Phase-diversity restored, two-wavelength photospheric image sequences

This image is one of the best from the 11 June G-band sequence (frame 342, collected at 14:31 UT). Tick marks are 1 arc second apart.

The image sequences are from 11 and 12 June 1997.



Data from 11 June 1997

A 5-hour (516 frames) time series of co-spatial and co-temporal 430.5 nm G-band and 436.4 nm continuum filtergrams, obtained on 11 June 1997 with the 50 cm Swedish Vacuum Solar Telescope on the island of La Palma, Spain.

The 44×80 arc second field-of-view (FOV) includes the large pore AR8050 at N28 E25. The mean time between frames is 36 s. Each frame is a Phase-Diverse Speckle (PDS; see Löfdahl & Scharmer 1994; Paxman et al. 1996) restoration of three realizations of the atmospheric turbulence acquired rapidly in sequence. The result is high-resolution movies of the solar photosphere. The process of wavefront sensing and restoration of the data is described by Löfdahl et al. (2001).


Data from 12 June 1997

A similar, 8-hour (709 frames) sequence from 12 June 1997. (Not yet available.)



The image frames are not destretched or space-time filtered.

Gzipped tar archives with data files in ANA format for download and analysis:

11 June 1997 G-band, 933 MBytes (1.11 GBytes decompressed).
11 June 1997 Continuum, 875 MBytes (1.04 GBytes decompressed).
12 June 1997 G-band, XXX MBytes (not yet available).
12 June 1997 Continuum, XXX MBytes (not yet available).

ANA files can be read into IDL.

As with all data collected with the SVST, any paper that is based on these data should include the following sentence in the Acknowledgements section:

The Swedish Vacuum Solar Telescope is operated on the island of La Palma by the Royal Swedish Academy of Sciences in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.


Relevant papers

M.G. Löfdahl, T.E. Berger & J.H Seldin (2001), Two dual-wavelength sequences of high resolution solar photospheric images captured over several hours and restored by use of Phase Diversity, Astronomy & Astrophysics, 377, pp. 1128

T.E. Berger, M.G. Löfdahl, & D.J. Bercik (2002), Observation and modelling of micropore formation in active network regions, Bulletin of the American Astronomical Society, 200, #91.01

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