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Solar Physics

, 294:11 | Cite as

A Global Survey of EUV Coronal Power Spectra

  • Karl BattamsEmail author
  • Brendan M. Gallagher
  • Robert S. Weigel
Article

Abstract

We present results of an investigation of single-pixel intensity power spectra from a 12-hour time period on 26 June 2013 in a \(1600 \times 1600\)-pixel region from four wavelength channels of NASA’s Solar Dynamics Observatory/Atmospheric Imaging Assembly. We extract single-pixel time series from derotated image sequences, fit two models as a function of frequency \([\nu]\) to their computed power spectra, and study the spatial dependence of the model parameters: i) a three-parameter power law + tail, \(A\nu^{-n}+C\), and ii) a power law + tail + three-parameter localized Lorentzian, \(A\nu^{-n} + C + \alpha/ (1 + (\ln\nu-\beta)^{2} /\delta^{2} )\), the latter to model periodicity. Spectra are well described by at least one of these models for all pixel locations, with the spatial distribution of best-fit model parameters shown to provide new and unique insights into turbulent, quiescent, and periodic features in the EUV corona and upper photosphere. Findings include the following: individual model parameters correspond clearly and directly to visible solar features; detection of numerous quasi-periodic three- and five-minute oscillations; observational identification of concentrated magnetic flux as regions of largest power-law indices \([n]\); identification of sporadically located five-minute oscillations throughout the corona; detection of the known global \({\approx}\,\mbox{four}\)-minute chromospheric oscillation; 2D spatial mapping of “coronal bullseyes” appearing as radially decaying periodicities over sunspots and sporadic foot-point regions, and of “penumbral periodic voids” appearing as broad rings around sunspots in 1600 and 1700 Å in which spectra contain no statistically significant periodic component.

Keywords

Oscillations, solar Turbulence Sunspots, penumbra, umbra 

Notes

Acknowledgments

K. Battams was supported by the NRL Edison Memorial Program and the Office of Naval Research. The authors wish to thank Jack Ireland for his many inputs during discussion and assistance with model-fitting validation. We are also grateful for the insights of our anonymous reviewers, whose comments have led to significant improvements in this study.

Disclosure of Potential Conflicts of Interest

The authors declare that they have no conflicts of interest.

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Copyright information

© This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply 2019

Authors and Affiliations

  1. 1.US Naval Research LaboratoryWashington, DCUSA
  2. 2.George Mason UniversityFairfaxUSA

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