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Simultaneous near-sun observations of a moving type IV radio burst and the associated white-light coronal mass ejection

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dc.contributor.author Hariharan, K
dc.contributor.author Ramesh, R
dc.contributor.author Kathiravan, C
dc.contributor.author Wang, T. J
dc.date.accessioned 2020-11-17T14:33:05Z
dc.date.available 2020-11-17T14:33:05Z
dc.date.issued 2016-05
dc.identifier.citation Solar Physics, Vol. 291, No. 5, pp. 1405-1416 en_US
dc.identifier.issn 1573-093X
dc.identifier.uri http://prints.iiap.res.in/handle/2248/7172
dc.description Restricted Access © Springer The original publication is available at springerlink.com http://dx.doi.org/10.1007/s11207-016-0918-x en_US
dc.description.abstract We present rare contemporaneous low-frequency (< 100 MHz) imaging, spectral, and polarimetric observations of a moving type IV radio burst that had close spatio-temporal association with a white-light coronal mass ejection (CME) near the Sun. We estimate the electron density near the burst region from white-light coronagraph polarized brightness (pB) images of the CME as well as the two-dimensional radio imaging observations of the thermal free-free emission at a typical radio frequency such as 80 MHz. We analyze the burst properties such as the degree of circular polarization, the spectral index, and fine structures using the radio polarimeter and the radio spectral observations. The obtained results suggest that second harmonic plasma emission from the enhanced electron density in the leading edge of the CME is the cause of the radio burst. We determine the strength of the coronal magnetic field (B) for the first time based on this interpretation. The estimated value (B ≈ 1 gauss) in the CME leading edge at a heliocentric distance of ≈ 2.2 R⊙ agrees well with the similar B values reported earlier based on other types of observations. en_US
dc.language.iso en en_US
dc.publisher Springer en_US
dc.subject Coronal magnetic field en_US
dc.subject Coronal mass ejections en_US
dc.subject Sun: radio bursts en_US
dc.title Simultaneous near-sun observations of a moving type IV radio burst and the associated white-light coronal mass ejection en_US
dc.type Article en_US


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