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Titolo:
The size of penumbral fine structure
Autore:
Sutterlin, P;
Indirizzi:
Sterrenkundig Inst Utrecht, NL-3507 TA Utrecht, Netherlands Sterrenkundig Inst Utrecht Utrecht Netherlands NL-3507 TA t, Netherlands
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 3, volume: 374, anno: 2001,
pagine: L21 - L24
SICI:
1432-0746(200108)374:3<L21:TSOPFS>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
TO-LIMB VARIATION; SOLAR GRANULATION; ATMOSPHERIC-TURBULENCE; IMAGE-RECONSTRUCTION; SPECKLE-MASKING; SUNSPOTS;
Keywords:
Sun : magnetic fields; sunspots;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Sutterlin, P Sterrenkundig Inst Utrecht, Postbus 80 000, NL-3507 TA Utrecht, Netherlands Sterrenkundig Inst Utrecht Postbus 80 000 Utrecht Netherlands NL-3507 TA
Citazione:
P. Sutterlin, "The size of penumbral fine structure", ASTRON ASTR, 374(3), 2001, pp. L21-L24

Abstract

I present power spectra of penumbral and granular intensity variations from a speckle-restored G-band image sequence of sunspot NOAA 9407 taken on April 1, 2001 with the Dutch Open Telescope on La Palma. I compare spatial power spectra of the sunspot penumbra with spatial power spectra from granulation with and without filigree. Relative to the granular power distribution, the penumbral power spectrum is enhanced over a wide range in spatial frequency peaking at 0."35. For smaller scales, the penumbral power distribution closely resembles that of the granular intensity variations. In contrast, the power spectrum of granulation with filigree exhibits increased power down to the resolution limit of 0."22, indicating the presence of unresolved magnetic elements.

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Documento generato il 25/01/20 alle ore 06:49:19