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• W3100921397 abstract "In the paper the spectral temporal evolution of a steeply rising submillimeter (THz) burst occurred on 2003 November 2 was investigated in detail for the first time. Observations show that the flux density of the THz spectrum increased steeply with frequency above 200 GHz. Their average rising rates reached a value of 235 sfu/GHz (corresponding spectral index $alpha$ of 4.8) during the burst. The flux densities reached about 4,000 and 70,000 sfu at 212 and 405 GHz at maximum phase, respectively. The emissions at 405 GHz maintained continuous high level that they exceed largely the peak values of the microwave (MW) spectra during the main phase. Our studies suggest that only energetic electrons with a low-energy cutoff of $sim$1 MeV and number density of $sim$$10^{6}$--$10^{8}$ cm$^{-3}$ can produce such strong and steeply rising THz component via gyrosynchrotron (GS) radiation based on numerical simulations of burst spectra in the nonuniform magnetic field case. The electron number density $N$, derived from our numerical fits to the THz temporal evolution spectra, increased substantially from $8times10^{6}$ to $4times10^{8}$ cm$^{-3}$, i.e., $N$ value increased 50 times during the rise phase. During the decay phase it decreased to $7times10^{7}$ cm$^{-3}$, i.e., decreased about five times from the maximum phase. The total electron number decreased an order of magnitude from the maximum phase to the decay phase. Nevertheless the variation amplitude of $N$ is only about one time in the MW emission source during this burst, and the total electron number did not decrease but increased by about 20$%$ during the decay phase. Interestingly, we find that the THz source radius decreased by about 24$%$ while the MW source one, on the contrary, increased by 28$%$ during the decay phase." @default.
• W3100921397 created "2020-11-23" @default.
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• W3100921397 date "2016-01-01" @default.
• W3100921397 modified "2023-09-26" @default.
• W3100921397 title "Study of temporal evolution of emission spectrum in a steeply rising submillimeter burst" @default.
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• W3100921397 doi "https://doi.org/10.1088/1674-4527/16/1/008" @default.
• W3100921397 hasPublicationYear "2016" @default.
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