Computer Science
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008adspr..42..888g&link_type=abstract
Advances in Space Research, Volume 42, Issue 5, p. 888-894.
Computer Science
5
Scientific paper
By analyzing the vector magnetograms of Huairou Solar Observing Station (HSOS) taken at the line center (0.0 Å) and the line wing (-0.12 Å) of FeI λ5324.19 Å, we make an estimate of the measured errors in transversal azimuths (δϕ) caused by Faraday rotation. Since many factors, such as the magnetic saturation and scattered light, can affect the measurement accuracy of the longitudinal magnetic field in the umbrae of sunspots, we limit our study in the region ∣Bz∣ < 800 G. The main mean azimuth rotations are about 4°, 6°, 7° and 9°, while ∣Bz∣ are in the ranges of 400 500 G, 500 600 G, 600 700 G and 700 800 G, respectively. Moreover, we find there is also an azimuth rotation of about 8° at the wavelength offset -0.12 Å of the line compared against a previous numerical simulation. We calculate the average electric currents (Jz) of 393 magnetograms in the region 500 G < ∣Bz∣ < 800 G. After the average correction to azimuths with the above estimations, the mean value of current in active regions
Gao Yanfang
Xu Haiqing
Zhang Hongqi
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