NDLI: Vorticity and divergence in the solar photosphere

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Vorticity and divergence in the solar photosphere

Content Provider	NASA Technical Reports Server (NTRS)
Author	Wang, YI Noyes, Robert W. Tarbell, Theodore D. Title, Alan M.
Copyright Year	1995
Description	We have studied an outstanding sequence of continuum images of the solar granulation from Pic du Midi Observatory. We have calculated the horizontal vector flow field using a correlation tracking algorithm, and from this determined three scalar field: the vertical component of the curl; the horizontal divergence; and the horizontal flow speed. The divergence field has substantially longer coherence time and more power than does the curl field. Statistically, curl is better correlated with regions of negative divergence - that is, the vertical vorticity is higher in downflow regions, suggesting excess vorticity in intergranular lanes. The average value of the divergence is largest (i.e., outflow is largest) where the horizontal speed is large; we associate these regions with exploding granules. A numerical simulation of general convection also shows similar statistical differences between curl and divergence. Some individual small bright points in the granulation pattern show large local vorticities.
File Size	863477
Page Count	9
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19960012483
Archival Resource Key	ark:/13960/t7kq2xr6x
Language	English
Publisher Date	1995-07-01
Access Restriction	Open
Subject Keyword	Solar Physics Magnetohydrodynamics Divergence Solar Convection Astronomy Sun Photosphere Algorithms Solar Granulation Horizontal Distribution Flow Distribution Vorticity Continuums Solar Atmosphere Flow Velocity Scalars Magnetic Field Configurations Solar Radiation Correlation Detection Solar Magnetic Field Tracking Position Solar Observatories Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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