J. Sánchez Almeida 1998 ApJ 497 967 doi:10.1086/305511
Optically Thin Irregularities in the Penumbrae of Sunspots
FREEJ. Sánchez Almeida1
Show affiliationsDifferent estimates of the vertical gradient of magnetic field inclination in penumbrae disagree by 2 orders of magnitude. This disagreement may be resolved if measuring with typical angular resolutions implies averaging hundreds of independent fibrils whose residual variation, upon spatial averaging, gives rise to the observed large-scale structures. The small-scale gradients show up in estimates based on the broadband circular polarization, whereas significant bias affects other methods. From the comparison of these two types of measurements, one can infer the typical sizes of the penumbral irregularities. They turn out to be between 1 and 15 km wide, depending on details of the calculation. This result supports the kind of highly irregular atmosphere that Sánchez Almeida and coworkers proposed to represent the solar magnetic photosphere.
- Subject headings
- Dates
-
Issue 2 (1998 April 20)
Received 1997 July 10, accepted for publication 1997 December 1
-
Optically Thin Irregularities in the Penumbrae of Sunspots
J. Sánchez Almeida 1998 ApJ 497 967
-
Calculation of primitive 6-j symbols
B G Searle and P H Butler 1988 J. Phys. A: Math. Gen. 21 3041
-
Erratum: "Molecular Gas in Spiral Galaxies: A New Warm Phase at Large Galactocentric Distances?" (ApJ, 579, 270 [2002])
P. P. Papadopoulos et al. 2003 ApJ 583 524
-
Quaternionic bound states
Stefano De Leo and Gisele C Ducati 2005 J. Phys. A: Math. Gen. 38 3443
-
Ferroelectric phase transition in hydrogen-bonded 2-aminopyridine phosphate (NC4H4NH2)
H3PO4
Z Czapla et al 2003 J. Phys.: Condens. Matter 15 3793
-
Langevin granulometry of the particle size distribution
Attila Kákay et al 2004 J. Phys. A: Math. Gen. 37 6027
-
Structure of spinel at high temperature using in-situ XANES study at the Al and Mg K-edge
D de Ligny et al 2009 J. Phys.: Conf. Ser. 190 012178
-
Model of periodic filament formation in laterally coupled gas discharges
Rimma Bektursunova 2004 J. Phys. D: Appl. Phys. 37 2868
-
High temperature self-assembly of Ag nanowires on vicinal Si(001)
K R Roos et al 2005 J. Phys.: Condens. Matter 17 S1407
-
Galaxy Mergers at z 1 in the HUDF: Evidence for a Peak in the Major Merger Rate of Massive Galaxies
R. E. Ryan, Jr. et al. 2008 ApJ 678 751