LI XiaoBo1; BUCHNER Jorg2; ZHANG HongQi1
Source Publicationscienceinchinaseriesgphysicsmechanicsastronomy
AbstractThis research alms for an objective identification, tracking, and a statistical analysis of the Moving Magnetic Features (MMFs) around sunspots using SOHO/MDI high-resolution magnetograms. To this end, we develop a computerized tracking program and study the motion and magnetism of the outflows of MMFs around 26 sunspots. Our method locates 4-27 MMFs per hour, with higher counts for large sunspots. We differentiate MMFs into type alpha that have a polarity opposite to the parent sunspots, and type beta that share the sunspot's polarity. These sunspots' MMF subsets exhibit a wide range of central tendencies which have distinctive correlations with the sunspots. In general, alpha-MMFs emerge farther from the sunspot, carry less flux, and move faster than beta-MMFs. The typical alpha/beta-MMFs emerge at 2.2 - 8.1/0.1 - 3.2 Mm outside the penumbra limb, with lifetimes of 1.1 - 3.1/1.3 - 2.0 h. They are 1.1 - 6.6/1.4 - 3.6 Mm(2) in area and carry 1.4 - 12.5/4.8 - 11.4 x 10(18) Mx of flux. They travel a distance of 2.7 - 5.9/2.8 - 3.6 Mm with the speed of 0.5 - 0.9/0.4 - 0.7 km/s. Compared to the alpha-MMFs produced by large sunspots, those of small spots are smaller. They emerge closer to sunspot, move farther, live longer, and carry less flux. beta-MMFs show much less correlation with the sunspots. The flux outflow carried by the MMFs ranges from 0.2 to 8.3 x 10(19)Mx.h(-1) and does not show obvious correlation with the sunspots' evolution. The frequency distributions of the MMFs' distance traveled, area, and flux are exponential. This suggests the existence of numerous small, weak, and short-timescale magnetic objects which might contribute to the sunspot flux outflow.
Document Type期刊论文
2.Max-Planck-Institut fur Sonnensystemforschung
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
LI XiaoBo,BUCHNER Jorg,ZHANG HongQi. trackingmovingmagneticfeaturesinthephotosphere[J]. scienceinchinaseriesgphysicsmechanicsastronomy,2009,52(11):1737.
APA LI XiaoBo,BUCHNER Jorg,&ZHANG HongQi.(2009).trackingmovingmagneticfeaturesinthephotosphere.scienceinchinaseriesgphysicsmechanicsastronomy,52(11),1737.
MLA LI XiaoBo,et al."trackingmovingmagneticfeaturesinthephotosphere".scienceinchinaseriesgphysicsmechanicsastronomy 52.11(2009):1737.
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