Extreme ultraviolet spectrum of the solar flare of 2114 UT March 27, 1967

✍ Scribed by R. F. Donnelly; L. A. Hall

• Publisher: Springer
• Year: 1973
• Tongue: English
• Weight: 879 KB
• Volume: 31
• Category: Article
• ISSN: 0038-0938
• DOI: 10.1007/bf00152817

✦ Synopsis

Scanning spectrometer measurements in the range 1310-270/~, observed from the satellite OSO 3, are reported for the solar flare of 2114 UT March 27, 1967. This flare was a long lasting sequence of bursts with EUV spectra consisting of enhanced lines and recombination continua normally emitted from the chromosphere and chromosphere-corona transition region, with tmusually small increases in lines normally emited from the corona. An EUV flare spectrum is presented and suggested as one example for interpreting broadband observations of EUV bursts. Any broadband continuum other than known recombination continua contributed less than 6 ,% of the measured line and hydrogen recombination continua in the range 270-1310 /~. The ratio of photon flux of Cn~ 1176 ~ to that of Cm 977 ,& was 0.86, which suggests an ambient density in the region of emission greater than 101~ cm -3 at temperatures near 60000 K.