230 citations · 1.2k across the 56 of their papers we have counts for
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Variation of Acoustic Power with Magnetic Field as seen in Gong+ Data
P. Venkatakrishnan, Brajesh Kumar, S. C. Tripathy
The acoustic spectra in sunspots are known to be richer in higher frequency power. We have attempted a generalized study of the effect of magnetic fields on the shape of the acoust…
Search for Spatial Variability in the Solar Acoustic Spectrum
P. Venkatakrishnan, Brajesh Kumar, S. C. Tripathy
Motivated by the various examples of spatial variability in the power of the acoustic spectrum, we attempted to look for spatial variability in the peak frequency of the spectrum.…
Analysis of hysteresis effect in p mode frequency shifts and solar activity indices
S. C. Tripathy, Brajesh Kumar, Kiran Jain +1
Using intermediate degree p mode frequency data sets for solar cycle 22, we find that the frequency shifts and magnetic indices show a `hysteresis' phenomenon. It is observed that…
p-modes in and away from a sunspot
Brajesh Kumar, R. Jain, S. C. Tripathy +2
A time series of GONG Dopplergrams for the period 10-14 May 1997 from Udaipur and Big Bear sites has been used to measure the velocity fluctuations in the sunspot (NOAA active regi…
Empirical estimate of p-mode frequency shift for solar cycle 23
Kiran Jain, S. C. Tripathy, A. Bhatnagar +1
We have obtained empirical relations between the p-mode frequency shift and the change in solar activity indices. The empirical relations are determined on the basis of frequencies…