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Oscillations Accompanying a He I 10830 Å Negative Fare in a Solar Facula II. Response of the Transition Region and Corona View all abstracts by submitter

Andrei Chelpanov   Submitted: 2019-04-25 20:47

We studied oscillations related to flare SOL2012-09-21T02:19 in the transition region and chromosphere based on Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) and Solar Dynamics Observatory (SDO) data, as well as data from a ground-based observatory. We found that 2-minute oscillations triggered by the flare first appeared in the RHESSI channels then subsequently showed up in the SDO 171 Å and 304 Å channels and after that in the chromospheric He I 10830 Å line. The delay of the chromospheric signal compared to the RHESSI signal is 7 minutes, which indicates that the wave perturbation propagated from the corona to the chromosphere. We used the sharp increase in 3- and 5-minute oscillations during the flare in the lower atmosphere to trace the propagation of the oscillation trains to the transition region and corona. The results show that the 171 Å channel signals lagged behind the photospheric and chromospheric signals by 200 s on average. We suggest that we observed slow magnetoacoustic waves both in the case of 2-minute oscillations propagating downwards from the corona and in the case of 3- and 5-minute oscillations leaking to the corona from beneath.

Authors: Nikolai Kobanov and Andrei Chelpanov
Projects: None

Publication Status: Accepted to Solar Physics
Last Modified: 2019-05-01 12:05
Go to main E-Print page  E and B polarizations from inhomogeneous and solar surface turbulence  Flare reconnection-driven magnetic field and Lorentz force variations at the Sun's surface  Edit Entry  Download Preprint  Delete Entry 

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