IIA Institutional Repository

Browsing by Author "van Ballegooijen, A. A"

Browsing by Author "van Ballegooijen, A. A"

Sort by: Order: Results:

  • Dynamical evolution of x-ray bright points with hinode/XRT 
    Kariyappa, R; Varghese, B. A; DeLuca, E. E; van Ballegooijen, A. A (Springer, 2010)
    We analyzed a 7-h long time sequence of soft X-ray images obtained on 14 April 2007 from a quiet region using the X-Ray Telescope (XRT) onboard Hinode. The aim was to observe intensity oscillations in coronal XBPs of ...
  • Dynamics of Magnetic Flux Elements in the Solar Photosphere 
    van Ballegooijen, A. A; Nisenson, P; Noyes, R. W; Löfdahl, M. G; Stein, R. F; Nordlund, Å; Krishnakumar, V (The American Astronomical Society, 1998-12)
    The interaction of magnetic fields and convection is investigated in the context of the coronal heating problem. We study the motions of photospheric magnetic elements using a time series of high-resolution G-band and ...
  • Dynamics of the Solar Magnetic Bright Points Derived from Their Horizontal Motions 
    Pradeep Chitta, L; van Ballegooijen, A. A; Rouppe van der Voort, L; DeLuca, E. E; Kariyappa, R (IOP Publishing, 2012-06-10)
    The subarcsecond bright points (BPs) associated with the small-scale magnetic fields in the lower solar atmosphere are advected by the evolution of the photospheric granules. We measure various quantities related to the ...
  • Dynamics of the Solar Magnetic Network. II. Heating the Magnetized Chromosphere 
    Hasan, S. S; van Ballegooijen, A. A (The American Astronomical Society, 2008-06-20)
    We consider recent observations of the chromospheric network and argue that the bright network grains observed in the Ca ii H and K lines are heated by an as-yet-unidentified quasi-steady process. We propose that the heating ...
  • Dynamics of the Solar Magnetic Network: Two-dimensional MHD Simulations 
    Hasan, S. S; van Ballegooijen, A. A; Kalkofen, W; Steiner, O (The American Astronomical Society, 2005-10)
    The aim of this work is to identify the physical processes that occur in the network and contribute to its dynamics and heating. We model the network as consisting of individual flux tubes, each with a nonpotential field ...
  • Excitation of Oscillations in the Magnetic Network on the Sun 
    Hasan, S. S; Kalkofen, W; van Ballegooijen, A. A (The American Astronomical Society, 2000-05)
    We examine the excitation of oscillations in the magnetic network of the Sun through the footpoint motion of photospheric magnetic flux tubes located in intergranular lanes. The motion is derived from a time series of ...
  • Kink and Longitudinal Oscillations in the Magnetic Network on the Sun: Nonlinear Effects and Mode Transformation 
    Hasan, S. S; Kalkofen, W; van Ballegooijen, A. A; Ulmschneider, P (The American Astronomical Society, 2003-03)
    We examine the propagation of kink and longitudinal waves in the solar magnetic network. Previously, we investigated the excitation of network oscillations in vertical magnetic flux tubes through buffeting by granules and ...
  • Nonlinear force-free field modeling of the solar magnetic carpet and comparison with SDO/HMI and Sunrise/IMaX observations 
    Pradeep Chitta, L; Kariyappa, K; van Ballegooijen, A. A; DeLuca, E. E; Solanki, S. K (IOP Publishing, 2014)
    In the quiet solar photosphere, the mixed polarity fields form a magnetic carpet, which continuously evolves due to dynamical interaction between the convective motions and magnetic field. This interplay is a viable source ...
  • Nonlinear Force-free Field Modeling of the Solar Magnetic Carpet and Comparison with SDO/HMI and Sunrise/IMaX Observations 
    Chitta, L. P; Kariyappa, R; van Ballegooijen, A. A; DeLuca, E. E; Solanki, S. K (IOP Publishing, 2014-10-01)
    In the quiet solar photosphere, the mixed polarity fields form a magnetic carpet that continuously evolves due to dynamical interaction between the convective motions and magnetic field. This interplay is a viable source ...
  • Wave propagation in the magnetic network on the Sun 
    Hasan, S. S; Vigeesh, G; van Ballegooijen, A. A (Cambridge University Press, 2006)
    Hasan et al. (2005) have recently presented 2-D dynamical calculations on wave propagation in in the magnetic network of the Sun. The latter is idealized as consisting of non-potential flux tubes in the quiet solar ...
  • Why Does the Sun Have Kilogauss Magnetic Fields? 
    Hasan, S. S; van Ballegooijen, A. A (Astronomical Society of the Pacific, 1998)
    Magnetic fields in the solar photosphere are concentrated in flux tubes with kilogauss field strength surrounded by nearly field-free plasma. Observations show that the flux tubes are located in convective downdrafts where ...

Search DSpace

Browse

My Account