157 citations · 1.1k across the 33 of their papers we have counts for
33 papers
Evidence For The Magnetic Breakout Model in an Equatorial Coronal-Hole Jet
Pankaj Kumar, Judith T. Karpen, Spiro K. Antiochos +3
Small, impulsive jets commonly occur throughout the solar corona, but are especially visible in coronal holes. Evidence is mounting that jets are part of a continuum of eruptions t…
Multiwavelength Observations of a Flux Rope Formation by Series of Magnetic Reconnection in the Chromosphere
Pankaj Kumar, Vasyl Yurchyshyn, Kyung-Suk Cho +1
Using high-resolution observations from the 1.6 m New Solar Telescope (NST) operating at the Big Bear Solar Observatory (BBSO), we report direct evidence of merging/reconnection of…
Observation of a Short Period Quasi-Periodic Pulsation in Solar X-ray, Microwave and EUV Emissions
Pankaj Kumar, Valery M. Nakariakov, Kyung-Suk Cho
This paper presents the multi-wavelength analysis of a 13 s quasi-periodic pulsation (QPP) observed in hard X-ray (12-300 keV) and microwave (4.9-34 GHz) emissions during a C-class…
New agegraphic dark energy in Brans-Dicke theory with logarithmic form of scalar field
Pankaj Kumar, C. P. Singh
In a very recent paper, the current authors (arXiv:gr-qc/1609.01477) have proposed and analyzed in detail the logarithmic form of Brans-Dicke scalar field as $ϕ\propto ln(α+βa)…
Holographic dark energy in Brans-Dicke theory with logarithmic form of scalar field
C P Singh, Pankaj Kumar
In this paper, an interacting holographic dark energy model with Hubble horizon as an infra-red cut-off is considered in the framework of Brans-Dicke theory. We propose a logarithm…
Flare Generated Shock Wave Propagation Through Solar Coronal Arcade Loops and Associated Type II Radio Burst
Pankaj Kumar, D. E. Innes, K. S. Cho
This paper presents multiwavelength observations of a flare-generated type II radio burst. The kinematics of the shock derived from the type II closely match a fast EUV wave seen p…
Observations of a Series of Flares and Associated Jet-like Eruptions Driven by the Emergence of Twisted Magnetic Fields
Eun-Kyung Lim, Vasyl Yurchyshyn, Sung-Hong Park +8
We studied temporal changes of morphological and magnetic properties of a succession of four confined flares followed by an eruptive flare using the high-resolution New Solar Teles…
Formation and Eruption of a Small Flux Rope in the Chromosphere Observed by NST, IRIS, and SDO
Pankaj Kumar, Vasyl Yurchyshyn, Haimin Wang +1
Using high-resolution images from 1.6 m New Solar Telescope (NST) at Big Bear Solar Observatory (BBSO), we report the direct evidence of chromospheric reconnection at the polarity…
Holographic dark energy models with statefinder diagnostic in modified gravity
C. P. Singh, Pankaj Kumar
We study non-viscous and viscous holographic dark energy models for a homogeneous and isotropic flat Friedmann-Robertson-Walker Universe in gravity. We find that the Hubbl…
Multiwavelength observation of a large-scale flux rope eruption above kinked mini-filament
Pankaj Kumar, Kyung-Suk Cho
We analyse multiwavelength observations of a western limb flare (C3.9) occurred in AR NOAA 111465 on 30 April 2012. The high resolution images recorded by SDO/AIA 304, 1600 Å and H…
SDO/AIA Observations of a Reflecting Longitudinal Wave in a Coronal Loop
Pankaj Kumar, D. E. Innes, B. Inhester
We report high resolution observations from the SDO/AIA of intensity oscillations in a hot, T~8-10 MK, loop. The AIA images show a large coronal loop that was rapidly heated follow…
Friedmann model with viscous cosmology in modified gravity theory
C. P. Singh, Pankaj Kumar
In this paper, we introduce bulk viscosity in the formalism of modified gravity theory in which the gravitational action contains a general function , where and den…
Study of Magnetic Helicity Injection in the Active Regions NOAA 9236 Producing Multiple Flare-associated CME Events
Sung-Hong Park, Kanya Kusano, Kyung-Suk Cho +6
To better understand a preferred magnetic field configuration and its evolution during Coronal Mass Ejection events, we investigated the spatial and temporal evolution of photosphe…
Simultaneous EUV and Radio Observations of Bidirectional Plasmoids Ejection During Magnetic Reconnection
Pankaj Kumar, K. S. Cho
We present a multiwavelength study of the X-class flare, which occurred in active region (AR) NOAA 11339 on 3 November 2011. The EUV images recorded by SDO/AIA show the activation…
Multiwavelength Observations of an Eruptive Flare: Evidence for Blast Waves and Break-out
Pankaj Kumar, D. E. Innes
Images of an east-limb flare on 3 November 2010 taken in the 131 Å channel of the Atmospheric Imaging Assembly onboard the Solar Dynamics Observatory provide a convincing example o…
Eruption of a plasma blob, associated M-class flare, and large-scale EUV wave observed by SDO
Pankaj Kumar, P. K. Manoharan
We present a multiwavelength study of the formation and ejection of a plasma blob and associated EUV waves in AR NOAA 11176, observed by SDO/AIA and STEREO on 25 March 2011. SDO/AI…
Multiwavelength study of a Solar Eruption from AR NOAA 11112: II. Large-Scale Coronal Wave and Loop Oscillation
Pankaj Kumar, K. -S. Cho, P. F. Chen +2
We analyse multiwavelength observations of an M2.9/1N flare that occurred in AR NOAA 11112 on 16 October 2010. AIA 211 Å EUV images reveal the presence of a faster coronal wave (de…
Multiwavelength study of a Solar Eruption from AR NOAA 11112 I. Flux Emergence, Sunspot Rotation and Triggering of a Solar Flare
Pankaj Kumar, Sung-Hong Park, K. -S. Cho +1
We analyse the multiwavelength observations of an M2.9/1N flare that occurred in the active region (AR) NOAA 11112 in the vicinity of a huge filament system on 16 October 2010. SDO…
Observations of Multiple Surges Associated with Magnetic Activities in AR10484 on 25 October 2003
Wahab Uddin, B. Schmieder, R. Chandra +3
We present a multiwavelength study of recurrent surges observed in Hα, UV (SOHO/EIT) and Radio (Learmonth, Australia) from the super-active region NOAA 10484 on 25 October, 2003. S…
Multiwavelength Observations of Supersonic Plasma Blob Triggered by Reconnection Generated Velocity Pulse in AR10808
A. K. Srivastava, R. Erdelyi, K. Murawski +1
Using multi-wavelength observations of Solar and Heliospheric Observatory (SoHO)/Michelson Doppler Imager (MDI), Transition Region and Coronal Explorer (TRACE) 171 Å, and H from…
The Occurrence and Speed of CMEs Related to Two Characteristic Evolution Patterns of Helicity Injection in Their Solar Source Regions
Sung-Hong Park, Kyung-Suk Cho, Su-Chan Bong +4
Long-term (a few days) variation of magnetic helicity injection was calculated for 28 solar active regions which produced 47 CMEs to find its relationships with the CME occurrence…
Initiation of CME and Associated Flare Caused by Helical Kink Instability Observed by SDO/AIA
Pankaj Kumar, K. -S. Cho, S. -C. Bong +2
In this paper, we present multiwavelength observations of helical kink instability as a trigger of a CME which occurred in AR NOAA 11163 on 24 February 2011. The CME was associated…
Transient induced MHD oscillations : A tool to probe the solar active regions
Abhishek K. Srivastava, V. M. Nakariakov, B. N. Dwivedi +1
Solar transients and eruptive phenomena which are ubiquitous in the solar atmosphere, can shed new light to the understanding of the outstanding problems like coronal heating and t…
On the Triggering of M-Class Solar Flare due to Loop-loop Interaction in AR NOAA 10875
Pankaj Kumar, Abhishek K. Srivastava, B. V. Somov +3
We present multiwavelength analysis of an M7.9 /1N solar flare which occurred on 27 April 2006 in AR NOAA 10875. The flare was triggered due to the interaction of two loop systems.…