Physics
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985svmf.nasa..437r&link_type=abstract
In its Meas. of Solar Vector Magnetic Fields p 437 (SEE N85-29869 18-92)
Physics
Magnetic Flux, Magnetic Signatures, Solar Activity, Solar Physics, Vector Analysis, Magnetic Disturbances, Magnetic Fields, Photosphere
Scientific paper
In NOAA Active Region 2372 (April 1980), 4 x 10 to the 20th power maxwell of magnetic flux concentrated within a 30" circular area disappeared overnight. Vector magnetograms show that all components of the magnetic field weakened together. If the field had weakened through diffusion or fluid flow, 80% of the original flux would still have been detected by the magnetograph within a suitably enlarged area. In fact there was at least a threefold decrease in detected flux. Evidently, magnetic field was removed from the photosphere. Since the disappearing flux was located in a region of low magnetic shear and low activity, it is unlikely that the field dissipated through reconnection. The most likely possibility is that flux submerged. Observations suggest that even in the growth phase of active regions, submergence is a strong process comparable in magnitude to emergence.
Hagyard Mona J.
Moore Robert L.
Rabin Douglas M.
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