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HD 16862


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A magnetic neutral sheet as cause of the flare productivity of a delta sunspot group
Flare observations in the solar activity complex HR 16862, 16863, 16864at the end of May 1980 are compared with the structure of force-freemagnetic fields calculated from photospheric magnetograph measurements.A series of homologous flares connected with a delta configuration in HR16864 was possibly caused by a magnetic neutral sheet. The deltaconfiguration consisted of the large preceding spot of HR 16864 and asmall satellite of opposite polarity. All magnetic flux from thesatellite is connected to the main spot, and at the outer edge of thesatellite, away from the main spot, a magnetic neutral sheet is found.This agrees with the observation that the entire penumbra was situatedbetween parent spot and satellite, which is typical of such deltaconfigurations. It is suggested that the flare productivity of theseconfigurations is generally caused by magnetic neutral sheets at thepenumbra-free outer boundary of the satellites.

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Takýmyýldýz:Balina
Sað Açýklýk:02h41m57.70s
Yükselim:-10°25'47.5"
Görünürdeki Parlaklýk:10.156
özdevim Sað Açýklýk:-12.4
özdevim Yükselim:-49.1
B-T magnitude:10.867
V-T magnitude:10.215

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 16862
TYCHO-2 2000TYC 5288-895-1
USNO-A2.0USNO-A2 0750-00619748
HIPHIP 12595

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