Observations of magnetoconvection in Sunspots with 100 km resolution

Details Observations of magnetoconvection in Sunspots with 100 km resolution Observations of magnetoconvection in Sunspots with 100 km resolution

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spd....34.1108b&link_type=abstract

American Astronomical Society, SPD meeting #34, #11.08; Bulletin of the American Astronomical Society, Vol. 35, p.828

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present new observations from the Swedish 1-meter Solar Telescope (SST) on La Palma with ˜0.1 arcsecond ( ˜100 km) resolution: the highest resolution yet achieved in solar observations. We focus on sunspot and active region magnetoconvective phenomena using G-band 4305 Å, 4877 Å continuum, 7507 Å TiO bandhead, and Ca II 3968 Å H-line filtergram movies. The G-band data are post-processed using Joint Phase Diverse Speckle wavefront restoration to create a full diffraction limited time series. Sunspot light-bridges are shown to have dark lanes less than 300 km in width that are coherent along the entire length of the bridge. Similarly, we find elongated dark ``canals'' in plage regions, particularly near pores, that appear to be highly modified intergranular downflow lanes. The canals are less than 200 km in width and are much more coherent than intergranular lanes in non-magnetic regions, often retaining their basic structure for more than one granular turn-over time. Both the light-bridge central lane and the canals appear to be the result of highly constrained flow structure in strong magnetic field regions -- an aspect of solar magnetoconvection that has not previously been observed. This reseach was supported by funding from the Royal Swedish Academy of Sciences, a SOHO Guest Investigator subcontract to California State University Northridge, and the NASA TRACE contract NAS5-38099 at Lockheed Martin.

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