89 citations · 731 across the 35 of their papers we have counts for
37 papers · 1 filter
Coronal Green-Line Emission During a Solar Prominence Eruption: Spectroscopic Evidence of Its Correspondence with the EUV Late Phase
P. Vemareddy, R. Ramesh, V. Muttu Priyal
We report spectroscopic observations during a prominence eruption on 9 October 2025 from the Sun's west limb, associated with an M2.0 flare that commenced at 12:11 UT. The event wa…
Formation and Eruption of Filament Channel in Solar Active Region 12975: Insights from Observations and Simulations of Magnetic Field Evolution
Dinesh Mishra, P. Vemareddy, Brajesh Kumar
We studied the magnetic field evolution of active region (AR) 12975 using a time-dependent magnetofrictional (TMF) model. This AR produced two consecutive CMEs associated with M-cl…
Understanding the formation and eruption of sigmoidal structure through data-driven modeling of magnetic evolution in solar active region 13500
P. Vemareddy, S. Nair, S. Gosain
We investigate the magnetic origin of the coronal mass ejection (CME) that occurred on November 28, 2023, at 19:50UT from active region (AR) 13500 located near the solar disk-cente…
An intense geomagnetic storm originated from stealth Coronal Mass Ejection: remote and observations by near radially aligned spacecraft
P. Vemareddy, K. Selva Bharathi
We investigate the solar origin and heliospheric evolution of an intense geomagnetic storm that occurred on March 23-24, 2023. Despite multiple candidate CMEs observed between Marc…
Visible Emission Line Coronagraph (VELC) onboard ADITYA-L1
Jagdev Singh, R. Ramesh, B. Raghavendra Prasad +21
Aditya-L1, India's first dedicated mission to study the Sun and its atmosphere from the Sun-Earth Lagrangian L1 location was successfully launched on 2023 September 2. It carries s…
Magnetic evolution of active regions: formation and eruption of magnetic flux ropes
P. Vemareddy
Magnetic flux ropes (FRs) are twisted structures appearing on the sun, predominantly in the magnetically concentrated regions. These structures appear as coronal features known as…
Simulating the formation and eruption of flux rope by magneto-friction model driven by time-dependent electric fields
P. Vemareddy
Aiming to capture the formation and eruption of flux ropes (FRs) in the source active regions (ARs), we simulate the coronal magnetic field evolution of the AR 11429 employing the…
Data-driven simulations of magnetic field evolution in Active Region 11429: Magneto-friction method using PENCIL code
P. Vemareddy, Jörn Warnecke, Ph. A. Bourdin
Coronal magnetic fields evolve quasi statically over long time scales and dynamically over short time scales. As of now there exists no regular measurements of coronal magnetic fie…
Filament eruption from active region 13283 leading to fast halo-CME and intense geomagnetic storm on 23 April 2023
P. Vemareddy
Using multi-instrument and multi-wavelength observations, we studied a CME eruption that led to intense geomagnetic storm on 23 April 2023. The eruption occurred on April 21 in sol…
Data processing of Visible Emission Line Coronagraph Onboard ADITYA L1
Muthu Priyal, Jagdev Singh, B. Raghavendra Prasad +28
ADITYA-L1 is India's first dedicated mission to observe the sun and its atmosphere from a halo orbit around L1 point. Visible emission line coronagraph (VELC) is the prime payload…
Nature of helicity injection in non-erupting solar active regions
P. Vemareddy
Using time-sequence vector magnetic field and coronal observations from \textit{Solar Dynamics Observatory}, we report the observations of the magnetic field evolution and coronal…
Eruption of EUV Hot-Channel near Solar Limb and Associated Moving Type-IV Radio Burst
P. Vemareddy, P. Démoulin, K. Sasikumar Raja +3
Using the observations from Solar Dynamics Observatory, we study an eruption of a hot-channel flux rope (FR) near the solar-limb on February 9, 2015. The pre-eruptive structure is…
Magnetic imprints of eruptive and non-eruptive Solar flares as observed by Solar Dynamics Observatory
N. Vasantharaju, P. Vemareddy, B. Ravindra +1
The abrupt and permanent changes of photospheric magnetic field in the localized regions of active regions during solar flares called magnetic imprints (MIs), have been observed fo…
Magnetic Structure in Successively Erupting Active Regions: Comparison of Flare-Ribbons with Quasi-Separatrix Layers
P. Vemareddy
This paper studies the magnetic topology of successively erupting active regions (ARs) 11429 and 12371. Employing vector magnetic field observations from Helioseismic and Magnetic…
Successive Injection of Opposite Magnetic Helicity: Evidence for Active Regions without Coronal Mass Ejections
P. Vemareddy
Magnetic helicity (MH) is a measure of twist and shear of magnetic field. MH is injected in the active region (AR) corona through photospheric footpoint motions causing twisted and…
Recurring Homologous Solar Eruptions in NOAA AR 11429
Suman K. Dhakal, Jie Zhang, Panditi Vemareddy +1
We present the study of three homologous solar eruptions from NOAA active region (AR) 11429 over four days. This large and complex AR divided into two relatively simple sub-regions…
Finding the critical decay index in solar prominence eruptions
N. Vasantharaju, P. Vemareddy, B. Ravindra +1
The background field is assumed to play prime role in the erupting structures like prominences. In the flux rope models, the critical decay index () is a measure of the rate a…
Degree of electric current neutralization and the activity in solar Active Regions
P. Vemareddy
Using time-sequence vector magnetic field observation from \textit{Helioseismic and Magnetic Imager}, we examined the connection of non-neutralized currents and the observed activi…
Formation and eruption of sigmoidal structure from a weak field region of NOAA 11942
N. Vasantharaju, P. Vemareddy, B. Ravindra +1
Using observations from Solar Dynamics Observatory, we studied an interesting example of a sigmoid formation and eruption from small-scale flux canceling regions of active region (…
Very fast helicity injection leading to critically stable state and large eruptive activity in solar active region NOAA 12673
P. Vemareddy
Using the photospheric magnetic and coronal observations of Solar Dynamics Observatory, we studied the build-up and eruption of coronal non-potential magnetic structure in emerging…
Magnetohydrodynamic Simulation of the X9.3 Flare on 2017 September 6: Evolving Magnetic Topology
Chaowei Jiang, Peng Zou, Xueshang Feng +7
Three-dimensional magnetic topology is crucial to understanding the explosive release of magnetic energy in the corona during solar flares. Much attention has been given to the pre…
Statistical study of magnetic non-potential measures in confined and eruptive flares
N. Vasantharaju, P. Vemareddy, B. Ravindra +1
Using the HMI/SDO vector magnetic field observations, we studied the relation of degree of magnetic non-potentiality with the observed flare/CME in active regions. From a sample of…
Study of Three-Dimensional Magnetic Structure and the Successive Eruptive Nature of Active Region 12371
P. Vemareddy, P. Demóulin
We study the magnetic structure of successively erupting sigmoid in active region 12371 by modeling the quasi-static coronal field evolution with non-linear force-free field (NLFFF…
Prominence eruption initiated by helical kink-instability of an embedded flux rope
P. Vemareddy, N. Gopalswamy, B. Ravindra
We study the triggering mechanism of a limb-prominence eruption and the associated coronal mass ejection near AR 12342 using SDO and LASCO/SOHO observations. The prominence is seen…