75 citations · 138 across the 13 of their papers we have counts for
14 papers
Characterizing the Observational Properties of the Sun's High-latitude m=1 Inertial Mode
Boyang Ding, Junwei Zhao, Ruizhu Chen +3
Low-m inertial modes have been recently discovered in the Sun's high-latitude regions. In this study, we characterize the observational properties of the m = 1 mode by analyzing ti…
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…
Ensemble Kalman Filter Data Assimilation Into Surface Flux Transport Model To Infer Surface Flows: An Observing System Simulation Experiment
Soumyaranjan Dash, Marc L. DeRosa, Mausumi Dikpati +4
Knowledge of the global magnetic field distribution and its evolution on the Sun's surface is crucial for modeling the coronal magnetic field, understanding solar wind dynamics, co…
Impact of Anomalous Active Regions on the Large-scale Magnetic Field of the Sun
Shaonwita Pal, Prantika Bhowmik, Sushant S. Mahajan +1
One of the major sources of perturbation in the solar cycle amplitude is believed to be the emergence of anomalous active regions which do not obey Hale's polarity law and Joy's la…
Removal Of Active Region Inflows Reveals a Weak Solar Cycle Scale Trend In Near-surface Meridional Flow
Sushant S. Mahajan, Xudong Sun, Junwei Zhao
Using time-distance local helioseismology flow maps within 1 Mm of the solar photosphere, we detect inflows toward activity belts that contribute to solar cycle scale variations in…
Exploring the Solar Poles: The Last Great Frontier of the Sun
Dibyendu Nandy, Dipankar Banerjee, Prantika Bhowmik +19
Despite investments in multiple space and ground-based solar observatories by the global community, the Sun's polar regions remain unchartered territory - the last great frontier f…
Variations in Differential Rotation and Meridional Flow within the Sun's Surface Shear Layer 1996-2022
David H. Hathaway, Lisa A. Upton, Sushant S. Mahajan
We measure differential rotation and meridional flow in the Sun's surface shear layer by tracking the motions of the magnetic network seen in magnetograms from SOHO/MDI and SDO/HMI…
Improved Measurements of the Sun's Meridional Flow and Torsional Oscillation from Correlation tracking on MDI \& HMI magnetograms
Sushant S. Mahajan, David H. Hathaway, Andrés Muñoz-Jaramillo +1
The Sun's axisymmetric flows, differential rotation and meridional flow, govern the dynamics of the solar magnetic cycle and variety of methods are used to measure these flows, eac…
How to Train Your Flare Prediction Model: Revisiting Robust Sampling of Rare Events
Azim Ahmadzadeh, Berkay Aydin, Manolis K. Georgoulis +3
We present a case study of solar flare forecasting by means of metadata feature time series, by treating it as a prominent class-imbalance and temporally coherent problem. Taking f…
Toward Filament Segmentation Using Deep Neural Networks
Azim Ahmadzadeh, Sushant S. Mahajan, Dustin J. Kempton +2
We use a well-known deep neural network framework, called Mask R-CNN, for identification of solar filaments in full-disk H-alpha images from Big Bear Solar Observatory (BBSO). The…
Challenges with Extreme Class-Imbalance and Temporal Coherence: A Study on Solar Flare Data
Azim Ahmadzadeh, Maxwell Hostetter, Berkay Aydin +4
In analyses of rare-events, regardless of the domain of application, class-imbalance issue is intrinsic. Although the challenges are known to data experts, their explicit impact on…
Torsional Oscillations in the Suns rotation contribute to the Waldmeier-effect in Solar Cycles
Sushant S. Mahajan, Dibyendu Nandy, H. M. Antia +1
Temporal variations in the Suns internal velocity field with a periodicity of about 11 years have been observed over the last four decades. The period of these torsional oscillatio…
Hemispheric Preference and Cyclic Variation of Solar Filament Chirality from 2000 to 2016
Soumitra Hazra, Sushant S. Mahajan, William Keith Douglas +1
It is well known that solar filaments are features in the solar atmosphere which show a hemispheric preference in their chirality. The hemispheric preference is such that the dextr…
Complex Classical Mechanics of a QES Potential
Bhabani Prasad Mandal, Sushant S. Mahajan
We consider a Parity-time (PT) invariant non-Hermitian quasi-exactly solvable (QES) potential which exhibits PT phase transition. We numerically study this potential in a complex p…