Zobrazeno 1 - 10
of 92
pro vyhledávání: '"Gupta, G. R."'
Publikováno v:
A&A 638, A6 (2020)
We perform multiwavelength time-distance analysis of a fan loop system anchored in an isolated sunspot region AR 12553. The active region was observed by the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory. We measure the phase s
Externí odkaz:
http://arxiv.org/abs/2004.05797
Publikováno v:
A&A 631, A163 (2019)
We present an analysis of several Hinode EIS observations of coronal line widths in the quiet Sun, up to 1.5 Rsun radial distances. No significant variations are found, which indicates no damping of Alfv\'en waves in the quiescent corona. However, th
Externí odkaz:
http://arxiv.org/abs/1905.09783
Publikováno v:
The Astrophysical Journal, Volume 857, Issue 2, article id. 137, 16 pp. (2018)
Using the observations recorded by Atmospheric Imaging Assembly (AIA) on-board the Solar Dynamics Observatory (SDO), the Interface Region Imaging Spectrograph (IRIS) and the Extreme-ultraviolet Imaging Spectrometer (EIS) and X-Ray Telescope (XRT) bot
Externí odkaz:
http://arxiv.org/abs/1803.11172
We report the simultaneous presence of chromospheric umbral flashes and associated umbral waves, and propagating coronal disturbances, in a sunspot and related active region. We have analyzed time-distance maps obtained using the observations from At
Externí odkaz:
http://arxiv.org/abs/1710.08438
Autor:
Ghosh, Avyarthana, Tripathi, Durgesh, Gupta, G. R., Polito, Vanessa, Mason, Helen E., Solanki, Sami K.
A comprehensive study of the physical parameters of active region fan loops is presented using the observations recorded with the Interface Region Imaging Spectrometer (IRIS), the EUV Imaging Spectrometer (EIS) on-board Hinode and the Atmospheric Ima
Externí odkaz:
http://arxiv.org/abs/1701.01617
Autor:
Gupta, G. R.
We investigate off-limb active region and quiet Sun corona using spectroscopic data. Active region is clearly visible in several spectral lines formed in the temperature range of 1.1--2.8 MK. We derive electron number density using line ratio method,
Externí odkaz:
http://arxiv.org/abs/1612.09551
Autor:
Gupta, G. R., Tripathi, Durgesh
Observations of recurrent explosive events (EEs) with time scale of 3-5 minutes are reported. These EEs have been observed with the Interface Region Imaging Spectrograph (IRIS) and have a spatial dimension of $\sim1.5"$ along the slit. The spectral l
Externí odkaz:
http://arxiv.org/abs/1506.05327
Akademický článek
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Publikováno v:
ApJ 800, 140 (2015)
Coronal loops are the basic structures of the solar transition region and corona. The understanding of physical mechanism behind the loop heating, plasma flows, and filling are still considered a major challenge in the solar physics. The mechanism(s)
Externí odkaz:
http://arxiv.org/abs/1412.7428
We present and discuss multi-wavelength observations of five homologous recurrent solar jets that occurred in active region NOAA 11133 on 11 December, 2010. These jets were well observed by the Solar Dynamic observatory (SDO) with high spatial and te
Externí odkaz:
http://arxiv.org/abs/1410.8315