Fast appearances and disappearances of weak intranetwork magnetic fields
Abstract
Results are presented of the analysis of magnetograms obtained, under conditions of best visibility, at the Huairou Station of the Beijing Observatory on September 5, 1988. The magnetograms showed the existence of weak intranetwork magnetic fields (INFs) which were appearing and disappearing, with a maximum flux B between 5 and 10 G. Evidence is presented that the weak appearing and disappearing INFs are real structures; about 70 percent of INFs become undetectable at the level of about 5 G after 3.4 min of observation; about 30 percent of INFs can be seen again. The number of weak INFs decreases exponentially with time, leading to an upper limit of about 3 min for the mean life of a weak INF. It is suggested that a weak INF is a collection of unresolved flux elements, with a flux between 2.0(+16) and 1.0(+18) Mx.
- Publication:
-
Acta Astronomica Sinica
- Pub Date:
- March 1990
- Bibcode:
- 1990AcASn..31...63S
- Keywords:
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- Magnetic Signatures;
- Seeing (Astronomy);
- Solar Magnetic Field;
- Magnetic Flux;
- Statistical Analysis;
- Solar Physics