Subject: [SLR-Mail] No.2061: URGENT MAIL - Envisat Major Anomaly
From: Pierre.Femenias@esa.int

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SLR Electronic Mail          2012-04-11 07:10:48 UTC           Message No.  2061
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Author: Pierre Féménias ESA ESRIN

URGENT MAIL - Envisat Major Anomaly

Dear all,

Since Sunday 8 April 2012, at the Kiruna pass at 12:28UTC, Envisat is not
transmitting any telemetry anymore. Only an un-modulated S-Band RF carrier
was received on-ground. No X-Band and Ka-Band (via Artemis) data were
received as from the same time.

An extended network of ground stations was immediately activated to send
commands to the satellite, but all attempts are unsuccessful so far. The
S-band carrier which was initially still available disappeared after few
hours.


Can you please confirm if the Envisat satellite is visible from the different
laser stations?


Thanks for your prompt support.


Kind regards, Pierre Féménias





ESA - European Space Agency

Pierre Féménias
EOP-GMQ
Sensor Performances, Products and Algorithms Office
Earth Observation Ground Segment Department

ESRIN
Via Galileo Galilei
Casella Postale 64 I-00044 Frascati, Italy
Pierre.Femenias@esa.int | www.esa.int
T +39 06 941 80674 | F +39 06 941 80612






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