Recently , ( 23 ) presented evidence of strong correlation between the energy in the high-frequency part ( 5.3 < \nu < 8.3 mHz ) of the acoustic spectrum of the Sun and the solar X-ray flux .
They have used disk-integrated intensity observations of the Sun obtained from the VIRGO ( Variability of solar IRradiance and Gravity Oscillations ) instrument on board SOHO ( Solar and Heliospheric Observatory ) spacecraft .
Similar signature of flares in velocity observations has not been confirmed till now .
The study of low-degree high-frequency waves in the Sun is important for our understanding of the dynamics of the deeper solar layers .
In this paper , we present the analysis of the velocity observations of the Sun obtained from the MDI ( Michelson and Doppler Imager ) and the GOLF ( Global Oscillations at Low Frequencies ) instruments on board SOHO for some major flare events of the solar cycle 23 .
Application of wavelet techniques to the time series of disk-integrated velocity signals from the solar surface using the full-disk Dopplergrams obtained from the MDI clearly indicates that there is enhancement of high-frequency global waves in the Sun during the flares .
This signature of flares is also visible in the Fourier Power Spectrum of these velocity oscillations .
On the other hand , the analysis of disk-integrated velocity observations obtained from the GOLF shows only marginal evidence of effects of flares on high-frequency oscillations .