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Oscillations accompanying a He I 10830 Å negative flare in a solar facula View all abstracts by submitter

Andrei Chelpanov   Submitted: 2018-11-07 20:07

On 21 September 21 2012, we carried out spectral observations of a solar facula in the Si I 10827 Å , He I 10830 Å, and Hα spectral lines. Later, in the process of analyzing the data, we found a small-scale flare in the middle of the time series. Due to an anomalous increase in the absorption of the He I 10830 Å line, we identified this flare as a negative flare. The aim of this article is to study the influence of the negative flare on the oscillation characteristics in the facular photosphere and chromosphere. We measured line-of-sight (LOS) velocity and intensity of all the three lines as well as the half width of the chromospheric lines. We also used Helioseismic and Magnetic Imager (HMI) magnetic field data. The flare caused a modulation of all the studied parameters. In the location of the negative flare, the amplitude of the oscillations increased four times on average. In the adjacent magnetic field local maxima, the chromospheric LOS velocity oscillations appreciably decreased during the flare. The facular region oscillated as a whole with a 5-minute period before the flare, and this synchronicity was disrupted after the flare. The flare changed the spectral composition of the LOS magnetic field oscillations, causing an increase in the low-frequency oscillation power.

Authors: Andrei Chelpanov, Nikolai Kobanov
Projects: None

Publication Status: Accepted to Solar Physics
Last Modified: 2018-11-08 11:40
Go to main E-Print page  Three-dimensional Magnetic Reconnection Triggering an X-class Confined Flare in Active Region 12192  The Origin of Major Solar Activity - Collisional Shearing Between Nonconjugated Polarities of Multiple Bipoles Emerging Within Active Regions  Edit Entry  Download Preprint  Delete Entry 

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