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)

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 0.1-7.0nm (the energy range is 0.18-12.4keV).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.