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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

    Article

    Meridional-Flow Measurements from Global Oscillation Network Group Data

    We present measurements of the solar meridional flow using time-distance analysis based on Global Oscillation Network Group (GONG) data. In an attempt to detect the deep equatorward flow, which is believed to be ...

    S. Kholikov, F. Hill in Solar Physics (2014)

  3. No Access

    Chapter

    A Search for Helioseismic Signature of Emerging Active Regions

    Using SOHO/MDI and GONG observations we present time–distance deep-focusing measurements to examine the deeper layers of the solar convective zone. The constructed travel-time maps show 10 – 15 second perturba...

    S. Kholikov in Solar Dynamics and Magnetism from the Interior to the Atmosphere (2014)

  4. No Access

    Article

    A Search for Helioseismic Signature of Emerging Active Regions

    Using SOHO/MDI and GONG observations we present time–distance deep-focusing measurements to examine the deeper layers of the solar convective zone. The constructed travel-time maps show 10 – 15 second perturba...

    S. Kholikov in Solar Physics (2013)

  5. No Access

    Article

    Lifetimes of High-Degree p Modes in the Quiet and Active Sun

    We study variations of the lifetimes of high-ℓ solar p modes in the quiet and active Sun with the solar activity cycle. The lifetimes in the degree range ℓ=300 – 600 and ν=2.5 – 4.5 mHz were computed from SOHO/MD...

    O. Burtseva, F. Hill, S. Kholikov, D.-Y. Chou in Solar Physics (2009)

  6. No Access

    Article

    Subsurface Meridional Circulation in the Active Belts

    Temporal variations of the subsurface meridional flow with the solar cycle have been reported by several authors. The measurements are typically averaged over periods of time during which surface magnetic acti...

    I. González Hernández, S. Kholikov, F. Hill, R. Howe, R. Komm in Solar Physics (2008)

  7. No Access

    Article

    Acoustic Radius Measurements from MDI and GONG

    We study the temporal autocorrelation function (ACF) of global solar oscillations. It is well known that the “large frequency separation” is proportional to the solar acoustic radius. We analyze the ACF of MDI...

    S. Kholikov, F. Hill in Solar Physics (2008)

  8. No Access

    Chapter

    Acoustic Radius Measurements from MDI and GONG

    We study the temporal autocorrelation function (ACF) of global solar oscillations. It is well known that the “large frequency separation” is proportional to the solar acoustic radius. We analyze the ACF of MDI...

    S. Kholikov, F. Hill in Helioseismology, Asteroseismology, and MHD Connections (2008)

  9. No Access

    Article

    Effects of Dispersion of Wave Packets in the Determination of Lifetimes of High-Degree Solar p Modes from Time – Distance Analysis: TON Data

    We use the method of time – distance analysis to measure lifetimes of solar p modes in the range ℓ=100 − 600 and ν=3.0 − 4.5 mHz with data taken with the Taiwan Oscillation Network (TON). The lifetimes of p mode...

    O. Burtseva, S. Kholikov, A. Serebryanskiy, D.-Y. Chou in Solar Physics (2007)