A Study of AR 9144; A Fast-Growing EFR |
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| Authors: | GA Chapman |
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| Institution: | (1) San Fernando Observatory, Department of Physics and Astronomy, California State University, Northridge, Northridge, CA, 91330 |
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| Abstract: | This paper is a study of NOAA region 9144, an emerging flux region (EFR) which grew rapidly beginning 25 August 2000. This
region was visible in SOHO data at 0 UT on 25 August 2000 as a small, isolated spot. It was recognizable as an active region
with multiple spots by 06:00 UT on the 25th and was a fully developed AR by 24h UT on the 26th of August. Data are presented from the Michelson Doppler Imager (MDI) experiment on the Solar and Heliospheric
Observatory satellite (SOHO), from Big Bear Solar Observatory (BBSO) and from the San Fernando Observatory (SFO). The MDI
data are Dopplergrams, magnetograms, and continuum images. The BBSO data are high-resolution Hα filtergrams. The SFO data
are Dopplergrams, magnetograms and continuum images from the Video SpectraSpectroHeliograph (VSSHG). MDI Doppler images show
that during the rapid growth of this EFR during the day of 26 August, the most obvious feature in area and lifetime is a red-shifted
area in the trailing part of the region. SFO Doppler images show a more complex pattern, but still dominated by red shifts
in the trailing part of the region near the end of the day of 26 August. |
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