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- W3202593989 abstract "A differential emission measure (DEM) method is used to evaluate the relationship of the electron density and temperature before and after a coronal rain event during an active sun over the period from 20:10 UT on October 6 to 02:10 on October 7, 2011. Observational data were obtained from SDO/AIA for six different extreme ultraviolet (EUV) spectral lines. 240 different coronal loops were analyzed during this time interval, and the average electron density and temperature were obtained using 171 Å Fe IX) and 193 Å (Fe XII) filters. The relationship between the density and temperature made it possible to estimate the polytropic index in the solar corona before and after the coronal rain. The polytropic index after termination of the coronal rain was estimated to be γ = 1.3±0.06, Which shows usual thermodynamic properties of study-state coronal plasma. The polytropic index at the time of onset of the coronal rain was, however, estimated to be γ = 2.1±0.11, which indicates an unstable thermodynamic process, i.e., a thermal instability. It is suggested that the coronal rain is the result of an unstable process, and the coronal plasma returns its stable state after the rain." @default.
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- W3202593989 date "2019-02-28" @default.
- W3202593989 modified "2023-09-27" @default.
- W3202593989 title "Measurement of the Polytropic Index During Solar Coronal Rain Using a Diagram of the Electron Density Distribution as a Function of Electron Temperature" @default.
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- W3202593989 doi "https://doi.org/10.1007/s10511-019-09565-8" @default.
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