiteID 1298, DOI 10.1029/2001JA000290
Astronomy and Astrophysics
Astrophysics
1
Interplanetary Physics: Solar Cycle Variations (7536), Solar Physics, Astrophysics, And Astronomy: Solar Activity Cycle (2162), And Astronomy: Solar And Stellar Variability
Scientific paper
The short-term (27-day sequences) and long-term variabilities of solar line emissions (120-280 nm) and radio emissions (245-2800 MHz) were studied during 1991-2000. The amplitudes of the 27-day oscillations were obtained by Maximum Entropy Method (MEM) and Multiple Regression Analysis (MRA). The amplitudes were small (1-2%) near the solar surface and in the lower chromosphere, increased to ~10% in the upper chromosphere and lower transition region, decreased in the upper transition region, increased to ~12% in the lower corona, and decreased thereafter in the middle and upper corona. The long-term variability also showed qualitatively a similar pattern. The pattern is similar to the dip around 100,000 K observed in the emission measure distribution in the solar atmosphere.
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