Browsing by Subject "Sun: coronal mass ejections (CMEs)"

The Aditya-L1 mission of ISRO

Tripathi, Durgesh; Chakrabarty, D; Nandi, A; Prasad, B. R; Ramaprakash, A. N; Shaji, Nigar; Sankarasubramanian, K; Satheesh Thampi, R; Yadav, V. K (Cambridge University Press on behalf of International Astronomical Union, 2023)

The Aditya-L1 is the first space-based solar observatory of the Indian Space Research Organization (ISRO). The spacecraft will carry seven payloads providing uninterrupted observations of the Sun from the first Lagrangian ...

Automated Detection of Coronal Mass Ejections in Stereo Heliospheric Imager Data

Pant, V; Willems, S; Rodriguez, L; Mierla, M; Banerjee, D; Davies, J. A (IOP Publishing, 2016-12-10)

We present deep Very Large Array imaging of 3C 273 in order to determine the diffuse, large scale radio structure of this famous radio-loud quasar. Diffuse extended structure (radio lobes) is detected for the first time ...

Comparison of Magnetic Properties in a Magnetic Cloud and Its Solar Source on 2013 April 11-14

Vemareddy, P; Mostl, C; Amerstorfer, T; Mishra, W; Farrugia, C; Leitner, M (IOP Publishing, 2016-06)

In the context of the Sun–Earth connection of coronal mass ejections and magnetic flux ropes (MFRs), we studied the solar active region (AR) and the magnetic properties of magnetic cloud (MC) event during 2013 April ...

Constraining the solar coronal magnetic field strength using split-band type ii radio burst observations

Kishore, P; Ramesh, R; Hariharan, K; Kathiravan, C; Gopalswamy, N (IOP Publishing, 2016-11-20)

We report on low-frequency radio (85–35 MHz) spectral observations of four different type II radio bursts, which exhibited fundamental-harmonic emission and split-band structure. Each of the bursts was found to be closely ...

Contribution of Field Strength Gradients to the Net Vertical Current of Active Regions

Vemareddy, P (IOP Publishing, 2017-12)

We examined the contribution of fi eld strength gradients for the degree of net vertical current ( NVC ) neutralization in active regions ( ARs ) . We used photospheric vector magnetic fi eld observations of ...

Direct estimates of the solar coronal magnetic field using contemporaneous extremeultraviolet, radio, and white-light observations

Anshu Kumari; Ramesh, R; Kathiravan, C; Wang, T. J; Gopalswamy, N (IOP Publishing, 2019-08-10)

We report a solar coronal split-band type II radio burst that was observed on 2016 March 16 with the Gauribidanur Radio Spectro-Polarimeter in the frequency range ≈90–50 MHz, and the Gauribidanur RadioheliograPH at two ...

An Estimate of the Coronal Magnetic Field near a Solar Coronal Mass Ejection from Low-frequency Radio Observations

Hariharan, K; Ramesh, R; Kishore, P; Kathiravan, C; Gopalswamy, N (IOP Publishing, 2014-11-01)

We report ground-based, low-frequency (<100 MHz) radio imaging, spectral, and polarimeter observations of the type II radio burst associated with the solar coronal mass ejection (CME) that occurred on 2013 May 2. The ...

Evolution of Spinning and Braiding Helicity Fluxes in Solar Active Region NOAA 10930

Ravindra, B; Yoshimura, K; Dasso, S (IOP Publishing, 2011-12-10)

The line-of-sight magnetograms from Solar Optical Telescope Narrowband Filter Imager observations of NOAA Active Region 10930 have been used to study the evolution of spinning and braiding helicities over a period of five ...

Formation and eruption of sigmoidal satructure from a weak field region of NOAA 11942

Vasantharaju, N; Vemareddy, P; Ravindra, B; Doddamani, V. H (IOP Publishing, 2019-04-01)

Using observations from the Solar Dynamics Observatory, we studied an interesting example of a sigmoid formation and eruption from small-scale flux-canceling regions of active region (AR) 11942. Through an analysis of ...

High Angular Resolution Radio Observations of a Coronal Mass Ejection Source Region at Low Frequencies during a Solar Eclipse

Ramesh, R; Kathiravan, C; Barve, Indrajit V; Rajalingam, M (IOP Publishing, 2012-01-10)

We carried out radio observations of the solar corona in the frequency range 109-50 MHz during the annular eclipse of 2010 January 15 from the Gauribidanur Observatory, located about 100 km north of Bangalore in India. The ...

Investigation of helicity and energy flux transport in three emerging solar active regions

Vemareddy, P (IOP Publishing, 2015-06-20)

We report the results of an investigation of helicity and energy flux transport from three emerging solar active regions (ARs). Using time sequence vector magnetic field observations obtained from the Helioseismic Magnetic ...

Investigation of two coronal mass ejections from circular ribbon source region:Origin, Sun-Earth propagation and Geoeffectiveness

Syed Ibrahim, M; Uddin, Wahab; Joshi, Bhuwan; Chandra, Ramesh; Awasthi, Arun Kumar (IOP Publishing, 2022-01)

In this article, we compare the properties of two coronal mass ejections (CMEs) that show similar source region characteristics but different evolutionary behaviors in the later phases. We discuss the two events in terms ...

The location of solar metric type ii radio bursts with respect to the associated coronal mass ejections

Ramesh, R; Anna Lakshmi, M; Kathiravan, C; Gopalswamy, N; Umapathy, S (IOP Publishing, 2012-06-20)

Forty-one solar type II radio bursts located close to the solar limb (projected radial distance rlesssim 0.8Rbigdot) were observed at 109 MHz by the radioheliograph at the Gauribidanur observatory near Bangalore during the ...

Low-Frequency Observations of Drifting, Non-Thermal Continuum Radio Emission Associated With the Solar Coronal Mass Ejections

Ramesh, R; Kishore, P; Mulay, S. M; Barve, Indrajit V; Kathiravan, C; Wang, T. J (IOP Publishing, 2013-11-20)

Low-frequency (80 MHz) imaging and spectral (≈85-20 MHz) observations of moving type IV radio bursts associated with coronal mass ejections (CMEs) from the Sun on three different days are reported. The estimated drift speed ...

Nature of helicity injection in non-erupting solar active regions

Vemareddy, P (Oxford University Press on behalf of Royal Astronomical Society, 2022-10)

Using time-sequence vector magnetic field and coronal observations from Solar Dynamics Observatory, we report the observations of the magnetic field evolution and coronal activity in four emerging active regions (ARs). ...

Prominence Eruption Initiated by Helical Kink Instability of an Embedded Flux Rope

Vemareddy, P; Gopalswamy, N; Ravindra, B (IOP Publishing, 2017-11)

We study the triggering mechanism of a limb-prominence eruption and the associated coronal mass ejection ( CME ) near AR 12342 using Solar Dynamics Observatory and Large Angle and Spectrometric Coronagraph / Solar ...

Statistical Study of Magnetic Nonpotential Measures in Confined and Eruptive Flares

Vasantharaju, N; Vemareddy, P; Ravindra, B; Doddamani, V. H (IOP Publishing, 2018-06-10)

Using Solar Dynamics Observatory/Helioseismic and Magnetic Imager vector magnetic field observations, we studied the relation between the degree of magnetic non-potentiality with the observed flare/coronal mass ejection ...

Study of Three-dimensional Magnetic Structure and the Successive Eruptive Nature of Active Region 12371

Vemareddy, P; Demoulin, P (IOP Publishing, 2018-04-20)

We study the magnetic structure of a successively erupting sigmoid in active region 12371 by modeling the quasi-static coronal field evolution with nonlinear force-free field (NLFFF) equilibria. Helioseismic and Magnetic ...

Successive Homologous Coronal Mass Ejections Driven by Shearing and Converging Motions in Solar Active Region NOAA 12371

Vemareddy, P (IOP Publishing, 2017-08)

We study the magnetic field evolution in AR 12371, related to its successive eruptive nature. During the disk transit of seven days, the active region (AR) launched four sequential fast coronal mass ejections (CMEs), ...

Sunspot rotation as a driver of major solar eruptions in the NOAA active region 12158

Vemareddy, P; Cheng, X; Ravindra, B (IOP Publishing, 2016-09-20)

We studied the development conditions of sigmoid structure under the influence of the magnetic non-potential characteristics of a rotating sunspot in the active region (AR) 12158. Vector magnetic field measurements from ...

Browsing by Subject "Sun: coronal mass ejections (CMEs)"

Browsing by Subject "Sun: coronal mass ejections (CMEs)"

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