Publications (20)
Dynamics and Kinematics of the EUV Wave Event on 6 May 2019
Ramesh Chandra, P. F. Chen, Pooja Devi +2
We present here the kinematics of the EUV wave associated with a GOES M1.0-class solar flare, which originates in NOAA AR 12740. The event is thoroughly observed with Atmospheric I…
Observational Characteristics of solar EUV waves
Ramesh Chandra, Pooja Devi, P. F. Chen +4
Extreme-ultraviolet (EUV) waves are one of the large-scale phenomena on the Sun. They are defined as large propagating fronts in the low corona with speeds ranging from a few tens…
Filament Eruption Driving EUV Loop Contraction then Expansion above a Stable Filament
Ramesh Chandra, Pascal Demoulin, Pooja Devi +2
We analyze the observations of EUV loop evolution associated with the filament eruption located at the border of an active region. The event SOL2013-03-16T14:00 was observed with a…
Relationship between prominence eruptions and coronal mass ejections during solar cycle 24
Pooja Devi, Nat Gopalswamy, Seiji Yashiro +3
In this article, we present the relationship between prominence eruptions (PEs) and coronal mass ejections (CMEs) from May 2010 to December 2019 covering most of solar cycle 24. We…
Magnetic Reconnection between a Solar Jet and a Filament Channel
Garima Karki, Brigitte Schmieder, Pooja Devi +4
The solar corona is highly structured by bunches of magnetic field lines forming either loops, or twisted flux ropes representing prominences/filaments, or very dynamic structures…
Extreme-Ultraviolet Wave and Accompanying Loop Oscillations
Pooja Devi, Ramesh Chandra, Arun Kumar Awasthi +2
We present the observations of an extreme-ultraviolet (EUV) wave, which originated from the active region (AR) NOAA 12887 on 28 October 2021 and its impact on neighbouring loops. T…
Fine Structures of an EUV Wave Event from Multi-Viewpoint Observations
Ramesh Chandra, P. F. Chen, Pooja Devi +3
In this study, we investigate an extreme ultraviolet (EUV) wave event on 2010 February 11, which occurred as a limb event from the Earth viewpoint and a disk event from the STEREO-…
Counter-Streaming Velocities in a Quiescent Filament
Garima Karki, Brigitte Schmieder, Pascal Demoulin +3
Filaments/prominences are cold plasma (~ 10000 K) embedded in the solar corona, two orders of magnitude hotter. Filament plasma is structured by the magnetic field in thin elongate…
Sympathetic Quiet and Active Region Filament Eruptions
Kostadinka Koleva, Pooja Devi, Ramesh Chandra +3
We present the observations of three sympathetic filament eruptions occurring on 19 July 2015 namely F1, F2, and F3. The events were observed in UV/EUV wavelengths by Atmospheric I…
Variation of Chromospheric Features as a Function of Latitude and Time using Ca-K Spectroheliograms for Solar Cycles 15-23: Implications for Meridional Flow
Pooja Devi, Jagdev Singh, Ramesh Chandra +2
We have analysed the Ca-K images obtained at Kodaikanal Observatory as a function of latitude and time for the period of 1913 - 2004 covering the Solar Cycle 15 to 23. We have clas…
Direct evidence of hybrid nature of EUV waves and the reflection of the fast-mode wave
Ramesh Chandra, P. F. Chen, Pooja Devi
We performed an analysis of the extreme-ultraviolet (EUV) wave event on 2022 March 31. The event originated from active region (AR) 12975 located at N13W52 in the field of view of…
Two Cases of Non-Radial Filament Eruption and Associated CME Deflection
Kostadinka Koleva, Ramesh Chandra, Pooja Devi +2
The purpose of this paper is to analyze the multi-wavelength and multi-instrument observations of two quiescent filament eruptions as well as the deflection of associated CMEs from…
A case-study of multi-temperature coronal jets for emerging flux MHD models
Reetika Joshi, Ramesh Chandra, Brigitte Schmieder +4
Context: Hot coronal jets are a basic observed feature of the solar atmosphere whose physical origin is still being actively debated. Aims: We study six recurrent jets occurring in…
EUV Wave and Coronal Seismology
Pooja Devi, Ramesh Chandra, Arun Kumar Awasthi +2
We present an investigation of the Extreme-Ultraviolet (EUV) wave linked to the flare that occurred on 28 October 2021, along with the associated coronal loop oscillation and type…
Development of a Confined Circular-cum-parallel Ribbon Flare and Associated Pre-flare Activity
Pooja Devi, Bhuwan Joshi, Ramesh Chandra +3
We study a complex GOES M1.1 circular ribbon flare and related pre-flare activity on 26 January 2015 [SOL26-01-2015] in solar active region NOAA 12268. This flare activity was obse…
Type II radio bursts and space weather phenomena: A statistical study
Pooja Devi, Rositsa Miteva, Ramesh Chandra +2
In this paper, we present for the first time a comprehensive statistical study between type II radio bursts from the metric (m) to the dekameric-hectometric (DH) domain and their a…
Prominence Oscillations activated by an EUV wave
Pooja Devi, Ramesh Chandra, Reetika Joshi +4
Prominence oscillations are one of interesting phenomena in the solar atmosphere, which can be utilized to infer the embedded magnetic field magnitude. We present here the transver…
Observations of a prominence eruption and loop contraction
Pooja Devi, Pascal Démoulin, Ramesh Chandra +3
Context. Prominence eruptions provide key observations to understand the launch of coronal mass ejections as their cold plasma traces a part of the unstable magnetic configuration.…
Band Splitting in m-Type II radio Bursts and their Role in Coronal Parameter Diagnostics
Pooja Devi, Ramesh Chandra, Rositsa Miteva +2
Type II radio bursts are signatures of shock waves generated by solar eruptions, observed at radio wavelengths. While metric (m) type II bursts originate in the lower corona, their…
Partial Null Point Reconnection of an Eruptive Filament
Pooja Devi, Cristina H. Mandrini, Ramesh Chandra +4
Solar filaments are cool and dense plasma structures suspended in the solar corona against gravity. We present observations of a quiescent filament eruption that occurs on 13 July…