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Browsing by Author "Dwivedi, B. N."

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Confined partial filament eruption and its reformation within a stable magnetic flux rope

Joshi, Navin Chandra; Srivastava, Abhishek K.; Filippov, Boris; Kayshap, Pradeep; Uddin, Wahab; Chandra, Ramesh; Choudhary, Debi Prasad; Dwivedi, B. N. (The American Astronomical Society, 2014-04-20)

We present observations of a confined partial eruption of a filament on 2012 August 4, which restores its initial shape within ≈2 hr after eruption. From the Global Oscillation Network Group Hα observations, we find ...
Coronal heating by Alfven waves

Dwivedi, B. N.; Srivastava, A. K. (2010-02-10)

Observations of ultraviolet, X-ray and the wind from the Sun confirmed Bengt Edlen's prediction of a million Kelvin hot solar atmosphere.
Formation of a rotating jet during the filament eruption on 2013 April 10-11

Filippov, B; Srivastava, A. K.; Dwivedi, B. N.; Masson, S.; Aulanier, G.; Joshi, N. C.; Uddin, W. (Wiley, 2015-07)

We analyse multiwavelength and multiviewpoint observations of a helically twisted plasma jet formed during a confined filament eruption on 2013 April 10–11. Given a rather largescale event with its high spatial and ...
Long period slow MHD waves in the solar wind source region

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

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 ...
A multiwavelength study of an M-class flare and the origin of an associated eruption from NOAA AR 11045

Dwivedi, B. N.; Srivastava, A. K.; Kumar, M.; Kumar, P. (2012)

In this paper, we study multiwavelength observations of an M6.4 flare in Active Region NOAA 11045 on 7 February 2010. The space- and ground-based observations from STEREO, SoHO/MDI, EIT, and Nobeyama Radioheliograph were ...
Network loop oscillations with EIS/Hinode

Srivastava, A. K.; Kuridze, D.; Zaqarashvili, T. V.; Dwivedi, B. N.; Rani, B. (2010)

We analyze a time sequence of He II 256.32 Å images obtained with EIS/Hinode, sampling a small magnetic loop in magnetic network. Wavelet analysis indicates 11-min periodicity close to the loop apex. We interpret this ...
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)

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 ∼30 s cadence from 11:34:48 ...
Observation of multiple sausage oscillations in cool post-flare loop

Srivastava, A. K.; Zaqarashvili, T. V.; Uddin, W.; Dwivedi, B. N.; Kumar, P. (2008)

Using simultaneous high spatial (1.3 arcsec) and temporal (5 and 10 s) resolution Hα observations from the 15 cm Solar Tower Telescope at Aryabhatta Research Institute of Observational Sciences (ARIES), we study the ...
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)

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 intensity oscillations in a prominence-like cool loop system as observed by SDO/AIA: evidence of multiple harmonics of fast magnetoacoustic waves

Sivastava, A. K.; Dwivedi, B. N.; Kumar, M. (Springer, 2013)

Using SDO/AIA 304 Å channel, we study the evolution of weak intensity oscillations in a prominence like cool loop system observed at North-West limb on 7 March 2011. We use the standard wavelet tool to produce statistically ...
Signature of slow acoustic oscillations in a non-flaring loop observed by EIS/Hinode

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

We study intensity oscillations near the apex of a coronal loop to find the signature of MHD oscillations. We analyse the time series of the strongest Fe XII 195.12 Å image data, observed by 40" SLOT of the EUV Imaging ...

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