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Browsing IIAP Publications by Author "Anshu Kumari"

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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 ...
The First Low-frequency Radio Observations of the Solar Corona on ≈200 km Long Interferometer Baseline

Mugundhan, V; Ramesh, R; Kathiravan, C; Gireesh, G. V. S; Anshu Kumari; Hariharan, K; Barve, Indrajit V (IOP Publishing, 2018-03-01)

The angular size of the smallest, compact radio source that can be observed in the solar atmosphere is one of the intriguing questions in low-frequency radio astronomy. This is important to understand density turbulence ...
Imaging and spectral observations of a type-II radio burst revealing the section of the CME-Driven shock that accelerates electrons

Majumdar, Satabdwa; Tadepalli, Srikar Paavan; Maity, Samriddhi Sankar; Deshpande, Ketaki; Anshu Kumari; Ritesh Patel; Gopalswamy, Nat (Springer, 2021-04)

We report on a multi-wavelength analysis of the 26 January 2014 solar eruption involving a coronal mass ejection (CME) and a Type-II radio burst, performed by combining data from various space and ground-based instruments. ...
Low-frequency radio observations of the “quiet” corona during the descending phase of sunspot cycle 24

Ramesh, R; Anshu Kumari; Kathiravan, C; Ketaki, D; Rajesh, M; Vrunda, M (The American Geophysical Union, 2020-09-28)

We carried out a statistical study of the “quiet” solar corona during the descending phase of the Sunspot Cycle 24 (i.e., January 2015 to May 2019) using data obtained with the Gauribidanur RAdioheliograPH (GRAPH) at 53 ...
New Evidence for a Coronal Mass Ejection-driven High Frequency Type II Burst near the Sun

Anshu Kumari; Ramesh, R; Kathiravan, C; Gopalswamy, N (IOP Publishing, 2017-07)

We report observations of the high frequency type II radio burst (≈430–30 MHz) that occurred in the solar corona on 2015 November 4. The drift rate of the burst, estimated close to the start frequency of its fundamental ...
New results on the direct observations of thermal radio emission from a solar coronal mass ejection

Ramesh, R; Anshu Kumari; Kathiravan, C; Ketaki, D; Wang, T. J (American Geophysical Union, 2021-04-28)

We report observations of thermal emission from the frontal structure of a coronal mass ejection (CME) using data obtained with the Gauribidanur RAdioheliograPH simultaneously at 80 and 53 MHz on May 1, 2016. The CME was ...
On the usefulness of existing solar wind models for pulsar timing corrections

Tiburzi, C; Verbiest, J. P. W; Shaifullah, G. M; Janssen, G. H; Anderson, J. M; Horneffer, A; Kunsemoller, J; Ostowski, S; Donner, J. Y; Kramer, M; Anshu Kumari; Porayko, N. K; Zucca, P; Ciardi, B; Dettmar, R.J; Griebmeier, J.M; Hoeft, M; Serylak, M (Oxford University Press on behalf of the Royal Astronomical Society, 2019-07)

Dispersive delays due to the solar wind introduce excess noise in high-precision pulsar timing experiments, and must be removed in order to achieve the accuracy needed to detect, e.g., low-frequency gravitational waves. ...
Solar Coronal Density Turbulence and Magnetic Field Strength at the Source Regions of Two Successive Metric Type II Radio Bursts

Ramesh, R; Kathiravan, C; Anshu Kumari (American Astronomical Society, 2023-01-20)

We report spectral and polarimeter observations of two weak, low-frequency (≈85–60 MHz) solar coronal type II radio bursts that occurred on 2020 May 29 within a time interval ≈2 minutes. The bursts had fine structures, ...
Strength of the Solar Coronal Magnetic Field A Comparison of Independent Estimates Using Contemporaneous Radio and White-Light Observations

Anshu Kumari; Ramesh, R; Kathiravan, C; Wang, T. J (Springer, 2017-11)

Abstract We estimated the coronal magnetic field strength (B) during the 23 July 2016 coronal mass ejection (CME) event using i) the flux rope structure of the CME in the whitelight coronagraph images and ii) the ...

Browsing IIAP Publications by Author "Anshu Kumari"

Browsing IIAP Publications by Author "Anshu Kumari"

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