Author ORCID Identifier
James McAteer:
https://orcid.org/0000-0003-1493-101X
Document Type
Journal Article
Journal Article Version
Final Version / Publisher's PDF (peer-reviewed)
Publication Date
11-1-2020
Abstract
Three minute oscillations in the chromosphere are attributed to both slow magnetoacoustic waves propagating from the photosphere and to oscillations generated within the chromosphere itself at its natural frequency as a response to a disturbance. Here we present an investigation of the spatial and temporal behavior of the chromospheric 3 minute oscillations before, during, and after the SOL2011-02-15T01:56 X2.2 flare. Observations in ultraviolet emission centered on 1600 and 1700 angstrom obtained at 24 s cadence from the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory are used to create power maps as functions of both space and time. We observe higher 3 minute power during the flare, spatially concentrated in small areas similar to 10 pixels (similar to 4 `') across. This implies that the chromospheric plasma is not oscillating globally as a single body. The locations of increased 3 minute power are consistent with observations of HXR flare emission from previous studies, suggesting that these small areas are manifestations of the chromosphere responding to injection of energy by nonthermal particles. This supports the theory that the chromosphere oscillates at the acoustic cutoff frequency in response to a disturbance.
Published in
Astrophysical Journal
DOI
10.3847/1538-4357/abb701
Keywords
Solar oscillations, Solar chromosphere
Department / Organizational Unit
Astronomy
Copyright Notice
© 2020 L. Farris & R. McAteer, reuse allowed according to Creative Commons license.
License for Reuse
This work is licensed under a Creative Commons Attribution 4.0 International License.
Recommended Citation
Farris, L., & McAteer, R. T. J. (2020). Spatial and temporal analysis of 3 minute oscillations in the chromosphere associated with the X2.2 solar flare on 2011 February 15. Astrophysical Journal, 903(1). https://doi.org/10.3847/1538-4357/abb701