97 citations · 322 across the 21 of their papers we have counts for
21 papers
A Probabilistic Framework for Incorporating Helioseismic Far-Side Active Regions into SFT Models
Bibhuti Kumar Jha, Lisa A. Upton, K. D. Leka +5
Surface Flux Transport (SFT) models are routinely used to model the Sun's photospheric magnetic field and provide inner boundary conditions for coronal and heliospheric models, yet…
Oscillatory Phase and Acoustic Travel-Time Inconsistencies Measured between SDO/HMI and GONG Dopplergrams
Junwei Zhao, Ruizhu Chen, S. P. Rajaguru +1
We investigate the causes of discrepancies in meridional-circulation measurements derived from the helioseismic observations by the Helioseismic and Magnetic Imager onboard the Sol…
Long-Term Clustering Pattern of Solar Active Regions and Their Potential Connection with Magneto-Rossby Waves
Junwei Zhao, Ruizhu Chen, Aimee A Norton
Large solar active regions (ARs) tend to be long lived and spatially clustered, with repeated emergence occurring in persistent solar activity nests over extended timescales. By an…
Active-region Modulation of Subsurface Meridional Flows and Magnetic Flux Transport on the Sun
Anisha Sen, S. P. Rajaguru, Ruizhu Chen +2
Using time-distance helioseismology applied to 14-years of SDO/HMI observations spanning solar cycle 24 and rising phase of cycle 25, we present evidence that meridional flows in t…
Structural Tilting and Depth-Dependent Behavior of Equatorial Rossby Waves
Oana Vesa, Junwei Zhao, Ruizhu Chen
Over the past decade, solar equatorial Rossby waves have been unambiguously identified and are considered potential diagnostics of solar interior dynamics. We investigate their inc…
Solar-cycle variations in meridional flows and rotational shear within the Sun's near-surface shear layer
Anisha Sen, S. P. Rajaguru, Abhinav Govindan Iyer +3
Using solar-cycle long helioseismic measurements of meridional and zonal flows in the near-surface shear layer (NSSL) of the Sun, we study their spatio-temporal variations and conn…
Hemispheric Magnetic Asymmetry and Cross-Equatorial Circulation Cells within the Sun's Near-Surface Shear Layer
Anisha Sen, S. P. Rajaguru, Ruizhu Chen +2
Using time-distance helioseismic measurements of meridional flow in the near-surface shear layer over a period of 14 years, starting from May 2010, we probe the depth structure and…
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…
Improving the Temporal Resolution of SOHO/MDI Magnetograms of Solar Active Regions Using a Deep Generative Model
Jialiang Li, Vasyl Yurchyshyn, Jason T. L. Wang +6
We present a novel deep generative model, named GenMDI, to improve the temporal resolution of line-of-sight (LOS) magnetograms of solar active regions (ARs) collected by the Michel…
Observed Dispersive Properties of the Slow Magnetoacoustic Waves Propagating in Coronal Fan Loops above Sunspots
Junwei Zhao, Tongjiang Wang, Ruizhu Chen
Recurrent and propagating intensity perturbations are frequently observed in extreme ultraviolet (EUV) channels along coronal fan loops above sunspots, and these perturbations are…
Inferring Maps of the Sun's Far-side Unsigned Magnetic Flux from Far-side Helioseismic Images using Machine Learning Techniques
Ruizhu Chen, Junwei Zhao, Shea Hess Webber +3
Accurate modeling of the Sun's coronal magnetic field and solar wind structures require inputs of the solar global magnetic field, including both the near and far sides, but the Su…
Seismic Monitoring of the Sun's Far Hemisphere: A Crucial Component in Future Space Weather Forecasting (A White Paper Submitted to the Decadal Survey for Solar and Space Physics (Heliophysics) -- SSPH 2024-2033)
Kiran Jain, C. Lindsey, E. Adamson +20
The purpose of this white paper is to put together a coherent vision for the role of helioseismic monitoring of magnetic activity in the Sun's far hemisphere that will contribute t…
Phase Shifts Measured in Evanescent Acoustic Waves above the Solar Photosphere and Their Possible Impacts to Local Helioseismology
Junwei Zhao, S. P. Rajaguru, Ruizhu Chen
A set of 464-min high-resolution high-cadence observations were acquired for a region near the Sun's disk center using the Interferometric BI-dimensional Spectrometer (IBIS) instal…
1000x Faster Camera and Machine Vision with Ordinary Devices
Tiejun Huang, Yajing Zheng, Zhaofei Yu +13
In digital cameras, we find a major limitation: the image and video form inherited from a film camera obstructs it from capturing the rapidly changing photonic world. Here, we pres…
Long-Term Variation of Helioseismic Far-Side Images and What Causes It
Junwei Zhao, Grace Y. Jing, Ruizhu Chen
A new time--distance far-side imaging technique was recently developed by utilizing multiple multi-skip acoustic waves. The measurement procedure is applied to 11 years of Doppler…
A Possible Selection Rule for Flares Causing Sunquakes
Ruizhu Chen, Junwei Zhao
Sunquakes are helioseismic power enhancements initiated by solar flares, but not all flares generate sunquakes. It is curious why some flares cause sunquakes while others do not. H…
Imaging the Sun's Far-Side Active Regions by Applying Multiple Measurement Schemes on Multi-Skip Acoustic Waves
Junwei Zhao, Dominick Hing, Ruizhu Chen +1
Being able to image active regions on the Sun's far side is useful for modeling the global-scale magnetic field around the Sun, and for predicting the arrival of major active regio…
A Comprehensive Method to Measure Solar Meridional Circulation and Center-to-Limb Effect Using Time-Distance Helioseismology
Ruizhu Chen, Junwei Zhao
Meridional circulation is a crucial component of the Sun's internal dynamics, but its inference in the deep interior is complicated by a systematic center-to-limb effect in heliose…
Investigating the Magnetic Imprints of Major Solar Eruptions with SDO/HMI High-Cadence Vector Magnetograms
Xudong Sun, J. Todd Hoeksema, Yang Liu +2
The solar active region photospheric magnetic field evolves rapidly during major eruptive events, suggesting appreciable feedback from the corona. Previous studies of these "magnet…
Detection of Fast-Moving Waves Propagating Outward along Sunspots' Radial Direction in the Photosphere
Junwei Zhao, Ruizhu Chen, Thomas Hartlep +1
Helioseismic and magnetohydrodynamic waves are abundant in and above sunspots. Through cross-correlating oscillation signals in the photosphere observed by the SDO/HMI, we reconstr…
Noiseless Gravitational Lensing Simulations
Raul E. Angulo, Ruizhu Chen, Stefan Hilbert +1
The microphysical properties of the DM particle can, in principle, be constrained by the properties and abundance of substructures in DM halos, as measured through strong gravitati…