Properties of the quiet sun magnetic fields as revealed through the spectrovideomagnetograph

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

ncc8828.pdf - Published Version

Download (161kB) | Preview
Official URL:


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
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

Actions (login required)

View Item View Item