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Browsing by Subject "Magnetic fields"

Browsing by Subject "Magnetic fields"

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  • Analysis of the Forward-scattering Hanle Effect in the Ca I 4227 Å Line 
    Anusha, L. S; Nagendra, K. N; Bianda, M; Stenflo, J. O; Holzreuter, R; Sampoorna, M; Frisch, H; Ramelli, R; Smitha, H. N (IOP Publishing, 2011-08-20)
    Coherent scattering of limb-darkened radiation is responsible for the generation of the linearly polarized spectrum of the Sun (the Second Solar Spectrum). This Second Solar Spectrum is usually observed near the limb of ...
  • Association of calcium network bright points with underneath photospheric magnetic patches 
    Narang, Nancy; Banerjee, D; Chandrashekhar, K; Pant, V (Springer, 2019-04)
    Recent dedicated Hinode polar region campaigns revealed the presence of concentrated kilogauss patches of the magnetic field in the polar regions of the Sun, which are also shown to be correlated with facular bright points ...
  • The Binary History and the Magnetic Field of Neutron Stars 
    Konar, S (Astronomical Society of India, 2003)
    There has been strong observational evidence suggesting a casual connection between the binary history of neutron stars and the evolution of their magnetic field. In this article we discuss one of 3 the plausible mechanisms ...
  • Cosmological magnetic braking and the formation of high-redshift, super-massive black holes 
    Pandey, Kanhaiya L; Sethi, Shiv K; Ratra, Bharat (Oxford University Press on behalf of the Royal Astronomical Society, 2019-06)
    We study the effect of magnetic braking due to a primordial magnetic field in the context of the formation of massive (≳104M⊙) direct-collapse black holes (DCBHs) at high redshifts. Under the assumption of axial symmetry, ...
  • Design and Performance of a Low-Frequency Cross-Polarized Log-Periodic Dipole Antenna 
    Sasikumar Raja, K; Kathiravan, C; Ramesh, R; Rajalingam, M; Barve, Indrajit V (IOP Publishing, 2013-07)
    We report the design and performance of a cross-polarized log-periodic dipole (CLPD) antenna for observations of polarized radio emission from the solar corona at low frequencies. The measured isolation between the two ...
  • Detection of high-frequency oscillations and damping from multi-slit spectroscopic observations of the corona 
    Samanta, T; Singh, J; Sindhuja, G; Banerjee, D (Springer, 2016-01)
    During the total solar eclipse of 11 July 2010, multi-slit spectroscopic observations of the solar corona were performed from Easter Island, Chile. To search for highfrequency waves, observations were taken at a high cadence ...
  • Dynamic responses of sunspots to their ambient magnetic configuration 
    Bagare, S. P (Cambridge University Press, 2011-08)
    In our earlier study of a revisit of the classic Wilson Effect, it was found that a large proportion of sunspots do not display the geometric effect which is ascribed to a depression of the umbra. It was shown that the ...
  • Effect of Cross-redistribution on the Resonance Scattering Polarization of O I Line at 1302 Å 
    Anusha, L. S; Nagendra, K. N; Uitenbroek, H (IOP Publishing, 2014-10-10)
    Oxygen is the most abundant element on the Sun after hydrogen and helium. The intensity spectrum of resonance lines of neutral oxygen, namely, O I (1302, 1305, and 1306 Å), has been studied in the literature for chromospheric ...
  • An efficient decomposition technique to solve angle-dependent Hanle scattering problems 
    Supriya, H. D; Sampoorna, M; Nagendra, K. N; Ravindra, B; Anusha, L. S (Elsevier, 2013-04)
    Hanle scattering is an important diagnostic tool to study weak solar magnetic fields. Partial frequency redistribution (PRD) is necessary to interpret the linear polarization observed in strong resonance lines. Usually ...
  • Evolution of the Sun's activity and the poleward transport of remnant magnetic flux in Cycles 21-24 
    Mordvinov, Alexander V; Karak, Bidya Binay; Banerjee, D; Golubeva, Elena M; Khlystova, Anna I; Zhukova, Anastasiya V.; Kumar, Pawan (Oxford University Press on behalf of Royal Astronomical Society, 2022-02)
    Detailed study of the solar magnetic field is crucial to understand its generation, transport, and reversals. The timing of the reversals may have implications on space weather and thus identification of the temporal ...
  • Faraday rotation signatures of fluctuation dynamos in young galaxies 
    Sur, Sharanya; Pallavi Bhat; Subramanian, K (Oxford University Press on behalf of the Royal Astronomical Society, 2018-03)
    Observations of Faraday rotation through high-redshift galaxies have revealed that they host coherent magnetic fields that are of comparable strengths to those observed in nearby galaxies. These fields could be generated ...
  • Filament Eruption in Association with Rotational Motion Near the Filament Footpoints 
    Dhara, Sajal Kumar; Ravindra, B; Banyal, R. K (Elsevier B.V., 2014-01)
    The active region magnetic field surrounding the filament plays an important role in filament formation, their evolution and disruption. We investigated a filament eruption that occurred in southern hemisphere of the Sun ...
  • First detection of a magnetic field in low-luminosity B[e] stars New scenarios for the nature and evolutionary stages of FS CMa stars 
    Korcakova, D; Sestito, F; Manset, N; Kroupa, P; Votruba, V; Slechta, M; Danford, S; Dvorakova, N; Raj, A; Chojnowski, S. D; Singh, H. P (EDP Sciences, 2022-03)
    We report the first detection of the magnetic field in a star of FS CMa type, a subgroup of objects characterized by the B[e] phenomenon. The split of magnetically sensitive lines in IRAS 17449+2320 determines the magnetic ...
  • Flux emergence in the solar active region NOAA 11158: the evolution of net current 
    Vemareddy, P; Venkatakrishnan, P; Karthikreddy, S (IOP Publishing, 2015-09)
    We present a detailed investigation of the evolution of observed net vertical current using a time series of vector magnetograms of the active region (AR) NOAA 11158 obtained from the Helioseismic and Magnetic Imager. We ...
  • Generalization of the last scattering approximation for the second solar spectrum modeling: the Ca i 4227 å line as a case study 
    Anusha, L. S; Nagendra, K. N; Stenflo, J. O; Bianda, M; Sampoorna, M; Frisch, H; Holzreuter, R; Ramelli, R (IOP Publishing, 2010-08-01)
    To model the second solar spectrum (the linearly polarized spectrum of the Sun that is due to coherent scattering processes), one needs to solve the polarized radiative transfer (RT) equation. For strong resonance lines, ...
  • Grain Alignment in the Circumstellar Shell of IRC+10° 216 
    Andersson, B. -G; Lopez-Rodriguez, Enrique; Medan, Ilija; Archana Soam; Hoang, Thiem; Vaillancourt, John E; Lazarian, Alex; Sandin, Christer; Mattsson, Lars; Tahani, Mehrnoosh (American Astronomical Society, 2022-06-01)
    Dust-induced polarization in the interstellar medium (ISM) is due to asymmetric grains aligned with an external reference direction, usually the magnetic field. For both the leading alignment theories, the alignment of the ...
  • Gravimagnetic field, torsion, and gravitational shielding 
    de Sabbata, V; Sivaram, C (Springer, 1991-08)
    Many arguments are given in support of the existence of a gravimagnetic field in nature. Its connection with torsion is elaborated. Some consequences of the existence of such a field for effects of gravitational shielding ...
  • Hanle Effect with Angle-dependent Partial Frequency Redistribution in Threedimensional Media 
    Anusha, L. S (American Astronomical Society, 2023-06-01)
    There has been a constant improvement in the observational measurement of linear polarization in chromospheric spectral lines in the last three decades. However, modeling polarized profiles of these lines still remains ...
  • Investigation of Rocket Effect in BRC 18 using Gaia EDR3 
    Saha, Piyali; Maheswar, G; Ojha, D. K; Neha, Sharma (Oxford University Press on behalf of Royal Astronomical Society, 2022-02)
    Bright-rimmed clouds (BRCs) are ideal candidates to study radiation-driven implosion mode of star formation as they are potential sites of triggered star formation, located at the edges of HII regions, showing evidence ...
  • The JCMT BISTRO Survey: A Spiral Magnetic Field in a Hub-filament Structure, Monoceros R2 
    Hwang, Jihye; Kim, Jongsoo; Pattle, Kate; Lee, Chang Won; Koch, Patrick M; Johnstone, Doug; Tomisaka, Kohji; Whitworth, Anthony; Furuya, Ray S; Kang, Ji-hyun; Lyo, A-Ran; Duan, Yan; Gu, Qilao; Law, Chi-Yan; Kobayashi, Masato I. N; Li, Dalei; Li, Di; Li, Guangxing; Li, Hua-bai; Liu, Tie; Lu, Xing; Chrysostomou, Antonio; Qian, Lei; Wang, Hongchi; Wu, Jintai; Xie, Jinjin; Nagata, Tetsuya; Yuan, Jinghua; Zhang, Chuan-Peng; Zhang, Guoyin; Zhang, Yapeng; Zhou, Jianjun; Debattista, Victor; Zhu, Lei; Berry, David; Friberg, Per; Graves, Sarah; Liu, Junhao; Nakamura, Fumitaka; Mairs, Steve; Parsons, Harriet; Rawlings, Mark; Doi, Yasuo; Eden, David; Hayashi, Saeko; Hull, Charles L. H; Inoue, Tsuyoshi; Inutsuka, Shu-ichiro; Iwasaki, Kazunari; Kataoka, Akimasa; Nakanishi, Hiroyuki; Pyo, Tae-Soo; Saito, Hiro; Seta, Masumichi; Park, Geumsook; Shimajiri, Yoshito; Chung, Eun Jung; Shinnaga, Hiroko; Tsukamoto, Yusuke; Zenko, Tetsuya; Chen, Huei-Ru Vivien; Duan, Hao-Yuan; Fanciullo, Lapo; Kemper, Francisca; Lee, Chin-Fei; Eyres, Stewart; Lin, Sheng-Jun; Liu, Sheng-Yuan; Arzoumanian, Doris; Ohashi, Nagayoshi; Rao, Ramprasad; Tang, Ya-Wen; Wang, Jia-Wei; Yang, Meng-Zhe; Yen, Hsi-Wei; Bourke, Tyler L; Falle, Sam; Fuller, Gary; Gledhill, Tim; Greaves, Jane; Griffin, Matt; Choi, Minho; Hatchell, Jennifer; Karoly, Janik; Kirk, Jason; Konyves, Vera; Kwon, Woojin; Longmore, Steven; van Loo, Sven; de Looze, Ilse; Peretto, Nicolas; Priestley, Felix; Choi, Youngwoo; Rawlings, Jonathan; Retter, Brendan; Richer, John; Rigby, Andrew; Savini, Giorgio; Kim, Shinyoung; Scaife, Anna; Viti, Serena; Diep, Pham Ngoc; Ngoc, Nguyen Bich; Choi, Yunhee; Tram, Le Ngoc; Andre, Philippe; Coude, Simon; Dowell, C. Darren; Friesen, Rachel; Robitaille, Jean-Francois; Tamura, Motohide; Kwon, Jungmi; Archana, Soam; Han, Ilseung; Jeong, Il-Gyo; Hoang, Thiem; Kim, Kyoung Hee; Onaka, Takashi; Eswaraiah, Chakali; Ward-Thompson, Derek; Liu, Hong-Li; Tang, Xindi; Chen, Wen Ping; Matsumura, Masafumi; Hoang, Thuong Duc; Kang, Miju; Chen, Zhiwei; Le Gouellec, Valentin J. M; Kirchschlager, Florian; Poidevin, Frederick; Bastien, Pierre; Qiu, Keping; Hasegawa, Tetsuo; Lai, Shih-Ping; Byun, Do-Young; Cho, Jungyeon; Kim, Hyosung; Kim, Kee-Tae; Lee, Jeong-Eun; Lee, Sang-Sung; Lee, Yong-Hee; Kawabata, Koji; Lee, Hyeseung; Kim, Mi-Ryang; Yoo, Hyunju; Yun, Hyeong-Sik; Chen, Mike; Di Francesco, James; Fiege, Jason; Fissel, Laura M; Franzmann, Erica; Houde, Martin; Kim, Gwanjeong; Lacaille, Kevin; Matthews, Brenda; Sadavoy, Sarah; Moriarty-Schieven, Gerald; Tahani, Mehrnoosh; Ching, Tao-Chung; Dai, Y. Sophia (American Astronomical Society, 2022-12-10)
    We present and analyze observations of polarized dust emission at 850 μm toward the central 1 × 1 pc hubfilament structure of Monoceros R2 (Mon R2). The data are obtained with SCUBA-2/POL-2 on the James Clerk Maxwell ...

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