O ct 2 00 2 Microflares and hot component in solar active regions

  title={O ct 2 00 2 Microflares and hot component in solar active regions},
  author={A. O. Benz and Paolo C. Grigis},
Open-shutter RHESSI observations of 3–15 keV X-rays are found to exhibit active region transient brightenings and microflares at a rate of at least 10 per hour occurring even during the periods of lowest solar activity so far in the mission. A thermal component fitted by temperatures of 6–14 MK dominates from 3 keV to about 9 keV, but can be traced up to 14 keV in some cases, and has an average duration of 131(±103) seconds at 7–8 keV. The duration increases with decreasing photon energy. The… CONTINUE READING


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