Variability of solar five-minute oscillations in the corona as observed by the extreme ultraviolet spectrophotometer(ESP) on the solar dynamics observatory/extreme ultraviolet variability experiment (SDO/EVE)

L. Didkovsky, A. Kosovichev, D. Judge, S. Wieman, T. Woods

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Solar five-minute oscillations have been detected in the power spectra of two six-day time intervals from soft X-ray measurements of the Sun observed as a star using the Extreme Ultraviolet Spectrophotometer (ESP) onboard the Solar Dynamics Observatory (SDO)/Extreme Ultraviolet Variability Experiment (EVE). The frequencies of the largest amplitude peaks were found to match the known low-degree modes of global acoustic oscillations within 3.7 μHz and can be explained by a leakage of the global modes into the corona. Due to the strong variability of the solar atmosphere between the photosphere and the corona, the frequencies and amplitudes of the coronal oscillations are likely to vary with time. We investigated the variations in the power spectra for individual days and their association with changes of solar activity, e.g. with the mean level of the EUV irradiance, and its short-term variations caused by evolving active regions. Our analysis of samples of one-day oscillation power spectra for a 49-day period of low and intermediate solar activity showed little correlation with the mean EUV irradiance and the short-term variability of the irradiance. We suggest that some other changes in the solar atmosphere, e.g., magnetic fields and/or inter-network configuration may affect the mode leakage to the corona.

Original languageEnglish (US)
Title of host publicationSolar Dynamics and Magnetism from the Interior to the Atmosphere
PublisherSpringer New York
Pages171-184
Number of pages14
ISBN (Electronic)9781489980052
ISBN (Print)9781489980045
DOIs
StatePublished - Jan 1 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Keywords

  • Helioseismology
  • Solar extreme ultraviolet irradiance
  • Solar p-modes
  • Spectrophotometer

Fingerprint Dive into the research topics of 'Variability of solar five-minute oscillations in the corona as observed by the extreme ultraviolet spectrophotometer(ESP) on the solar dynamics observatory/extreme ultraviolet variability experiment (SDO/EVE)'. Together they form a unique fingerprint.

Cite this