Physics
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002stin...0246802r&link_type=abstract
Technical Report, Johns Hopkins Univ. Laurel, MD United States Applied Physics Lab.
Physics
Magnetic Signatures, Sunspots, Solar Magnetic Field, Magnetic Dipoles, Filtergrams, Astronomical Polarimetry, Balloon-Borne Instruments, Data Processing, Error Analysis
Scientific paper
Using the Flare Genesis Experiment (FGE), a balloon-borne observatory with an 80-cm solar telescope we observed the active region NOAA 8844 on January 25, 2000 for several hours. FGE was equipped with a vector polarimeter and a tunable Fabry-Perot narrow-band filter. It recorded time series of filtergrams, vector magnetograms, and Dopplergrams at the Ca(I) 6122.2 angstrom line, and H-alpha filtergrams with a cadence between 2.5 and 7.5 minutes. At the time of the observations, NOAA 8844 was located at approximately 5 N 30 W. The region was rapidly growing during the observations; new magnetic flux was constantly emerging in three supergranules near its center. We describe in detail how the FGE data were analyzed and report on the structure and behavior of peculiar moving dipolar features (MDFs) observed in the active region. In longitudinal magnetograms, the MDFs appeared to be small dipoles in the emerging fields. The east-west orientation of their polarities was opposite that of the sunspots. The dipoles were oriented parallel to their direction of motion, which was in most cases towards the sunspots. Previously, dipolar moving magnetic features have only been observed flowing out from sunspots. Vector magnetograms show that the magnetic field of each MDF negative part was less inclined to the local horizontal than the ones of the positive part. We identify the MDFs as undulations, or stitches, where the emerging flux ropes are still tied to the photosphere. We present a U-loop model that can account for their unusual structure and behavior, and it shows how emerging flux can shed its entrained mass.
No associations
LandOfFree
The Flare Genesis Experiment does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Flare Genesis Experiment, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Flare Genesis Experiment will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1689506