Observation of Intensity Oscillations in Corona during the Total Solar Eclipse of October 24, 1995

Abstract

An experiment to search for short-period oscillations in the solar corona was conducted during the total solar eclipse of 1995 October 24 at Kalpi, India. The intensity in the continuum, centred around 5500 Armsrong and with a passband having a half-width of 240 Armstrong, was recorded at a counting rate of 20Hz using a thermoelctric-liquid cooled photomultiplier. The power spectrum analysis of the data reveals that most of the power is contained in 6 frequencies below 0.2Hz. A least-square analysis gives the periods of the 6 frequency components to be 56.5, 19.6, 13.5, 8.0, 6.1 and 5.3 sec. These oscillations are found to be sinusoidal and their amplitudes are found to lie in the range 0.2 - 1.3% of the coronal brightness.