The post-eruptive arcade formation in the limb event on July 31, 2004 from microwave solar observations with the RATAN-600 radio telescope

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A CME/flare event occurred at the western limb on 31 July 2004. Five successive multi-wavelength scans in centimeter range were obtained with the RATAN-600 radio telescope starting at the early stage of post-eruptive arcade formation (24 min after a C8.3 flare peak) and lasting for 4 hours. Microwave radio emission of the arcade was rather intense at initial stage indicating a predominant contribution of thermal emission and then considerably decreased during the decay phase. Its maximum was co-spatial with the 195 Å Fe XII loop tops. At the end of microwave observations the contribution of the emission from accelerated particles became significant. The similarity of microwave characteristics of two eruptive events (on 31 July 2004 at the western limb and on 25 January 2007 at the eastern limb) is shown.

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