(Week 6, 1998)
8-Feb-98 17:00 UT
Otherwise, the SXT instrument continues to work without problems. A more detailed report of this week's activities is available here. For a summary index listing of the weekly science reports, click here.
There was a successful rocket flight, carrying the XDT experiment of the National Astronomical Observatory of Japan. This flight produced the first X-ray Dopplergrams, in an FeXIV emission line. See the SOHO/XDT coordination page for fuller details.
The solar activity was very low this week, much like during solar minimum. The GOES level never touched C1. However, we saw some nice eruptive events, which did not produce much X-ray emission. The one on 2 February occurred in the northern hemisphere slightly to the east of the central meridian. The following SXT images indicate that the eruption was probably between 13:43 and 14:31 UT. Indeed, the H alpha picture at 14:35 does not show a filament that is present at 09:35 UT.
This event did not show much X-ray emission. In the GOES data, which is shown below, it is not possible to isolate contributions from this event.
Another eruptive event was seen on 4 February at the noeth-western limb. This event may have proceeded rather slowly.
The counterpart in the GOES light curves is not clear. The impulsive emission just before 18:00 UT came from AR 8151, which was in the south-east quadrant. Does the increase in the GOES high channel starting 11 UT, explain the eruptive event?