Small-Scale X-Ray/EUV Jets Seen in Hinode XRT and TRACE

Abstract

We present the morphological and kinematic characteristics of three small-scale X-ray/EUV jets simultaneously observed by the Hinode XRT and the TRACE. For this, we examined all XRT movies with a thin Al/Poly filter from 2006 October 20 to 2007 April 8, and then found 34 small-scale eruptions. We next took a look at the corresponding TRACE 171/195Å images associated with the eruptions. As a result, we found three simultaneous X-ray and EUV jets. For two different bands, they have similar characteristics in terms of the projected speed (90-310kms^-1), lifetime (100-2000s), and size (1.1-5×10⁵km). These characteristics are similar to the previous results by the Yohkoh SXT, but are quite different from EUV jets associated with Hα surges. From the EUV Imaging Spectrometer, four spectral lines for the last event, we found blueshift (up to -64kms^-1) and redshift (up to 20kms^-1) motions as well as nonthermal velocities ranging from 57 to 106kms^-1 at the jet footpoint. We note a tendency: the hotter the maximum ionization temperature is, the smaller the area of blueshift region is. These characteristics are consistent with a typical jet model that includes the magnetic reconnection between open coronal fields and emerging magnetic fields.