In the display above (click to enlarge), the solar X-ray fluence seen by RESIK (black points)  is plotted atop GOES red line. Only periods with good spectral measurements are indicated. The total number of good spectral measurements is given in the title line.

New mode exercise:	From Wed Oct 30 around 21:02 UT we introduced (since then-on) the new mode of HV and ADS settings as standard. The reason is a better handling of unwanted Si fluorescence with this settings
Calibration :	No calibrations  made
ADS Settings:	New HV are the following: Det. A - 1450 V, Det. B - 1389 V New ADS settings used are  presented below
	Channel		l Band	ADS
	#1	#2	3.37 - 3.88 Å : 35 -   85
	#2	#0	3.82 - 4.33 Å : 70 - 120
	#3	#3	4.31 - 4.89 Å : 55 - 110
	#4	#1	4.96 - 6.09 Å : 90 - 160
			software indexes
		spectroscopic notation (papers)

Strange spectral features seen recently by RESIK

While looking into day to day variations of the overall spectral appearence from the Catalogue pages (http://www.cbk.pan.wroc.pl/2002.htm), we noticed strange bumps appearing on the spectral records beginning on approximately October 19-20. These bumps (see http://www.cbk.pan.wroc.pl/2002/RDC_20021023.htm for 23rd October) and the figure below are initially seen on detector B only, occupying the bin area towards the higher bin numbers.(i.e. above bin No ~120 on 23rd October).

Later on this emission bump moves in a regular way towards lower bin area (http://www.cbk.pan.wroc.pl/2002/RDC_20021027.htm).

On 1st November another "new  bump" (http://www.cbk.pan.wroc.pl/2002/RDC_20021101.htm) becomes visible on detector A (both spectra) propagating slowly with time also towards lower bins. At the same time the first bump is moving slowly away from detector B.

 These  bumps moved out by now through half of the bin range  from both detectors  (http://www.cbk.pan.wroc.pl/2002/RDC_20021106.htm).

We are trying to understand the nature of this very much unwanted bumps, which distort solar spectra substantially. Mirek Kowalinski, our chief RESIK engineer, rules out instrumental effects as a reason, as all technical parameters i.e. voltages, temperatures, rad. environment sensors looks unchanged in their behaviour.

One of the possibilities, we consider now in detail could be that some unknown (to us) X-ray source(s) directly illuminate detectors sideways (i.e. non-solar X-ray illumination). We are looking for a possible candidates.

 Next week: detailed Legend to the Catalogue page.

 Report prepared by: Janusz Sylwester js@cbk.pan.wroc.pl

The report presented  has been done in "real time" and so it may contain jargon, blunders, or trivialities. We do not have also an English native speaker in our Wroclaw group! We would be happy to discuss problems mentioned above in more details  if necessary.
RESIK data are in the open public domain and can be requested from: http://surfwww.mssl.ucl.ac.uk/surf/data_request.html.

Page made on 07 November 2002 by: Jarek Bakala jb@cbk.pan.wroc.pl