Contrasts of Faculae in NIR and Visible

Details Contrasts of Faculae in NIR and Visible Contrasts of Faculae in NIR and Visible

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp21a02x&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SP21A-02

Physics

7524 Magnetic Fields, 7529 Photosphere

Scientific paper

We analyzed simultaneous time sequences of images in near infrared and visible light for active region NOAA8518. These images were observed at Big Bear Solar Observatory, CA., in the infrared band at 1.6 mu m and visible band at 0.61 mu m. In addition, we also obtained high resolution magnetograms with our newly developed Digital Magnetograph system. We analyzed these images to study the contrast variation of faculae and the relationship between the facular contrasts and the magnetic fields. Our data show that the contrasts at IR and visible have the same sign, so the dark faculae may not exist--they are just pores. We also investigated the thresholds of magnetic flux density dividing pores and faculae, in both IR and visible.

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