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Browsing by Author "Dwivedi, B.N."

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Discovery of the Sun's million-degree hot corona

Peter, H.; Dwivedi, B.N. (Frontiers Media S.A., 2014-07-30)

As time goes by, discoveries become common knowledge, and often the person who first changed a paradigm gets forgotten. One such case is the discovery that the Sun's corona is a million degrees hot—much hotter than its ...
Gravitational redshift and the vacuum index of refraction

Wilhelm, K.; Dwivedi, B.N. (Springer Netherlands, 2019-02-01)

A physical process of the gravitational redshift was described in an earlier paper (Wilhelm and Dwivedi, New Astron. 31:8, 2014). This process did not require any information for the emitting atom neither on the local ...
Long period slow MHD waves in the solar wind source region

Dwivedi, B.N.; Srivastava, A.K. (2008-11)

We consider compressive viscosity and thermal conductivity to study the propagation and dissipation of long period slow longitudinal MHD waves in polar coronal holes. We discuss their likely role in the line profile ...
Observation of intensity oscillations above X-ray bright points from the Hinode/XRT: Signature of magnetohydrodynamic oscillations in the solar corona

Kumar, M.; Srivastava, A.K.; Dwivedi, B.N. (2011-08)

We analyse the temporal image data of the quiet Sun observed by the X-ray Telescope (XRT) onboard the Hinode spacecraft and Al-poly filter on 2007 March 31. We choose these temporal image data of ~30s cadence from 11:34:48 ...
Observations from Hinode/EIS of intensity oscillations above a bright point: signature of the leakage of acoustic oscillations in the inner corona

Srivastava, A.K.; Dwivedi, B.N. (2010-07)

We study the intensity oscillations in the upper chromosphere/transition region (TR) and corona, above a bright point (BP) in the solar atmosphere. We analyse the time series of He ii 256 Å, Fe xii 195 Å and Fe xv 284 Å, ...
Observations of the sun at vacuum-ultraviolet wavelengths from space. Part II: Results and interpretations

Wilhelm, K.; Marsch, E.; Dwivedi, B.N.; Feldman, U. (2007-12)

In Part I of this review, the concepts of solar vacuum-ultraviolet (VUV) observations were outlined together with a discussion of the space instrumentation used for the investigations. A section on spectroradiometry provided ...
Plasma Flows in the Cool Loop Systems

Rao, Y.K.; Srivastava, A.K.; Kashyap, P.; Wilhelm, K.; Dwivedi, B.N. (Institute of Physics Publishing, 2019-03-20)

We study the dynamics of low-lying cool loop systems for three data sets as observed by the Interface Region Imaging Spectrograph. Radiances, Doppler shifts, and line widths are investigated in and around observed cool ...
Rotating network jets in the quiet Sun as observed by IRIS

Kayshap, P; Murawski, K.; Srivastava, A.K.; Dwivedi, B.N. (EDP Sciences, 2018)

Aims. We perform a detailed observational analysis of network jets to understand their kinematics, rotational motion, and underlying triggering mechanism(s). We analyzed the quiet-Sun (QS) data. Methods. IRIS high-resolution ...
Spatial damping of compressional MHD waves in prominences

Singh, K.A.P.; Dwivedi, B.N.; Hasan, S.S. (2007-10)

Aims. We study the spatial damping of linear compressional MHD waves in a homogeneous, isothermal, and unbounded prominence. Methods. We derive a general dispersion relation invoking the Newtonian radiation and turbulent ...
Twin CME Launched by a Blowout Jet Originated from the Eruption of a Quiet-Sun Mini-filament

Solanki, R.; Srivastava, A.K.; Rao, Y.K.; Dwivedi, B.N. (Springer Netherlands, 2019-06-01)

We study a quiet-Sun blowout jet which was observed on 2014 May 16 by the instruments on board the Solar Dynamics Observatory (SDO). We find the twin CME as jet-like and bubble-like CMEs simultaneously as observed by LASCO ...
Two-fluid Numerical Simulations of Solar Spicules

Kuźma, B.; Murawski, K.; Kayshap, P.; Wójcik, D.; Srivastava, A.K.; Dwivedi, B.N. (Institute of Physics Publishing, 2017-11-10)

We aim to study the formation and evolution of solar spicules by means of numerical simulations of the solar atmosphere. With the use of newly developed JOANNA code, we numerically solve two-fluid (for ions + electrons and ...

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