Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh32c04z&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SH32C-04
Physics
7524 Magnetic Fields
Scientific paper
We present new observations of weak solar magnetic fields from an instrument which we term the spectrovideomagnetograph (SPVMG). The sensing system of the videomagnetograph is attached to the Coude spectrograph at Big Bear and yields a high sensitivity. Using the criteria introduced by Stenflo, we measure the Stokes V and I components for the lines FeI 5250 and 5247 in hundreds of spectra. We find that from 20 to 350 gauss derived field strengths are strictly proportional to the g-factor and show no saturation. Hence the widely accepted strong invisible magnetic elements postulated by Stenflo do not exist. The filling factor is near unity. We measure the Zeeman splitting directly down to 200 gauss and find good correspondence with our V measure. We find that the area (outside of sunspots) of the solar surface occupied by magnetic field of different strengths follows a power law in the inverse square of the field strength. This applies to fields down to 200G. This has obvious relevance for turbulent surface dynamo models. We find that at least 90% of the solar surface is covered by weak fields above 5 gauss, sometimes unipolar and sometimes mixed.
Cameron Robert
Zirin Harold
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