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ERS-1 Altimeter USO drift correction update

24 June 1997

On June 25th 1997, the ERS-1 USO file correction will be modified as to compensate for a 10.3 mm bias that were already applied to the altimetric range of data acquired between 14-10-1991 through 20-03-1995. Products concerned are the Altimeter URA FD (Fast Delivery data) and QLOPR (Quick Look Ocean PRoduct).
This correction makes the USO (Ultra Stable Oscillator) file now consistent with all clock period corrections used in the Low Rate Data Processing Facility (LRDPF).

ERS-2 manoeuvre

23 June 1997

The next ERS-2 orbit maintenance manoeuvre is scheduled for the night between June 30th and July 1st 1997. It will be a one burn FCM manoeuvre. Present preliminary planning is to make a Delta-V of 6.4 mm/s at 1:11 Z.

SAR wave mode: imminent data processor change

23 June 1997

The ERS-2 Low Rate Data Processing Facility (LRDPF) has been enhanced as to include the processing of the SAR wave data as from 25th June 1997. The algorithm remains unchanged. The switch will apply to the first Kiruna orbit followed by Maspalomas and Gatineau stations late on the same day.

Wind Scatterometer sigma-nought

18 June 1997

This new table compensates for the 0.2 dB increase of the sigma-nought observed after the switch to the redundant Calibration Subsystem on 6 August 1996.

Calibration Pulse Level Look-up Table Modified as from 18/6/97

16 June 1997

Due to a difference between the Calibration Subsystem DC/DC converter A and B on ERS-2, a new compensatory Look-Up-Table for the ERS-2 Scatterometer will be installed in all stations starting with the first orbit of Kiruna on Wednesday 18 June 1997.

ERS-2 has been moved in order to keep a nominal "ERS-1 and 2" satellites position

10 June 1997

ERS-2 has been moved in order to keep a nominal "ERS-1 and 2" satellites position.

Online product catalogue

02 June 1997

Opening of the first services from the new ESA Multimission RS Product Catalogue.

O' Higgins Campaign

29 May 1997

Instead of August-September 1997, the next "O'Higgins Campaign" has been anticipated to 26-Jun-97 (UTC 00:00) through 18-Jul-97 (UTC 10:00). Although the timespan covered is limited to 23 days a very good coverage of the area will be obtained. User requests for sensing during the above dates should be sent within June 4th 1997.

New version of SAR PRI calibration document

21 May 1997

A new version of the document Derivation of the Backscattering Coefficient Sigma-Nought in ESA ERS SAR PRI Products published H.Laur, P.Bally, P.Meadows, J.Sanchez, B.Schaettler, E.Lopinto has been released. Full text is available online. Several changes have been introduced. The most significant of which has been the removal of the replica correction factor possible thanks to the latest calibration findings on the ERS-2 satellite. ERS-2 - much more stable than ERS-1 - has actually shown that its replica power variations are strongly related to the transmission ones.

Earth Watching website improved

20 May 1997

5 new SAR images on the Red River flood (USA & Canada - April 1997). Earth Watching has been renewed and completed with new images, improved resolution and limited Kb. It now contains about 150 images divided in 4 groups: Fire events, Flood events, Oil Spill events and Volcanic events. 2 new items: Monitoring Etna's activity and the 1992 flood in Toscana (Italy).

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