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User-contributed Software
23 March 2006
User-contributed Software

Weekly Operations
February 5, 2004
Weekly Operations

Planning from RAL
February 5, 2004
Planning from RAL - Andrzej Fludra

Pointing Offsets
February 5, 2004
Pointing Offsets - Dave Pike

SOHO Keyholes - What's it all about?
February 5, 2004
SOHO Keyholes - Stein Vidar Haugan

New Principal Investigator and Project Scientist
September 17, 20, 2003
New Principal Investigator and Project Scientist

Programming in IDL - Sockets
January 20, 2003
IDL Sockets - Dominic Zarro

GIS Slit Anomaly Update
Wednesday, October 15, 2002
GIS Slit Anomaly Update - Jeff Payne

CDS-SOFT Mailing List Archive
Wednesday, October 15, 2002
CDS-SOFT Archive - Ron Yurow

GIS Slit Anomaly - Alternative GIS Studies
Wednesday, December 12, 2001
Follow this link: GIS Slit Anomaly - Alternative GIS Studies - Carl Foley

Future of IDL
Friday November 9, 2001

No doubt many of you have heard the very disturbing news from RSI, regarding the withdrawal of IDL support across a number of platforms. (Compaq Tru64, MAC, older Solaris versions). This news has caused uproar across the IDL user communities in Europe and I'm sure a similar response from the USA users. This affects many CDS users and for this reason we provide a summary of the current situation.

Representations are being made to Boulder by the head of the UK RSI office, with the support of the European offices, in an attempt to have the Tru64 decision reversed (it appears that they were not aware of the actual number of Tru64 platforms that are still being used !). Several avenues are being explored, however should they not bear fruit it may come down to the community having to pay extra money, perhaps via increased support fees - I am given to understand that the sum of money involved to continue the support for Tru64 is small, we are certainly not talking of mega bucks.

Some of you may have also read statements that RSI are not interested in the Space Research Community as we no longer figure amongst the big users of IDL. I am assured that that it is not true, at least not in Europe. While RSI are not making lots of money directly from us, they appreciate the large amount of indirect revenue that we generate.

If you feel strongly about this move by RSI and have not already contacted your local office I would encourage you to do so immediately. The more complaints they receive the stronger our case for Tru64 support. It is not too late to lodge your concerns. Who knows, this may be the thin end of a very big wedge that could remove UNIX as an IDL supported platform, leaving just Windows and Linux.

Please check back again for updates on this story as I am in contact with RSI UK, as this move by them will have a major impact on CDS and on our future missions.
-Jeff Payne

Another Intense Proton Storm
Friday November 9, 2001

Yet another flare & associated CME on November 4th generated a very strong proton storm. Initially the CDS team thought that they could continue observing, however, on Monday when the proton storm levels reached a category S4 it was decided to safe the instrument. Unfortunately as the proton levels receded on Tuesday, CDS remained in a safe mode ready for the upcoming s/c momentum management on Wednesday. The operations team then worked two late shifts, Wednesday and Thursday to ready CDS for the start of science operations early Friday morning.
- Jeff Payne

CDS Weathers a Proton Storm
Tuesday 9 October 2001

An X2.6 flare accompanied by a CME took place on 24 September at 9:36 UT, causing a proton storm that affected CDS operations. The shock front arrived at SOHO at about 12:00 UT and was followed by vastly increased numbers of what we commonly call 'cosmic ray hits' on the CCD of the NIS spectrometer. During events like this, Ron and Chris (CDS operators) monitor the proton levels recorded by the GOES proton monitor. When the E>50 MeV proton levels exceed 10 particles/cm^2/s/sr, the quality of CDS data drops significantly. Protons can also hit the CDS electronics and the potential for processor malfunction increases when the high-voltages are turned on. For these reasons, the CDS high voltages are lowered during proton events. CDS remained turned off from 24 September, 16:31 UT until 27 September, 22:00 UT. - Andrzej Fludra

CDS Slit Anomaly Update
Tuesday 9 October 2001

Further slit tests have been run and similar slit rastering problems have been observed using slits 1 & 3. The cause of which is still not understood. However during the past 2 months we have not seen any problem when selecting a new slit and so we are now removing the restrictions on the use of slit changes. However, studies that raster using slit movements remain banned, e.g., SPECT_1. Further, the use of slit numbers 1,2 & 3 must be co-ordinated with CDS OPS presence at GSFC. The weekly planning notes contain the details - Jeff Payne

CDS Slit Anomaly
Thursday 6 September 2001

In the June/July time frame CDS began running the new SPECT2 study - a N-S scan with the GIS, using slit rastering. It was found that during this study some of the recorded slit positions were incorrect and a look at the science data also indicated that there may be a slit position movement problem. As a precaution we have put a stop to all studies that use slit numbers 1, 2 & 3 and discouraged the use of slit 6. Over the past two weeks we have been running a number of slit tests. The results obtained so far are inconclusive and more testing will have to be scheduled. However, we are coming to the opinion that the problem is likely due to an onboard CDS software problem, though at present we are unable to see how this could directly affect the slit positions. In the meantime I am hoping that very soon we shall be able to permit the use of slits 1,2, 3 & 6, but under strictly controlled conditions, though slit position rastering will still not be permitted until a resolution to the problem is found. - Jeff Payne

IDL V5.4
Thursday 6 September 2001

The facilities at RAL are about to be upgraded to IDL V5.4, The operations and analysis facilities at GSFC will be updated within a month, assuming no problems arise. IDL V5.4 is now the official version under which to run all CDS software. IDL V5.5 is about to be relased by RSI, and initially support will only be offered by the CDS team on a best efforts basis. - Jeff Payne

WEB Site:
Thursday 6 September 2001

The CDS web site has undergone many enhancements over the summer with a few more planned changes to be released in the autumn. Both the UK and US mirror site are now in step. The ATLAS page has been improved to allow users to easily browse or select or search for studies. Our next step is to add facilities to allow users to display pointing information overlaid on the relevant EIT image by selecting studies or dates. - Jeff Payne

Secure Shell
Thursday 6 September 2001

We have now implemented OPEN SSH on all of the CDS computers at GSFC and at RAL. Users are encouraged to use SSH for 'telnet' type sessions as we shall be withdrawing telnet,rsh,rlogin,ksh & xron access. - SSH is being setup to automatically do X11 forwarding, ie. tunnel display windows through SSH. If your computer does not run SSH please contact your sys admin and arrange for its installation. Open SSH is supported on most Unix & LINUX platforms and the SSH Corporation have an excellent, low cost, version for PC's The next step in enhancing security is to implement secure ftp for the transfer of files, though a few problems have to be resolved first. Details will be announced later. - Jeff Payne

Items for the newsletter should be sent to the editor, Andrzej Fludra at

From the CDS Operations Management Team in the Space Science & Technology Department at CCLRC Rutherford Appleton Laboratory
Site maintained by John Rainnie.
Last revised on Wednesday (22/Mar/2006) at 13:29.