(Week 32, 1998)
The SXT instrument had no problem. The images for the movie temporarily looked bad because of a poor sunset image used for straylight correction. These images have been regenerated and they look fine. Solar activity was again relatively low. We had a successful second week of a campaign to observe signatures of flux emergence, as initiated by Hida Observatory, even though the weather was not necessarily cooperative there. See the weekly operations report for details. The GOES level was increasing due to AR 8293 and AR 8296, and several C class flares occurred during the second half of the week. As usual, the GOES time series for the week is shown below. Click it for enlargement.
In the display above (click to enlarge), the colored lines show the times of SXT images that currently are on-line at ISAS. The purple lines are flare mode. The gaps will be considerably reduced when the NASA telemetry arrives and gets reformatted. For a summary index listing of the weekly science reports, click here.
This week's targets for the Hida emerging flux campaign were AR 8294/95 and AR 8293. The purpose of the campaign was to observe signatures of flux emergence simultaneously at different layers of solar atmosphere. These signatures include arch filament systems (AFSs), surges, X-ray jets and loop brightenings.
The complex AR 8294/95 was relatively stable as far as X-ray observations were concerned, but AR 8293 showed many dynamic phenomena. As an example, we show a nearly simultaneous set of images from SXT and TRACE taken around the time of an X-ray jet. The left arrow points to the jet seen by SXT. The right arrow seems to be a loop brightening at the leading edge of the region. The role of emerging flux will be studied using data in the other wavelength including optical. This region shows a nice cusp structure in SXT images, and we will be looking for a counterpart in TRACE. Click the figure below.
