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Richard Schwartz, also of ST Systems, notes that between March 6 and 19 -- the time required for the active region to cross the sun -- the satellite's Hard X-Ray Burst Spectrometer recorded 447 hard X-ray flares, a rate of about 32 per day. The researchers studied the 152-day periodicity of 442 major flares recorded from February 1980 to December 1983 by the Hard X-Ray Burst Spectrometer, one of several devices on board the Solar Maximum Mission that began studying the sun in 1980 (SN: 9/6/80, p. |
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