Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh31c1806a&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SH31C-1806
Astronomy and Astrophysics
Astrophysics
[7529] Solar Physics, Astrophysics, And Astronomy / Photosphere
Scientific paper
We present results of two-hour uninterrupted observations of solar granulation obtained at excellent seeing conditions on August 3, 2010 with the largest ground-based new solar telescope (NST) operating at Big Bear Solar observatory. Adaptive optics corrected data were acquired with a broad-band TiO filter (centered at a wavelength of 705.7 nm). The time cadence was 10s and the pixel size was 0.0375 arcsec. Photospheric bright points (BPs) were automatically detected and traced. We find that NST TiO BPs are co-spatial with those visible in Hinode/SOT G-band images. In cases where Hinode/SOT detects one large BP, NST shows several fully resolved BPs. Extended filigree features running along intergranular lanes appear in NST images clearly fragmented into separate BPs. The distribution function of the NST BPs size is exponential and extends to the diffraction limit of NST (77 km) without any saturation. The life time distribution function follows a power law with an index of -1.9. About 98.6% of all detected BPs live shorter than 120 s, and the most persistent BP lasted for 44 minutes. The size and the maximum intensity of BPs were found to be proportional to the life time. Results are discussed in framework of coronal heating and turbulent dynamo. Left - Hinode G-band image obtained on 2010 August 3 at 12:22:11 UT (pixel size 0.109"). Right - NST TiO image obtained on 2010 August 3 at 12:22:10 UT. Both images cover the same area of 18.8" x 18.8" on the Sun.
PDFs of the BPs diameter calculated from NST TiO images (black) and from Hinode/SOT G-band images (by Utz et al. 2009, blue).
Abramenko Valentina
Goode Philip. R.
Yurchyshyn Vasyl
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