NDLI: First results on quiet and magnetic granulation from soup

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First results on quiet and magnetic granulation from soup

Content Provider	NASA Technical Reports Server (NTRS)
Author	Ferguson, S. H. Title, A. M. Acton, L. Kelly, G. Finch, M. Lindgren, R. Tarbell, T. D. Duncan, D. Frank, Z. Morrill, M.
Copyright Year	1987
Description	The flight of Solar Optical Universal Polarimeter (SOUP) on Spacelab 2 allowed the collection of time sequences of diffraction limited (0.5 arc sec) granulation images with excellent pointing (0.003 arc sec) and completely free of the distortion that plagues groundbased images. The p-mode oscillations are clearly seen in the data. Using Fourier transforms in the temporal and spatial domain, it was shown that the p-modes dominate the autocorrelation lifetime in magnetic regions. When these oscillations are removed the autocorrelation lifetime is found to be 500 sec in quiet and 950 sec in magnetic regions. In quiet areas exploding granules are seen to be common. It is speculated that a significant fraction of granule lifetimes are terminated by nearby explosions. Using local correlation tracking techniques it was able to measure horizontal displacements, and thus transverse velocities, in the magnetic field. In quiet sun it is possible to detect both super and mesogranulation. Horizontal velocities are as great as 1000 m/s and the average velocity is 400 m/s. In magnetic regions horizontal velocities are much less, about 100 m/s.
File Size	2413013
Page Count	23
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19880002231
Archival Resource Key	ark:/13960/t0ns5nc3r
Language	English
Publisher Date	1987-09-01
Access Restriction	Open
Subject Keyword	Solar Physics Magnetic Flux Fourier Transformation Solar Granulation Solar Atmosphere Polarimetry Sunspots Solar Oscillations Solar Magnetic Field Astronomical Photography 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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