A Comparison of Flares and Prominences in D3 and H(alpha).
Abstract
During 1973, flares were photographed using a 0.4A filter on the D3 line of HeI and, in 1974, with an additional passband at 0.8A into the red wing. During most of this period, time-lapse photographs also were taken on either or both the H(alpha) multi-slit spectrograph and the H(alpha) Doppler filter. On a separate telescope, limb events were photographed in D3 and H(alpha) through similar 8A filters. Very few flares displayed D3 in emission in part of the flare. For large flares, some absorption parts of the D3 flare correspond closely to the H(alpha) flare both spatially and temporally. However, the D3 flare boundaries are more sharply defined. It seemed D3 absorption events were correlated more frequently with surges and active filaments than with flare elements. The relative brightness of D3 and H(alpha) were examined for a number of solar phenomena observed at the limb. High velocity portions of surges, erupting filaments and loops brightened more in H(alpha) were examined for a number of solar phenomena observed at the limb. High velocity portions of surges, erupting filaments and loops brightened more in H(alpha) than in D3. In limb flares, D3 brightened more than H(alpha).
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 1975
- Accession Number
- ADA016758
Entities
People
- Harry E. Ramsey
- Karen L. Harvey
- Sara F. Martin
Organizations
- Lockheed Martin Missiles and Space