116 citations · 540 across the 29 of their papers we have counts for
29 papers
Ground-based monitoring of the variability of visible Solar spectral lines for improved understanding of solar and stellar magnetism and dynamics
S. Criscuoli, L. Bertello, D. P. Choudhary +7
Long-term high-cadence measurements of stellar spectral variability are fundamental to better understand stellar atmospheric properties and stellar magnetism. These, in turn, are f…
Understanding Sun-as-a-star variability of solar Balmer lines
Serena Criscuoli, Sergey Marchenko, Matthew DeLand +2
Precise, high-cadence, long-term records of stellar spectral variability at different temporal scales lead to better understanding of a wide variety of phenomena including stellar…
Sustained heating of the chromosphere and transition region over a sunspot light bridge
Rohan E. Louis, Shibu K. Mathew, A. Raja Bayanna +2
Sunspot light bridges (LBs) exhibit a wide range of short-lived phenomena in the chromosphere and transition region. In contrast, we use here data from the Multi-Application Solar…
The magnetic topology of the inverse Evershed flow
A. Prasad, M. Ranganathan, C. Beck +2
The inverse Evershed flow (IEF) is a mass motion towards sunspots at chromospheric heights. We combined high-resolution observations of NOAA 12418 from the Dunn Solar Telescope and…
Velocities of an Erupting Filament
Shuo Wang, Jack M. Jenkins, Karin Muglach +5
Solar filaments exist as stable structures for extended periods of time before many of them form the core of a CME. We examine the properties of an erupting filament on 2017 May 29…
Heating of the solar chromosphere in a sunspot light bridge by electric currents
Rohan E. Louis, Avijeet Prasad, Christian Beck +2
Context: Resistive Ohmic dissipation has been suggested as a mechanism for heating the solar chromosphere, but few studies have established this association. Aim: We aim to determi…
The formation of an atypical sunspot light bridge as a result of large-scale flux emergence
Rohan E. Louis, Christian Beck, Debi P. Choudhary
We use a combination of full-disk data from the Solar Dynamics Observatory and high-resolution data from the Dunn Solar Telescope (DST) to study the formation, structure, and evolu…
Center-to-Limb Variation of the Inverse Evershed Flow
C. Beck, D. P. Choudhary, M. Ranganathan
We present the properties of the inverse Evershed flow (IEF) based on the center-to-limb variation of the plasma speed and loop geometry of chromospheric superpenumbral fibrils in…
Temporal Evolution of the Inverse Evershed Flow
C. Beck, D. P. Choudhary
The inverse Evershed flow (IEF) is an inflow of material into the penumbra of sunspots in the solar chromosphere that occurs along dark, elongated superpenumbral fibrils extending…
Magnetic Properties and Flow Angle of the Inverse Evershed Flow at Its Downflow Points
C. Beck, D. P. Choudhary
We determined the direction and strength of the photospheric and lower chromospheric magnetic field in the umbra and penumbra of a sunspot from inversions of spectropolarimetric ob…
Evolution of Photospheric Vector Magnetic Field Associated with Moving Flare Ribbons As Seen By GST
Chang Liu, Wenda Cao, Jongchul Chae +7
The photospheric response to solar flares, also known as coronal back reaction, is often observed as sudden flare-induced changes in vector magnetic field and sunspot motions. Howe…
Super Penumbral Chromospheric Flare
S. Liu, H. Q. Zhang, D. P. Choudhary +2
We observed a C-class flare at the outer boundary of the super-penumbra of a sunspot. The flare was triggered by an emerging magnetic bipolar region that was obliquely oriented wit…
Thermodynamic Properties of the Evershed Flow in the Lower Chromosphere
Debi Prasad Choudhary, Christian Beck
We used spectropolarimetric observations of a sunspot in active region NOAA 11809 in the Ca ii line at 854.2 nm taken with the SpectroPolarimeter for Optical and Infrared Regions (…
High-resolution Observations of Halpha Spectra with a Subtractive Double Pass
C. Beck, R. Rezaei, D. Prasad Choudhary +3
High-resolution imaging spectroscopy in solar physics has relied on Fabry-Perot Interferometers (FPIs) in recent years. FPI systems, however, get technically challenging and expens…
Fast inversion of solar Ca II spectra
C. Beck, D. Prasad Choudhary, R. Rezaei +1
We present a fast (<< 1 s per profile) inversion code for solar Ca II lines. The code uses an archive of spectra that are synthesized prior to the inversion under the assumption of…
A three-dimensional view of the thermal structure in a super-penumbral canopy
C. Beck, D. Prasad Choudhary, R. Rezaei
We investigate the thermal topology in a super-penumbral canopy by determining the 3D thermal structure of an active region. We derive the temperature stratifications in the active…
Multi-wavelength Diagnostics of the Precursor and Main phases of an M1.8 Flare on 2011 April 22
A. K. Awasthi, R. Jain, P. D. Gadhiya +12
We study the temporal, spatial and spectral evolution of the M1.8 flare, which occurred in NOAA AR 11195 (S17E31) on 22 April 2011, and explore the underlying physical processes du…
He I D3 Observation of the 1984 May 22 M6.3 Solar Flare
Chang Liu, Yan Xu, Na Deng +4
He I D3 line has a unique response to the flare impact on the low solar atmosphere and can be a powerful diagnostic tool for energy transport processes. Using images obtained from…
A Multiwavelength Study of Eruptive Events on January 23, 2012 Associated with a Major Solar Energetic Particle Event
N. C. Joshi, W. Uddin, A. K. Srivastava +15
We use multiwavelength data from space and ground based instruments to study the solar flares and coronal mass ejections (CMEs) on January 23, 2012 that were responsible for one of…
Height of Shock Formation in the Solar Corona Inferred from Observations of Type II Radio Bursts and Coronal Mass Ejections
N. Gopalswamy, H. Xie, P. Mäkelä +12
Employing coronagraphic and EUV observations close to the solar surface made by the Solar Terrestrial Relations Observatory (STEREO) mission, we determined the heliocentric distanc…
Rapid Enhancement of Sheared Evershed Flow Along the Neutral Line Associated with an X6.5 Flare Observed by Hinode
Na Deng, Chang Liu, Debi Prasad Choudhary +1
We present G-band and Ca II H observations of NOAA AR 10930 obtained by Hinode/SOT on 2006 December 6 covering an X6.5 flare. Local Correlation Tracking (LCT) technique was applied…
What determines the penumbral size and Evershed flow speed?
Na Deng, Toshifumi Shimizu, Debi Prasad Choudhary +1
Using Hinode SP and G-band observations, we examined the relationship between magnetic field structure and penumbral size as well as Evershed flow speed. The latter two are positiv…
On the Doppler Shift and Asymmetry of Stokes Profiles of Photospheric FeI and Chromospheric MgI Lines
Na Deng, Debi Prasad Choudhary, K. S. Balasubramaniam
We analyzed the full Stokes spectra using simultaneous measurements of the photospheric (FeI 630.15 and 630.25 nm) and chromospheric (MgI b2 517.27 nm) lines. The data were obtaine…
Stokes Profiles at the Narrow Magnetic Lanes of Sun Spots
Gordon A. MacDonald, Kemal A. Yassin, Debi Prasad Choudhary
It has been previously observed that narrow lanes of transverse and longitudinal magnetic field with opposite polarity are the site of large solar flares. We performed a comprehens…