Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...229..375p&link_type=abstract
Astrophysical Journal, Part 1, vol. 229, Apr. 1, 1979, p. 375-386. Research supported by the Consiglio Nazionale delle Ricerche
Astronomy and Astrophysics
Astronomy
46
Radio Astronomy, Solar Corona, Solar X-Rays, X Ray Astronomy, Astronomical Catalogs, Brightness Temperature, Centimeter Waves, Cyclotron Radiation, High Resolution, Sunspots
Scientific paper
High spatial resolution observations of solar active regions in soft X-rays and centimetric wavelengths are compared using X-ray and radio data obtained during the 1973 Skylab mission. An overall correspondence in position and size between regions of enhanced X-ray emission and regions of enhanced microwave emission was noticed. However, a closer analysis of the findings suggested that substantial differences exist between the emission properties of the atmosphere over sunspots and that over plages, with the difference probably related to the average intensity of the magnetic field, which was found to be higher over sunspot umbrae than over plage areas.
Felli Marcello
Pallavicini Roberto
Tofani Gianni
Vaiana Giuseppe S.
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