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- W2007290269 abstract "The content of hot material in the corona is not constant. Soft X-ray and high-temperature EUV line observations show that new material, apparently heated and evaporated from the chromosphere, is frequently injected into the corona both in active and quiet regions. Active regions are found to exhibit transient brightenings, termed here microflares, due to such enhancements in emission measure. They appear at a rate of up to 10 per hour in RHESSI observations of 3--15 keV X-rays, occurring even during the periods of lowest solar activity so far in the mission. The RHESSI observations combined with measurements at other wavelengths yield estimates of the energy input into the corona. These observations suggest that the models for coronal heating must be complemented with respect to continuous replenishing the lower corona by chromospheric material heated to coronal temperatures. The observed micro-events are secondary phenomena and do not represent the primary energy release, nor its total amount. Nevertheless, they are an interesting source of information on the heating process(es) of the corona. The micro-events are compared to events in quiet regions, termed here nanoflares, which seem to be a different population, well separated in temperature and emission measure from microflares." @default.
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- W2007290269 date "2003-09-01" @default.
- W2007290269 modified "2023-10-18" @default.
- W2007290269 title "Micro-events in the active and quiet solar corona" @default.
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- W2007290269 doi "https://doi.org/10.1016/s0273-1177(03)00306-5" @default.
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