Zobrazeno 1 - 10
of 22
pro vyhledávání: '"Girjesh R. Gupta"'
Coronal loops are basic building blocks of solar atmosphere and are observed on various length scales. However, their formation mechanism is still unclear. In this paper, we present the spectroscopic and imaging observations of small-scale transients
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::425c2bbbcb771762301f74968aef62ff
http://arxiv.org/abs/2203.03529
http://arxiv.org/abs/2203.03529
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:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d970e1d9bf31985a72d28e22ec273699
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:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d5ccbbe9b379b3c90c0b73e060a0c8b0
http://arxiv.org/abs/1803.11172
http://arxiv.org/abs/1803.11172
Autor:
Marco Stangalini, J. G. Doyle, Dmitrii Y. Kolotkov, Abhishek K. Srivastava, Julie Shetye, Girjesh R. Gupta, A. Antonova, Mihalis Mathioudakis, A. Avramova
Publikováno v:
Doyle, J G, Shetye, J, Antonova, A E, Kolotkov, D Y, Srivastava, A K, Stangalini, M, Gupta, G R, Avramova, A & Mathioudakis, M 2018, ' Stellar flare oscillations: evidence for oscillatory reconnection and evolution of MHD modes ', Monthly Notices of the Royal Astronomical Society, vol. 475, no. 2 . https://doi.org/10.1093/mnras/sty032
Here, we report on the detection of a range of quasi-periodic pulsations (20–120 s; QPPs) observed during flaring activity of several magnetically active dMe stars, namely AF Psc, CR Dra, GJ 3685A, Gl 65, SDSS J084425.9+513830, and SDSS J144738.47+
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d57d625d1ba92915ddf8fce5dd026842
https://pure.qub.ac.uk/en/publications/stellar-flare-oscillations-evidence-for-oscillatory-reconnection-and-evolution-of-mhd-modes(8846d10e-b487-4a57-adcb-a34bb78d77d4).html
https://pure.qub.ac.uk/en/publications/stellar-flare-oscillations-evidence-for-oscillatory-reconnection-and-evolution-of-mhd-modes(8846d10e-b487-4a57-adcb-a34bb78d77d4).html
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 446:3741-3748
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:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::64709e94b59daf435c2861af50a203f5
https://doi.org/10.1093/mnras/stu2305
https://doi.org/10.1093/mnras/stu2305
Autor:
Girjesh R. Gupta, Sami K. Solanki, Avyarthana Ghosh, Durgesh Tripathi, Helen E. Mason, Vanessa Polito
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:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::21a300f900d6aea861c94475d45c9ea6
Publikováno v:
Astronomy & Astrophysics. 627:A62
The Alfv\'en wave energy flux in the corona can be explored using the electron density and velocity amplitude of the waves. The velocity amplitude of Alfv\'en waves can be obtained from the non-thermal velocity of the spectral line profiles. Previous
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2b2ae1e244d6d5f3e4e045182743062c
https://doi.org/10.1051/0004-6361/201935357
https://doi.org/10.1051/0004-6361/201935357
Publikováno v:
Solar Physics. 270:213-233
We performed high resolution spectroscopy of the solar corona during the total solar eclipse of 22 July 2009 in two emission lines: the green line at 5303 A due to Fe xiv and the red line at 6374 A due to Fe x, simultaneously from Anji (latitude 30°
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::33782245719689e0798c6880e000b173
https://doi.org/10.1007/s11207-011-9732-7
https://doi.org/10.1007/s11207-011-9732-7
Publikováno v:
Space Science Reviews. 158:267-288
Coronal holes are the coolest and darkest regions of the solar atmosphere, as observed both on the solar disk and above the solar limb. Coronal holes are associated with rapidly expanding open magnetic fields and the acceleration of the high-speed so
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b034b6af600e94c27f047be89fad0c60
https://doi.org/10.1007/s11214-010-9698-z
https://doi.org/10.1007/s11214-010-9698-z
Publikováno v:
The Astrophysical Journal. 850:206
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:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::03eede4fb1db7a46abefbb3354a464cc
https://doi.org/10.3847/1538-4357/aa95c0
https://doi.org/10.3847/1538-4357/aa95c0