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6 Result(s)

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  1. No Access

    Chapter and Conference Paper

    Study of Acoustic Halos in NOAA Active Region 12683

    We characterize the spatio-temporal power distribution around the active region 12683 as a function of height in the solar atmosphere, wave frequencies, magnetic field strength and inclination of the magnetic ...

    S. C. Tripathy, K. Jain, S. Kholikov, F. Hill, P. Cally in Dynamics of the Sun and Stars (2020)

  2. No Access

    Chapter and Conference Paper

    A Comparison of Global Helioseismic-Instrument Performances: Solar-SONG, GOLF and VIRGO

    The SONG spectrograph has recently demonstrated its ability to perform solar radial velocity measurement during the first test run of the Solar-SONG initiative. A preliminary assessment of its performance is c...

    S. N. Breton, R. A. García, P. L. Pallé, S. Mathur… in Dynamics of the Sun and Stars (2020)

  3. No Access

    Article

    Helioseismic ring analysis of CME source regions

    We apply the ring diagram technique to source regions of halo coronal mass ejections (CMEs) to study changes in acoustic mode parameters before, during, and after the onset of CMEs. We find that CME regions as...

    S. C. Tripathy, S. de Wet, K. Jain, R. Clark… in Journal of Astrophysics and Astronomy (2008)

  4. No Access

    Article

    Acoustic power map** for active regions from MDI, HLH, and TON data

    Based on the HLH and TON ground-based helioseismological projects and the SOHO/MDI spaceborne project, we obtained acoustic power maps of active regions averaged over 1 mHz intervals. These maps allowed the sp...

    O. V. Ladenkov, F. Hill, Sh. A. Egamberdiev, D. Y. Chou in Astronomy Letters (2002)

  5. No Access

    Chapter

    Variations in Solar Sub-Surface Rotation From Gong Data 1995–1998

    We have completed an analysis of the first 35 GONG Months (1 GM = 36 days) covering the last solar minimum and the rising phase of cycle 23. The mode parameters have been estimated from 33 time series, each of...

    R. Howe, R. Komm, F. Hill in Helioseismic Diagnostics of Solar Convection and Activity (2001)

  6. No Access

    Chapter

    Solar Shear Flows Deduced From Helioseismic Dense-Pack Samplings of Ring Diagrams

    We report on large-scale horizontal flows in the solar convection zone and their variability in time and space using a local-helioseismology technique known as ring-diagram analysis. By performing this analysi...

    D. A. Haber, B. W. Hindman, J. Toomre… in Helioseismic Diagnostics of Solar Convecti… (2001)