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Coordinated observations obtained at Meudon (MSDP) and at Ondejov provide surge spectra in optical range (H, H, H, Hµ, Ca H and K lines) and in radio range. The MSDP data allowed us to follow the time evolution of the surge. The spectra of Balmer lines were used to derive the electron density of the expelled cool material. The radio bursts indicate that the acceleration of electrons took place in the low and dense atmosphere, giving a good argument for a reconnection near the transition region. 相似文献
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