Using simultaneous high spatial ( 1.3 arc sec ) and temporal ( 5 and 10 s ) resolution H-alpha observations from the 15 cm Solar Tower Telescope at ARIES , we study the oscillations in the relative intensity to explore the possibility of sausage oscillations in the chromospheric cool postflare loop .
We use standard wavelet tool , and find the oscillation period of \approx 587 s near the loop apex , and \approx 349 s near the footpoint .
We suggest that the oscillations represent the fundamental and the first harmonics of fast sausage waves in the cool postflare loop .
Based on the period ratio P _ { 1 } / P _ { 2 } \sim 1.68 , we estimate the density scale height in the loop as \sim 17 Mm .
This value is much higher than the equilibrium scale height corresponding to H-alpha temperature , which probably indicates that the cool postflare loop is not in hydrostatic equilibrium .
Seismologically estimated Alfvén speed outside the loop is \sim 300-330 km/s .
The observation of multiple oscillations may play a crucial role in understanding the dynamics of lower solar atmosphere , complementing such oscillations already reported in the upper solar atmosphere ( e.g. , hot flaring loops ) .