Sunspot prominences and the yellow coronal line. | Zendy

Walter Orr Roberts | Zendy

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Sunspot prominences and the yellow coronal line.

Author(s) -

Walter Orr Roberts

Publication year - 1951

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/106597

Subject(s) - solar prominence , physics , sunspot , coronal plane , astronomy , line (geometry) , astrophysics , solar physics , geodesy , geometry , geography , magnetic field , medicine , anatomy , mathematics , quantum mechanics

A study of twenty-five cases of bright emission of the yellow coronal line X 5694, from 1946 through 1951 revealed close association between this emission and fast-moving prominences of the “sunspot” type. It also showed that unusually sharp discontinuities and intensifications of the red coronal line X 6374 occurred at the regions where the yellow coronal line was seen. In a few cases small Doppler effects in X 6374 also appeared at the solar-limb position of the X 5694 emission. The observations lead to the preliminary speculation that the source of the emission corona lies in a few, relatively small, active regions scattered over the solar disk.

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