Plasma motion in coronal loops

Three-dimensional images of solar coronal loops are constructed based on Hα observations obtained on June 15, 1982, and EUV data obtained by TRACE on November 6, 1999. Our analysis of these structures shows that coronal-plasma motion in crossed fields can form loops, in accordance with the theoretical model proposed by Kazarov and Molodenski\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document} $$\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}$$ \end{document}. In general, the singular points in the magnetic fields of the active regions considered and the footpoints of the loops agree in location.