The flare of December 17, 1980 observed with high time resolution by a digital CCD camera

Details The flare of December 17, 1980 observed with high time resolution by a digital CCD camera The flare of December 17, 1980 observed with high time resolution by a digital CCD camera

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982soph...78..215k&link_type=abstract

Solar Physics, vol. 78, June 1982, p. 215-224. Swiss National Science Foundation

Physics

14

Cameras, Charge Coupled Devices, Digital Techniques, High Resolution, Solar Flares, Systems Engineering, Temporal Resolution, Data Processing, H Alpha Line, Image Processing, Light Curve, Magnetic Tapes, Minicomputers, Solar Spectra, Statistical Analysis

Scientific paper

An electro-optical system for the digital registration of H alpha images with high time resolution is described. The sensor is a CCD with 100 x 100 elements, resulting in a resolution of 3 x 4 arcsec on the sun. Data are digitized with a resolution of eight bits and written on magnetic tape by means of a minicomputer. Image analysis on a large computer eliminates instrumental effects, calibrates the data, and reproduces them in graphical form. The analysis of a flare shows that the different flare kernels brighten at different times and pulsate in diamter and intensity. The decay of the flare is slower if fainter regions are included. This supports the idea that an impulsive flare confined in a magnetic loop spreads out over a larger area during the gradual phase. Comparison with microwave observations shows the same risetime for both spectral ranges which indicates that they are excited by the same agent. Furthermore the H alpha flare lags the microwave burst by about eight seconds indicating that the source of primary energy release lies above the H alpha emitting layers.

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