科研之友
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摘要
Semel and Skumanich proposed a method to obtain the absolute electric current density, vertical bar Jz vertical bar, without disambiguation of 1800 in the transverse field directions. The advantage of the method is that the uncertainty in the determination of the ambiguity in the magnetic azimuth is removed. Here, we investigate the limits of the calculation when applied to a numerical MHD model. We have found that the combination of changes in the magnetic azimuth with vanishing horizontal field component leads to errors, where electric current densities are often strong. Where errors occur, the calculation gives vertical bar Jz vertical bar too small by factors typically 1.2 - 2.0.
- 出版日期2009-11
