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  • 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 ...
  • Sur, Sharanya; Basu, Aritra; Subramanian, Kandaswamy (Oxford University Press on behalf of the Royal Astronomical Society, 2021-03)
    Using magnetohydrodynamic simulations of fluctuation dynamos, we perform broad-bandwidth synthetic observations to investigate the properties of polarized synchrotron emission and the role that Faraday rotation plays in ...
  • Gaur, H; Gu, M; Ramya, S; Guo, H (EDP Sciences, 2019-11)
    We present a study of a sample of 223 radio-loud quasars (up to redshift < 0.3) in order to investigate their spectral properties. Twenty-six of these radio-loud quasars are identified as flat-spectrum radio quasars (FSRQs), ...
  • Mathur, Harsh; Joshi, Jayant; Nagaraju, K; van der Voort, Luc Rouppe; Bose, Souvik (EDP Sciences, 2022-12)
    Context. Short-lived (100 s or less), sub-arcsec to a couple of arcsec sized features of enhanced brightenings in the narrowband images at the H2V and K2V positions of the Ca ii H&K lines in the quiet Sun are known as ...
  • Steiner, O; Salhab, R; Freytag, B; Rajaguru, S. P; Schaffenberger, W; Steffen, M (Published by Oxford University Press on behalf of the Astronomical Society of Japan, 2014-12)
    The magnetic field outside of sunspots is concentrated in the intergranular space, where it forms a delicate filigree of bright ribbons and dots as seen on broad band images of the Sun. We expect this small-scale magnetic ...
  • Joshi, Jayant; Rouppe van der Voort, Luc H. M (EDP Sciences, 2022-08)
    Context. Magnetic reconnection in the deep solar atmosphere can give rise to enhanced emission in the Balmer hydrogen lines, a phenomenon referred to as Ellerman bombs. Recent high-quality Hβ observations indicate that ...
  • Louis, R. E; Mathew, S. K; Bellot Rubio, L. R; Kiyoshi, I; Ravindra, B; Raja Bayanna, A (IOP Publishing, 2012-06-20)
    High-resolution blue continuum filtergrams from Hinode are employed to study the umbral fine structure of a regular unipolar sunspot. The removal of scattered light from the images increases the rms contrast by a factor ...

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