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Title: A Bayesian Approach to Period Searching in Solar Coronal Loops

Abstract

We have applied a Bayesian generalized Lomb–Scargle period searching algorithm to movies of coronal loop images obtained with the Hinode X-ray Telescope (XRT) to search for evidence of periodicities that would indicate resonant heating of the loops. The algorithm makes as its only assumption that there is a single sinusoidal signal within each light curve of the data. Both the amplitudes and noise are taken as free parameters. It is argued that this procedure should be used alongside Fourier and wavelet analyses to more accurately extract periodic intensity modulations in coronal loops. The data analyzed are from XRT Observation Program 129C: “MHD Wave Heating (Thin Filters),” which occurred during 2006 November 13 and focused on active region 10293, which included coronal loops. The first data set spans approximately 10 min with an average cadence of 2 s, 2″ per pixel resolution, and used the Al-mesh analysis filter. The second data set spans approximately 4 min with a 3 s average cadence, 1″ per pixel resolution, and used the Al-poly analysis filter. The final data set spans approximately 22 min at a 6 s average cadence, and used the Al-poly analysis filter. In total, 55 periods of sinusoidal coronal loop oscillationsmore » between 5.5 and 59.6 s are discussed, supporting proposals in the literature that resonant absorption of magnetic waves is a viable mechanism for depositing energy in the corona.« less

Authors:
;  [1]
  1. Montana State University, P.O. Box 173840 Bozeman, MT 59717-3840 (United States)
Publication Date:
OSTI Identifier:
22661333
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 837; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; ALGORITHMS; AMPLITUDES; APPROXIMATIONS; DATA ANALYSIS; GAMMA RADIATION; MAGNETOHYDRODYNAMICS; MODULATION; OSCILLATIONS; PERIODICITY; RESOLUTION; SUN; TELESCOPES; VISIBLE RADIATION; X RADIATION

Citation Formats

Scherrer, Bryan, and McKenzie, David. A Bayesian Approach to Period Searching in Solar Coronal Loops. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA5D59.
Scherrer, Bryan, & McKenzie, David. A Bayesian Approach to Period Searching in Solar Coronal Loops. United States. doi:10.3847/1538-4357/AA5D59.
Scherrer, Bryan, and McKenzie, David. Wed . "A Bayesian Approach to Period Searching in Solar Coronal Loops". United States. doi:10.3847/1538-4357/AA5D59.
@article{osti_22661333,
title = {A Bayesian Approach to Period Searching in Solar Coronal Loops},
author = {Scherrer, Bryan and McKenzie, David},
abstractNote = {We have applied a Bayesian generalized Lomb–Scargle period searching algorithm to movies of coronal loop images obtained with the Hinode X-ray Telescope (XRT) to search for evidence of periodicities that would indicate resonant heating of the loops. The algorithm makes as its only assumption that there is a single sinusoidal signal within each light curve of the data. Both the amplitudes and noise are taken as free parameters. It is argued that this procedure should be used alongside Fourier and wavelet analyses to more accurately extract periodic intensity modulations in coronal loops. The data analyzed are from XRT Observation Program 129C: “MHD Wave Heating (Thin Filters),” which occurred during 2006 November 13 and focused on active region 10293, which included coronal loops. The first data set spans approximately 10 min with an average cadence of 2 s, 2″ per pixel resolution, and used the Al-mesh analysis filter. The second data set spans approximately 4 min with a 3 s average cadence, 1″ per pixel resolution, and used the Al-poly analysis filter. The final data set spans approximately 22 min at a 6 s average cadence, and used the Al-poly analysis filter. In total, 55 periods of sinusoidal coronal loop oscillations between 5.5 and 59.6 s are discussed, supporting proposals in the literature that resonant absorption of magnetic waves is a viable mechanism for depositing energy in the corona.},
doi = {10.3847/1538-4357/AA5D59},
journal = {Astrophysical Journal},
number = 1,
volume = 837,
place = {United States},
year = {Wed Mar 01 00:00:00 EST 2017},
month = {Wed Mar 01 00:00:00 EST 2017}
}