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Browsing by Subject "sunspots"

Browsing by Subject "sunspots"

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  • Applying the weighted horizontal magnetic gradient method to a simulated flaring active region 
    Korsos, M. B; Chatterjee, Piyali; Erdelyi, R (IOP Publishing, 2018-04-20)
    Here, we test the weighted horizontal magnetic gradient (WGM) as a flare precursor, introduced by Korsós et al., by applying it to a magnetohydrodynamic (MHD) simulation of solar-like flares. The preflare evolution of the ...
  • Double Peaks of the Solar Cycle: An Explanation from a Dynamo Model 
    Karak, B. B; Mandal, Sudip; Banerjee, D (IOP Publishing, 2018-10-10)
    One peculiar feature of the solar cycle that is yet to be understood properly is the frequent occurrence of double peaks (also known as the Gnevyshev peaks). The double peaks, and also multiple peaks and spikes, are often ...
  • The extended solar cycle: muddying the waters of solar/stellar dynamo modeling or providing crucial observational constraints? 
    Srivastava, Abhishek K; McIntosh, Scott W; Arge, N; Banerjee, D; Dikpati, Mausumi; Dwivedi, Bhola N; Guhathakurta, Madhulika; Karak, B. B; Leamon, Robert J; Matthew, Shibu K; Munoz-Jaramillo, Andres; Nandy, D; Norton, Aimee; Upton, L; Chatterjee, S; Rakesh, M; Yamini K. Rao; Rahul Yadav (Frontiers, 2018-11-22)
    "In 1844 Schwabe discovered that the number of sunspots increased and decreased over a period of about 11 years, that variation became known as the sunspot cycle. Almost eighty years later, Hale described the nature of the ...
  • Long-term variability of the solar cycle in the Babcock-Leighton dynamo framework 
    Karak, B. B; Miesch, Mark (Cambridge University Press, 2018-02)
    We explore the cause of the solar cycle variabilities using a novel 3D Babcock– Leighton dynamo model. In this model, based on the toroidal flux at the base of the convection zone, bipolar magnetic regions (BMRs) are ...
  • Observations of oppositely directed umbral wavefronts rotating in sunspots obtained from the New Solar Telescope of BBSO 
    Su, J. T; Ji, K. F; Cao, W; Banerjee, D; Priya, T. G; Zhao, J. S; Bai, X. Y; Chen, J; Zhang, M; Ji, H. S (IOP Publishing, 2016-02)
    We study the umbral waves as observed by chromospheric imaging observations of two sunspots with the New Solar Telescope at the Big Bear Solar Observatory. We find that the wavefronts (WFs) rotate clockwise and form ...
  • Phase difference between the two components of the solar cycle 
    Gokhale, M. H; Sivaraman, K. R (Astronomical Society of India, 1982-06)
    It is confirmed that near each solar minimum the latitude zone over which the small sunspot groups are distributed expands a few years before the expansion of the latitude zone of the large spot groups takes place. It is ...
  • Signatures of the Impact of Flare-Ejected Plasma on the Photosphere of a Sunspot Light Bridge 
    Felipe, T; Collados, M; Khomenko, E; Rajaguru, S. P; Franz, M; Kuckein, C; Asensio Ramos, A (EDP Sciences, 2017-12)
    Aims. We investigate the properties of a sunspot light bridge, focusing on the changes produced by the impact of a plasma blob ejected from a C-class flare. Methods. We observed a sunspot in active region NOAA 12544 ...
  • Sunspot area catalog revisited: Daily cross-calibrated areas since 1874 
    Mandal, Sudip; Krivova, N. A; Solanki, S. K; Sinha, N; Banerjee, D (EDP Sciences, 2020-08)
    Context. Long and consistent sunspot area records are important for understanding long-term solar activity and variability. Multiple observatories around the globe have regularly recorded sunspot areas, but such individual ...
  • Temporal variations of the solar EUV network properties 
    Varghese, B.S; Raju, K. P; Kurian, P. J (Indian Academy of Sciences, 2019-07-11)
    The chromospheric network extended to the transition region as the solar EUV network disperses at the coronal level. The EUV emission lines from the transition region give information about different atmospheric heights. ...

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