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Browsing by Author "Jain, K"

Browsing by Author "Jain, K"

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  • On the p-mode Asymmetry between Velocity and Intensity from the GONG+ Data 
    Tripathy, S. C; Jain, K; Hill, F; Toner, C. G (Astronomical Society of India, 2003)
    We have analyzed the local acoustic spectra of small regions over the solar surface at different locations from disk center to limb via the technique of ring diagrams. The analysis suggest that the frequency shifts between ...
  • Reconstruction of the past total solar irradiance on short timescales 
    Jain, K; Hasan, S. S (American Geophysical Union, 2004)
    The aim of this investigation is to present a new analysis of short-term variations in total solar irradiance by developing regression models and to extend these to epochs when irradiance measurements were not available. ...
  • Reconstruction of Total Solar Irradiance on Multiple Time Scales 
    Jain, K; Hasan, S. S (Astronomical Society of India, 2003)
    We have developed regression models of total solar irradiance on different time scales by parameterizing the combined influence of sunspots and faculae. These models are useful in identifying the key parameters responsible ...
  • A relation between frequency shift and the changes in activity indices 
    Jain, K; Tripathy, S. C; Kumar, B; Bhatnagar, A (Astronomical Society of India, 2000)
    We present a linear relation between the shift in p-mode frequencies and variation in two solar activity indices, namely the sunspot number and 10.7 cm radio flux. From this relation, an empirical model is constructed to ...
  • Solar rotation rate from minimum to maximum of activity cycle 
    Jain, K; Tripathy, S. C; Bhatnagar, A; Kumar, B (Astronomical Society of India, 2001)
    Using helioseismic data from SOI/MDI and GONG for the current solar cycle 23, from solar minimum to near maximum phase, we report here on the temporal variation of the rotation rate.
  • A study of acoustic halos in active region NOAA 11330 using multi-height SDO observations 
    Tripathy, S. C; Jain, K; Kholikov, S; Hill, F; Rajaguru, S. P; Cally, P. S (Elsevier B.V, 2018-01)
    We analyze data from the Helioseismic Magnetic Imager (HMI) and the Atmospheric Imaging Assembly (AIA) instruments on board the Solar Dynamics Observatory (SDO) to characterize the spatio-temporal acoustic power distribution ...
  • Temporal variations of solar p-mode frequencies on time scales of 27 days 
    Tripathy, S. C; Jain, K; Bhatnagar, A (Astronomical Society of India, 2002-09)
    We have studied variations in the frequencies of intermediate degree solar oscillation modes on a time cadence of 18 and 27 days. We report that the p-modes adjust to changes in the activity measures on time scales as ...
  • Variations in Oscillation Frequencies From Minimum to Maximum of Solar Activity 
    Jain, K; Bhatnagar, A (Springer, 2003-04)
    The temporal variation in intermediate-degree-mode frequencies is analysed using helioseismic data which cover the minimum to the maximum phase of the current solar cycle. To study the variation in detail, the measured ...

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