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Propagating disturbances along a coronal loop from simultaneous EUV imaging and spectroscopic observations

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dc.contributor.author Datta, A
dc.contributor.author Prasad, S. K
dc.contributor.author Banerjee, D
dc.date.accessioned 2020-11-20T13:28:35Z
dc.date.available 2020-11-20T13:28:35Z
dc.date.issued 2015-07
dc.identifier.citation Research in Astronomy and Astrophysics, Vol. 15, No. 7, pp. 1027-1035 en_US
dc.identifier.issn 1674-4527
dc.identifier.uri http://prints.iiap.res.in/handle/2248/7334
dc.description Restricted Access © IOP Publishing http://dx.doi.org/10.1088/1674-4527/15/7/010 en_US
dc.description.abstract Propagating disturbances (PDs) were studied along an active region loop using simultaneous imaging and spectroscopy. An image sequence recorded in the Fe IX/Fe X 171Å channel, from TRACE and spectral data in the Si XII 520.6 Å line obtained from CDS/SOHO, are analyzed. A space-time map constructed from the TRACE image sequence shows the presence of PDs close to the loop foot point propagating with an apparent speed of 39 km s−1. The periodicity was found to be 5.4 min. The corresponding spectroscopic data from CDS, at a location away from the foot point, show oscillations in all three line parameters roughly at the same period. At locations farther from the foot point, the line width oscillation seems to disappear while the Doppler velocity oscillation becomes prominent. We attribute this to the signature of propagating slow waves that get affected by flows/other events close to the foot point. Spectral line profiles do not show much asymmetry, however, it is difficult to infer anything due to the broadened Gaussian shape of the CDS line profiles. en_US
dc.language.iso en en_US
dc.publisher IOP Publishing en_US
dc.subject Sun: corona en_US
dc.subject Oscillations en_US
dc.subject UV radiation en_US
dc.subject Imaging spectroscopy en_US
dc.title Propagating disturbances along a coronal loop from simultaneous EUV imaging and spectroscopic observations en_US
dc.type Article en_US

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