Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981soph...69..185f&link_type=abstract
Solar Physics, vol. 69, Jan. 1981, p. 185-209.
Astronomy and Astrophysics
Astronomy
3
Coronal Holes, Radio Astronomy, Solar Corona, Solar Radiation, Solar Rotation, Astronomical Maps, Extreme Ultraviolet Radiation, Oso-7, Solar Instruments, Solar Radio Emission, Solar X-Rays
Scientific paper
The presence of solar coronal holes can be inferred from one-dimensional east-west scans at 692 and 1415 MHz. The scans indicate that coronal holes are stable structures with low-emissive characteristics and with lifetimes which can span several solar rotations, in agreement with observations using other techniques. This work focuses on the first half of 1973. The 1415 MHz data presented for this period show the radio analogues of two coronal holes, commonly referred to as CH1 CH3. These holes were observed at soft X-ray and XUV wavelengths with the Skylab satellite and at EUV with the OSO-7 satellite. The analysis is then extended to cover the period from 1968 to 1974 with a central meridian passage date and a subjective classification being assigned to each coronal hole observation. This information is tabulated and provides a consistent set of coronal hole observations during the maximum and declining phases of solar cycle 20.
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