Two dual-wavelength sequences of high-resolution solar photospheric images captured over several hours and restored by use of phase diversity

¹ Royal Swedish Academy of Sciences, SCFAB, 106 91 Stockholm, Sweden
² Lockheed Martin Solar and Astrophysics Laboratory, B/252, 3251 Hanover Street, Palo Alto, CA 94304, USA
³ ERIM International, PO Box 134008, Ann Arbor, MI 48113-4008, USA

Corresponding author: M. G. Löfdahl, mats@astro.su.se

Received: 6 June 2001
Accepted: 6 August 2001

Abstract

The collection, seeing compensation, and temporal filtering of two high-resolution time-sequences of solar photospheric images are described. image sequences of co-spatial and co-temporal 430.5 nm G band and 436.4 nm continuum filtergrams, were obtained with the 47.5 cm Swedish Vacuum Solar Telescope. One data set covers 5 hours of photospheric evolution; the other covers 8 hours. The field-of-view contains both an enhanced network region, a large pore, and in the longer sequence, a pore forming event. The mean time between frames is <40 s. With a few exceptions, the G band frames are partitioned phase-diverse speckle (PPDS) restorations of three realizations of the atmospheric turbulence acquired rapidly in sequence. Due to strict simultaneity and closely spaced wavelengths, the G band wavefronts, compensated for fixed aberration differences, could also be used for deconvolving the corresponding continuum data. For some of the data, collected during periods of particularly bad seeing, restorations made with a related method, joint phase-diverse speckle, were substituted for the PPDS restorations.