Zirin, H. and Cameron, R. (2002) Properties of the quiet sun magnetic fields as revealed through the spectrovideomagnetograph. Il nuovo cimento C, 25 (5\6). pp. 557-563. ISSN 1826-9885
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Abstract
We present new observations of weak solar magnetic fields with an instrument which we term the spectrovideomagnetograph (SPVMG). Using the criteria introduced by Stenflo, we measure the Stokes V components for the lines FeI 5250 and 5247 in thousands of spectra. We find the ratios of the V amplitudes of the two lines track the g-factors closely and there is no evidence for fractional kilogauss fields in the quiet Sun. The strength of the flux threading the solar surface is just what we measure, with a filling factor near unity. Network elements range from 200 to 1200 gauss, as measured inthe IR, againwithout a filling factor. We calibrate by direct measures of the Zeemansplittin g at 1000 gauss. The g-factor ratio holds downto 20 gauss. The integral area (outside of sunspots) above a given field strength follows a power law with index −2, downto a turnover level of 200–300 G. At least 90% of the solar surface is covered by weak fields above 5 gauss, unipolar and mixed.
| Item Type: | Article |
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| Additional Information: | Paper presented at the International Meeting on THEMIS and the New Frontiers of Solar Atmosphere Dynamics, Rome, Italy, March 19-21, 2001. |
| Uncontrolled Keywords: | Solar instruments ; Polarimetry ; Electric and magnetic fields ; Photosphere, granulation ; Conference proceedings |
| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 12 Mar 2020 14:28 |
| Last Modified: | 12 Mar 2020 14:28 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/14846 |
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