NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Normal incidence X-ray telescope power spectra of X-ray emission from solar active regions. I - Observations. II - TheoryFourier analysis is applied to very high resolution image of coronal active regions obtained by the Normal Incidence X-Ray Telescope is used to find a broad isotropic power-law spectrum of the spatial distribution of soft X-ray intensities. Magnetic structures of all sizes are present down to the resolution limit of the instrument. Power spectra for the X-ray intensities of a sample of topologically different active regions are found which fall off with increasing wavenumber as 1/k-cubed. A model is presented that relates the basic features of coronal magnetic fluctuations to the subphotospheric hydrodynamic turbulence that generates them. The model is used to find a theoretical power spectrum for the X-ray intensity which falls off with increasing wavenumber as 1/k-cubed. The implications of a turbulent regime in active regions are discussed.
Document ID
19930046737
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Gomez, Daniel O.
(Hawaii Univ. Honolulu, United States)
Martens, Petrus C. H.
(Lockheed Research Labs. Palo Alto, CA, United States)
Golub, Leon
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Date Acquired
August 16, 2013
Publication Date
March 10, 1993
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 405
Issue: 2
ISSN: 0004-637X
Subject Category
Solar Physics
Accession Number
93A30734
Funding Number(s)
CONTRACT_GRANT: NAS8-37334
CONTRACT_GRANT: NAGW-112
CONTRACT_GRANT: NSF ATM-91-06052
CONTRACT_GRANT: NAGW-864
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available