Observations of Five-minute Solar Oscillations in the Corona Using the Extreme Ultraviolet Spectrophotometer (ESP) On Board the Solar Dynamics Observatory Extreme Ultraviolet Variability Experiment (SDO/EVE)

Details Observations of Five-minute Solar Oscillations in the Corona Using the Extreme Ultraviolet Spectrophotometer (ESP) On Board the Solar Dynamics Observatory Extreme Ultraviolet Variability Experiment (SDO/EVE) Observations of Five-minute Solar Oscillations in the Corona Using the Extreme Ultraviolet Spectrophotometer (ESP) On Board the Solar Dynamics Observatory Extreme Ultraviolet Variability Experiment (SDO/EVE)

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...738l...7d&link_type=abstract

The Astrophysical Journal Letters, Volume 738, Issue 1, article id. L7 (2011).

Astronomy and Astrophysics

Astronomy

1

Sun: Atmosphere, Sun: Corona, Sun: Helioseismology, Sun: Oscillations, Sun: X-Rays, Gamma Rays

Scientific paper

We report on the detection of oscillations in the corona in the frequency range corresponding to five-minute acoustic modes of the Sun. The oscillations have been observed using soft X-ray measurements from the Extreme Ultraviolet Spectrophotometer (ESP) of the Extreme Ultraviolet Variability Experiment on board the Solar Dynamics Observatory. The ESP zeroth-order channel observes the Sun as a star without spatial resolution in the wavelength range of 0.1-7.0 nm (the energy range is 0.18-12.4 keV). The amplitude spectrum of the oscillations calculated from six-day time series shows a significant increase in the frequency range of 2-4 mHz. We interpret this increase as a response of the corona to solar acoustic (p) modes and attempt to identify p-mode frequencies among the strongest peaks. Due to strong variability of the amplitudes and frequencies of the five-minute oscillations in the corona, we study how the spectrum from two adjacent six-day time series combined together affects the number of peaks associated with the p-mode frequencies and their amplitudes. This study shows that five-minute oscillations of the Sun can be observed in the corona in variations of the soft X-ray emission. Further investigations of these oscillations may improve our understanding of the interaction of the oscillation modes with the solar atmosphere, and the interior-corona coupling, in general.

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