Scaling Law of Solar Coronal Loops Obtained with YOHKOH

Abstract

We find a clear correlation among the maximum temperature T<SUB>max</SUB> (K), the pressure p (dyn cm<SUP>-2</SUP>) and the length L (cm) of 32 steady coronal loop structures observed with Yohkoh Soft X-Ray Telescope: T<SUB>max</SUB> = 3.8 × 10<SUP>4</SUP> (pL)<SUP>1/(5.1±0.5)</SUP>. The best-fit equation, however, systematically deviates from the theoretical scaling law T<SUB>max</SUB> = 1.4 × 10<SUP>3</SUP> (pL)<SUP>1/3</SUP> derived by Rosner, Tucker, &amp; Vaiana. We examine various possibilities for the cause of the discrepancy.