Zobrazeno 1 - 10
of 186
pro vyhledávání: '"Fisher, G. H."'
Autor:
Rempel, M., Fan, Y., Dikpati, M., Malanushenko, A., Kazachenko, M. D., Cheung, M. C. M., Chintzoglou, G., Sun, X., Fisher, G. H., Chen, T. Y.
Modeling of transient events in the solar atmosphere requires the confluence of 3 critical elements: (1) model sophistication, (2) data availability, and (3) data assimilation. This white paper describes required advances that will enable statistical
Externí odkaz:
http://arxiv.org/abs/2212.14384
Publikováno v:
Solar Physics, 294, 84 (2019)
In this work we study how the input data cadence affects the photospheric energy and helicity injection estimates in eruptive NOAA active region 11158. We sample the novel 2.25-minute vector magnetogram and Dopplergram data from the \emph{Helioseismi
Externí odkaz:
http://arxiv.org/abs/1907.00367
Autor:
Lynch, B. J., Masson, S., Li, Y., DeVore, C. R., Luhmann, J. G., Antiochos, S. K., Fisher, G. H.
Publikováno v:
J. Geophys. Res. Space Physics, 121, 10677-10697, 2016
Stealth coronal mass ejections (CMEs) are events in which there are almost no observable signatures of the CME eruption in the low corona but often a well-resolved slow flux rope CME observed in the coronagraph data. We present results from a three-d
Externí odkaz:
http://arxiv.org/abs/1612.08323
Publikováno v:
Astrophys.J.715:242-259,2010
Determining the electric field (E-field) distribution on the Sun's photosphere is essential for quantitative studies of how energy flows from the Sun's photosphere, through the corona, and into the heliosphere. This E-field also provides valuable inp
Externí odkaz:
http://arxiv.org/abs/0912.4916
Publikováno v:
Astrophys.J.705:821-843,2009
We estimated photospheric velocities by separately applying the Fourier Local Correlation Tracking (FLCT) and Differential Affine Velocity Estimator (DAVE) methods to 2708 co-registered pairs of SOHO/MDI magnetograms, with nominal 96-minute cadence a
Externí odkaz:
http://arxiv.org/abs/0905.0529
Autor:
Fisher, G. H., Welsch, B. T.
We describe the computational techniques employed in the recently updated Fourier local correlation tracking (FLCT) method. The FLCT code is then evaluated using a series of simple, 2D, known flow patterns that test its accuracy and characterize its
Externí odkaz:
http://arxiv.org/abs/0712.4289
Autor:
Welsch, B. T., Fisher, G. H.
Estimates of velocities from time series of photospheric and/or chromospheric vector magnetograms can be used to determine fluxes of magnetic energy (the Poynting flux) and helicity across the magnetogram layer, and to provide time-dependent boundary
Externí odkaz:
http://arxiv.org/abs/0710.0546
Publikováno v:
Astrophys.J. 631 (2005) 529-539
The objective of this paper is to investigate whether a convective dynamo can account quantitatively for the observed lower limit of X-ray surface flux in solar-type main sequence stars. Our approach is to use 3D numerical simulations of a turbulent
Externí odkaz:
http://arxiv.org/abs/astro-ph/0506027
The Effects of Rotation on the Evolution of Rising Omega-loops in a Stratified Model Convection Zone
Publikováno v:
ApJ Vol 546, No. 2, p 1194
We present three-dimensional MHD simulations of buoyant magnetic flux tubes that rise through a stratified model convection zone in the presence of solar rotation. The equations of MHD are solved in the anelastic approximation, and the results are us
Externí odkaz:
http://arxiv.org/abs/astro-ph/0008501
Publikováno v:
ApJ 540:548-562, 2000 Sept. 1
We present three-dimensional numerical simulations of the rise and fragmentation of twisted, initially horizontal magnetic flux tubes which evolve into emerging Omega-loops. The flux tubes rise buoyantly through an adiabatically stratified plasma tha
Externí odkaz:
http://arxiv.org/abs/astro-ph/0004031