Browsing by Author "Karak, B.B."

Browsing by Author "Karak, B.B."

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  • Chaotic transients and hysteresis in an α2 dynamo model 
    Oliveira, D.N.; Rempel, E.L.; Chertovskih, R.; Karak, B.B. (Web Portal IOP, 2021-06)
    The presence of chaotic transients in a nonlinear dynamo is investigated through numerical simulations of the 3D magnetohydrodynamic equations. By using the kinetic helicity of the flow as a control parameter, a hysteretic ...
  • Double Peaks of the Solar Cycle: An Explanation from a Dynamo Model 
    Karak, B.B.; Mandal, S.; Banerjee, D. (Institute of Physics 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 ...
  • Exploring the Cycle Period and Parity of Stellar Magnetic Activity with Dynamo Modeling 
    Hazra, G.; Jiang, J.; Karak, B.B.; Kitchatinov, L. (Institute of Physics Publishing, 2019-10-10)
    Observations of chromospheric and coronal emissions from various solar-type stars show that the stellar magnetic activity varies with the rotation rates of the stars. The faster the star rotates, the stronger its magnetic ...
  • 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, Dipankar; 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.; Mazumder, Rakesh; Rao, Yamini K.; Yadav, Rahul (Frontiers Media S.A., 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 ...
  • Global maps of the magnetic field in the solar corona 
    Yang, Z.; Bethge, C.; Tian, H.; Tomczyk, S.; Morton, R.; Del Zanna, G.; Del Zanna, S.W.; Karak, B.B.; Gibson, S.; Samanta, T.; He, J.; Chen, Y.; Wang, L. (American Association for the Advancement of Science, 2020-08-07)
    Understanding many physical processes in the solar atmosphere requires determination of the magnetic field in each atmospheric layer. However, direct measurements of the magnetic field in the Sun's corona are difficult to ...
  • Recovery from Maunder-like Grand Minima in a Babcock-Leighton Solar Dynamo Model 
    Karak, B.B.; Miesch, M. (Institute of Physics Publishing, 2018-06-20)
    The Sun occasionally goes through Maunder-like extended grand minima when its magnetic activity drops considerably from the normal activity level for several decades. Many possible theories have been proposed to explain ...
  • Waldmeier Effect in Stellar Cycles 
    Garg, S.; Karak, B.B.; Egeland, R.; Soon, W.; Baliunas, S. (Institute of Physics Publishing, 2019-12-01)
    One of the most robust features of the solar magnetic cycle is that the stronger cycles rise faster than the weaker ones. This is popularly known as the Waldmeier Effect, which has been known for more than 100 yr. This ...