Browsing by Title

Sort by: Order: Results:

  • Mandal, Sudip; Samanta, T; Banerjee, D; Krishna Prasad, S; Teriaca, L (IOP Publishing, 2015-11)
    Propagating disturbances are often observed in active region fan-like coronal loops. They were thought to be due to slow mode magnetohydrodynamic waves based on some of the observed properties. However, recent studies ...
  • Samanta, T; Pant, V; Banerjee, D (IOP Publishing, 2015-12-10)
    Spicules are small, hairy-like structures seen at the solar limb, mainly at chromospheric and transition region lines. They generally live for 3–10 minutes. We study these spicules in a south polar region of the Sun with ...
  • Krishna Prasad, S; Banerjee, D; Gupta, G. R (EDP Sciences, 2011-04)
    Context. Polar corona is often explored to find the energy source for the acceleration of the fast solar wind. Earlier observations show omni-presence of quasi-periodic disturbances, traveling outward, which is believed ...
  • Banerjee, D; Teriaca, L; Gupta, G. R (Springer, 2011-07)
    Coronal holes are the coolest and darkest regions of the upper 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 ...
  • Banerjee, D; Teriaca, L; Gupta, G. R; Imada, S; Stenborg, G; Solanki, S. K (EDP Sciences, 2009-06)
    Context: To study the dynamics of coronal holes and the role of waves in the acceleration of the solar wind, spectral observations were performed over polar coronal hole regions with the SUMER spectrometer on SoHO and the ...
  • Osborne, J. L (Astronomical Society of India, 1977-03)
  • Sivaram, C (International Astronomical Union, 1990)
    The VVO mechanism suggests that the existence of a neutrino magnetic moment would lead to variations of the observed solar neutrino flux with the magnetic activity of the sun. The MSW mechanism suggests neutrino oscillations ...
  • Gangadhara, R. T; Lesch, H; Krishan, V (The Royal Astronomical Society, 1999-08)
    We consider the role of a propagation effect such as stimulated Raman scattering on the polarization of radio pulses. When an intense electromagnetic wave with frequency close to the plasma frequency interacts with the ...
  • Grant, S. D. T; Jess, D. B; Stangalini, M; Jafarzadeh, S; Fedun, V; Verth, G; Keys, P. H; Rajaguru, S. P; Uitenbroek, H; MacBride, C. D; Bate, W; Gilchrist-Millar, C. A (American Astronomical Society, 2022-10-20)
    Solar pores are efficient magnetic conduits for propagating magnetohydrodynamic wave energy into the outer regions of the solar atmosphere. Pore observations often contain isolated and/or unconnected structures, preventing ...
  • Mishra, Wageesh; Teriaca, Luca (Indian Academy of Sciences, 2023-06)
    Coronal mass ejections (CMEs), as they can inject a large amounts of mass and magnetic flux into the interplanetary space, are the primary source of space weather phenomena on the Earth. The present review first briefly ...
  • Zhukov, V. I; Efremov, V. I (Astronomical Society of Indian, 1988-12)
    Numerical calculations are given for the propagation of Alfven p-waves in the solar atmosphere for Geronicolas' (1977) sunspot model. It is shown that Alfven p-waves with a period greater than 400s do not, in fact, penetrate ...
  • Shelke, R. N; Pande, M. C (Astronomical Society of India, 1985-03)
    We present an analysis which indicates that in several cases coronal holes exist in the vicinity of the active regions producing type II bursts. It is inferred that shock waves which produce type II bursts essentially ...
  • Pocock, R. J (Astronomical Society of India, 1915)
  • Narang, Mayank; Manoj, P; Furlan, E; Mordasini, C; Henning, Thomas; Mathew, Blesson; Banyal, R. K; Sivarani, T (IOP Publishing, 2018-11)
    Correlations between the occurrence rate of exoplanets and their host star properties provide important clues about the planet formation process. We studied the dependence of the observed properties of exoplanets (radius, ...
  • Sahu, D. K; Pandey, S. K; Kembhavi, A. K (Astronomical Society of India, 1999)
    Early-type galaxies with large-scale dust are suitable objects to investigate the propeties of dust extinction in extragalactic environments because the underlying galaxies have fairly smooth distribution of the starlight. ...
  • Patil, M. K; Pandey, S. K; Sahu, D. K; Kembhavi, A (EDP Sciences, 2007-01)
    We report optical extinction properties of dust for a sample of 26 early-type galaxies based on the analysis of their multicolour CCD observations. The wavelength dependence of dust extinction for these galaxies is determined ...
  • Rajaguru, S. P; Couvidat, S; Sun, Xudong; Hayashi, K; Schunker, H (Springer, 2013-10)
    We study properties of waves of frequencies above the photospheric acoustic cut-off of ≈5.3 mHz, around four active regions, through spatial maps of their power estimated using data from the Helioseismic and Magnetic Imager ...
  • Rakshit, S; Stalin, C. S; Chand, H; Zhang, X (Bulletin de la Societe Royale des Sciences de Liege, 2018-04)
    Narrow line Seyfert 1 (NLSy1) galaxies constitute a class of active galactic nuclei characterized by the full width at half maximum (FWHM) of the Hα broad emission line <2000 km s-1 and the flux ratio of [O III] to Hα ...
  • Maeda, K; Nozawa, T; Sahu, D. K; Minowa, Y; Motohara, K; Ueno, I; Folatelli, G; Pyo, T. S; Kitagawa, Y; Kawabata, K. S; Anupama, G. C; Kozasa, T; Moriya, T. J; Yamanaka, M; Nomoto, K; Bersten, M; Quimby, R; Iye, M (IOP Publishing, 2013-10-10)
    Supernovae (SNe) have been proposed to be the main production sites of dust grains in the universe. However, our knowledge of their importance to dust production is limited by observationally poor constraints on the nature ...

Search DSpace

Browse

My Account