Publications (17)
The transition from eruptive to confined flares in the same active region
F. P. Zuccarello, R. Chandra, B. Schmieder +2
Solar flares are sudden and violent releases of magnetic energy in the solar atmosphere that can be divided in eruptive flares, when plasma is ejected from the solar atmosphere, re…
Solar Jet on 2014 April 16 Modeled by Kelvin--Helmholtz Instability
M. Bogdanova, I. Zhelyazkov, R. Joshi +1
We study here the arising of Kelvin--Helmholtz Instability (KHI) in one fast jet of 2014 April 16 observed by the Atmospheric Imaging Assembly (AIA) on board Solar Dynamics Observa…
Deciphering the solar coronal heating: Energizing small-scale loops through surface convection
D. Nóbrega-Siverio, F. Moreno-Insertis, K Galsgaard +4
The solar atmosphere is filled with clusters of hot small-scale loops commonly known as Coronal Bright Points (CBPs). These ubiquitous structures stand out in the Sun by their stro…
Baryonic Ecosystem in Galaxies (BEINGMgII) -- II. Unveiling the Nature of Galaxies Harboring Cool Gas Reservoirs
S. Das, R. Joshi, R. Chaudhary +4
We search for the galaxies associated with the intervening MgII absorbers over a redshift range of using imaging data from DESI Legacy Imaging Surveys and measu…
Slippage of Jets Explained by the Magnetic Topology of NOAA Active Region 12035
R. Joshi, B. Schmieder, R. Chandra +3
In this study, we present the investigation of eleven recurring solar jets originated from two different sites (site 1 and site 2) close to each other (~ 11 Mm) in the NOAA active…
Synthesizing Sun-as-a-star flare spectra from high-resolution solar observations
M. De Wilde, A. G. M. Pietrow, M. K. Druett +22
Spatially resolved observations of the Sun and the astronomical sample size of stellar bodies are the respective key strengths of solar and stellar observations. However, the large…
Discovery of a red quasar with recurrent activity
S. Nandi, R. Roy, D. J. Saikia +6
We report a new double-double radio quasar, DDRQ, J07464526 which exhibits two cycles of episodic activity. From radio continuum observations at 607 MHz using the GMRT and 1400…
Observations of Two Successive EUV Waves and their Mode Conversion
R. Chandra, P. F. Chen, R. Joshi +2
In this paper, we present the observations of two successive fast-mode extreme ultraviolet (EUV) wave events observed on 2016 July 23. Both fast-mode waves were observed by the Atm…
Thin coronal jets and plasmoid-mediated reconnection: Insights from Solar Orbiter observations and Bifrost simulations
D. Nóbrega-Siverio, R. Joshi, E. Sola-Viladesau +2
Coronal jets are ubiquitous, collimated million-degree ejections that contribute to the energy and mass supply of the upper solar atmosphere and the solar wind. Solar Orbiter provi…
The Birth of a Major Coronal Mass Ejection with Intricate Magnetic Structure from Multiple Active Regions
Jinhan Guo, Y. W. Ni, B. Schmieder +9
Coronal mass ejections (CMEs) are the eruptions of magnetised plasma from the Sun and are considered the main driver of adverse space weather events. Hence, undrstanding its format…
IRIS NUV diagnostics for Ellerman bombs: spectral properties, thermodynamics, and formation height
I. J. Soler Poquet, C. J. DÃaz Baso, A. Sainz Dalda +3
Context. Ellerman bombs (EBs) are observational signatures of small-scale magnetic reconnection, key to understanding the lower solar atmosphere. While their role in active regions…
Small-scale magnetic flux emergence preceding a chain of energetic solar atmospheric events
D. Nóbrega-Siverio, I. Cabello, S. Bose +4
Advancements in instrumentation have revealed a multitude of small-scale EUV events in the solar atmosphere. Our aim is to employ high-resolution magnetograms to gain a detailed un…
On the incidence of MgII absorbers along the blazar sightlines
S. Mishra, H. Chand, Gopal-Krishna +3
It is widely believed that the cool gas clouds traced by MgII absorption, within a velocity offset of 5000 km/s relative to the background quasar are mostly associated with the qua…
Incidence of HI 21-cm absorption in strong FeII systems at
R. Dutta, R. Srianand, N. Gupta +5
We present the results from our search for HI 21-cm absorption in a sample of 16 strong FeII systems ((MgII ) Ã and (FeII )…
Two Step Filament Eruption During 14-15 March 2015
R. Chandra, B. Filippov, R. Joshi +1
We present here an interesting two-step filament eruption during 14-15 March 2015. The filament was located in NOAA AR 12297 and associated with a halo Coronal Mass Ejection (CME).…
Formation and rising phase of a flux rope through data-constrained simulations
M. V. Sieyra, A. Strugarek, A. Prasad +8
Context. Data-constrained models incorporate observed photospheric magnetic fields. However, due to the lack of magnetic field information in the rest of the solar atmosphere, mode…
Nature of Intra-night Optical Variability of BL Lacertae
Haritma Gaur, Alok C. Gupta, R. Bachev +13
We present the results of extensive multi-band intra-night optical monitoring of BL Lacertae during 2010--2012. BL Lacertae was very active in this period and showed intense variab…