72 citations · 252 across the 13 of their papers we have counts for
13 papers
Temporal variations of solar inertial mode parameters from GONG (2002-2024) and HMI (2010-2024): Rossby modes () and high-latitude mode
B Lekshmi, Zhi-Chao Liang, Laurent Gizon +2
We studied the temporal evolution of solar inertial modes over the solar cycle using observations from GONG and SDO/HMI. We focused on the high-latitude mode with azimuthal wavenum…
Oscillations of the solar photospheric magnetic field caused by the m = 1 high-latitude inertial mode
Stephan G. Heinemann, Zhi-Chao Liang, Laurent Gizon
Periodic oscillations at 338 nHz in the Earth frame are observed at high latitudes in direct Doppler velocity measurements. These oscillations correspond to the high-latitude…
Structure and Dynamics of the Sun's Interior Revealed by Helioseismic and Magnetic Imager
Alexander Kosovichev, Sarbani Basu, Yuto Bekki +43
High-resolution helioseismology observations with the Helioseismic and Magnetic Imager (HMI) onboard Solar Dynamics Observatory (SDO) provide a unique three-dimensional view of the…
Observations of eigenfunctions of solar inertial modes using local correlation tracking of magnetic features
Neelanchal Joshi, Zhi-Chao Liang, Damien Fournier +1
Solar inertial modes are quasi-toroidal modes of the Sun that are of practical interest as they allow probing the deep convection zone. Since 2010, solar images of the photospheric…
Solar Inertial Modes
Laurent Gizon, Yuto Bekki, Aaron C. Birch +5
The Sun's global inertial modes are very sensitive to the solar differential rotation and to properties of the deep solar convection zone which are currently poorly constrained. Th…
Doppler velocity of high-latitude inertial mode over the last five sunspot cycles
Zhi-Chao Liang, Laurent Gizon
Among the identified solar inertial modes, the high-latitude mode with azimuthal order (HL1) has the largest amplitude and plays a role in shaping the Sun's differential rota…
Temporal Variation of Solar Equatorial Rossby Modes with Azimuthal Orders
B. Lekshmi, Laurent Gizon, Kiran Jain +2
We use nearly two decades of helioseismic data obtained from the GONG (2002-2020) and HMI (2010-2020) ring-diagram pipelines to examine the temporal variations of the properties of…
Contribution of flows around active regions to the north-south helioseismic travel-time measurements
Paul-Louis Poulier, Zhi-Chao Liang, Damien Fournier +1
Context. In local helioseismology, the travel times of acoustic waves propagating in opposite directions along the same meridian inform us about horizontal flows in the north-south…
Solar inertial modes: Observations, identification, and diagnostic promise
Laurent Gizon, Robert H. Cameron, Yuto Bekki +10
The oscillations of a slowly rotating star have long been classified into spheroidal and toroidal modes. The spheroidal modes include the well-known 5-min acoustic modes used in he…
Solar Rossby waves observed in GONG++ ring-diagram flow maps
Chris S. Hanson, Laurent Gizon, Zhi-Chao Liang
Context: Solar sectoral Rossby waves have only recently been unambiguously identified in Helioseimsic and Magnetic Imager (HMI) and Michelson Doppler Imager (MDI) maps of flows nea…
Time-distance helioseismology of solar Rossby waves
Zhi-Chao Liang, Laurent Gizon, Aaron C. Birch +1
Context. Solar Rossby waves (r modes) have recently been discovered in the near-surface horizontal flow field using the techniques of granulation-tracking and ring-diagram analysis…
Solar meridional circulation from twenty-one years of SOHO/MDI and SDO/HMI observations: Helioseismic travel times and forward modeling in the ray approximation
Zhi-Chao Liang, Laurent Gizon, Aaron C. Birch +2
The south-north travel-time differences are measured by applying time-distance helioseismology to the MDI and HMI medium-degree Dopplergrams covering May 1996-April 2017. Our data…
Comparison of acoustic travel-time measurement of solar meridional circulation from SDO/HMI and SOHO/MDI
Zhi-Chao Liang, Aaron C. Birch, Thomas L. Duvall +2
Time-distance helioseismology is one of the primary tools for studying the solar meridional circulation. However, travel-time measurements of the subsurface meridional flow suffer…