Computer Science
Scientific paper
Nov 1970
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970natur.228..654g&link_type=abstract
Nature, Volume 228, Issue 5272, pp. 654-655 (1970).
Computer Science
3
Scientific paper
THE satellite OSO-IV, launched on October 18, 1967, carried a group of detectors to observe the soft X-ray emission from the Sun1, Fig. 1 shows sample time profiles of the emission during flares as observed with a detector sensitive in the wavelength band 0.1 to 0.3 nm. In each case the time scale is the same but the intensity scale has been adjusted to show the full range of values during each event. During the visible class 1N flare represented in Fig. 1a, the X-radiation reached two peaks, the maxima being 6 min apart. Further evidence of such a time period is shown in Fig. 1b where the initial activity is considerably smaller than the second peak of the flare. Flares of this type have been noted by Teske2 and by Culhane and Phillips3; the initial event has been called the precursor to the main event. It is suggested here that the precursor is really a part of the main flare activity, but that unlike the increase in Fig 1a the initial development is relatively small compared with the second increase. Indeed, further evidence that this is the case seems to be provided by Fig. 1c. In this case there is a minor increase in X-ray flux about 6 min after the main increase. If the relative intensities of the two increases had been different, the first peak might have been called the precursor.
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