Some Observations of Dark Filaments in Prominences.

Abstract

view Abstract Citations (4) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Some Observations of Dark Filaments in Prominences. Öhman, Yngve Abstract During a year's stay at the High Altitude Observatory in Boulder, Colorado, the writer had the opportunity to study a number of spectrum plates of the corona obtained with a wide slit. A great number of photographs of prominences have also been examined. Indications have been found of the presence in many prominences of apparently dark filaments, when observations are made in the Ha line. Though it is generally difficult to distingnish between "dark" filaments and rifts, some rather convincing cases suggesting the presence of faintly luminous lanes of absorbing matter have been detected. The observations have been confirmed by spectroheliographic material kindly put at my disposal by the Mount Wilson and the McMath-Hulbert Observatories. Photographs of prominences selected in 1948 and 1949 at the Stockholm Observatory and examined after my return to Sweden have also given evidence in favor of the opinion that a "dark" structure is often associated with prominences. Publication: The Astrophysical Journal Pub Date: September 1951 DOI: 10.1086/145474 Bibcode: 1951ApJ...114..367O full text sources ADS |