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- W2022081760 abstract "The limb flare of 1980 November 18 at 14:51 UT is studied with the X-ray instruments on board the Solar Maximum Mission (SMM). Evidence is found for release of a significant fraction, 10 percent or more, of the flare energy before the impulsive hard X-ray burst. In the impulsive phase the hard X-rays emitted during the rapidly varying part of the burst are observed on the limb, at a level consistent with the chromosphere. During the final stages of the hard X-ray burst, when the fast time structure has disappeared, the hard X-rays clearly come from the corona, at which time the spectrum is softer. Throughout the decay phase of the flare the X-rays also originate in the corona. It is concluded that initially the flare energy is deposited below the transition zone, from which point the chromospheric plasma is ablated. When this plasma has expanded into the corona to the energy release site, particle acceleration associated with such energy release is quenched. The altitude of this site is estimated at 6000 + or - 1500 km above the photosphere. The sequence of observations is consistent with the bulk of the energy being contained in suprathermal protons, in the energy region 100-1000 keV, during the impulsive phase." @default.
- W2022081760 created "2016-06-24" @default.
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- W2022081760 date "1984-09-01" @default.
- W2022081760 modified "2023-10-16" @default.
- W2022081760 title "The impulsive phase of a solar limb flare" @default.
- W2022081760 doi "https://doi.org/10.1086/162467" @default.
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