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- W2078206574 abstract "We present data analysis and interpretation of an M1.4 class flare observed with the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) on 2002 April 30. This event, with its footpoints occulted by the solar limb, exhibits a rarely observed, but theoretically expected, double-source structure in the corona. The two coronal sources, observed over the 6-30 keV range, appear at different altitudes and show energy-dependent structures with the higher energy emission being closer together. Spectral analysis implies that the emission at higher energies in the inner region between the two sources is mainly nonthermal, while the emission at lower energies in the outer region is primarily thermal. The two sources are both visible for about 12 minutes and have similar light curves and power-law spectra above about 20 keV. These observations suggest that the magnetic reconnection site lies between the two sources. Bidirectional outflows of the released energy in the form of turbulence and/or particles from the reconnection site could be the source of the observed radiation. The spatially resolved thermal emission below about 15 keV, on the other hand, indicates that the lower source has a larger emission measure but a lower temperature than the upper source. This is likely the result of the differences in the magnetic field and plasma density of the two sources." @default.
- W2078206574 created "2016-06-24" @default.
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- W2078206574 date "2008-03-20" @default.
- W2078206574 modified "2023-09-27" @default.
- W2078206574 title "Double Coronal Hard and Soft X‐Ray Source Observed by<i>RHESSI</i>: Evidence for Magnetic Reconnection and Particle Acceleration in Solar Flares" @default.
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- W2078206574 doi "https://doi.org/10.1086/527538" @default.
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