Brightness variations of the white light corona during the years 1964?67

Autor: Charles J. Garcia, Shirley F. Hansen, Harold G. Loomis, R. T. Hansen
Rok vydání: 1969
Předmět:
Zdroj: Solar Physics. 7:417-433
ISSN: 1573-093X
0038-0938
DOI: 10.1007/bf00146145
Popis: Observations of the white light corona were made on over 900 days during the years 1964–67 at heights between 1.125 and 2.0 R⊙ with the K-coronameter at Mount Haleakala and Mauna Loa, Hawaii. The brightness distribution of the minimum corona was elliptical with average equatorial intensities three times the polar. Coronal features of the new cycle at 1.125 R⊙ occurred predominantly in the sunspot zones at 25–30° latitude and in a high latitude zone which migrated toward the North pole before solar maximum. The brightness of the inner corona doubled over this period and a close association is found between the average corona and 10.7-cm solar radio flux. Electron densities in the equatorial regions were nearly twice those of Van de Hulst's model corona, in agreement with the results of recent eclipse observations.
Databáze: OpenAIRE
Externí odkaz: