[Fwd: SOHO Spacecraft Observations Interrupted]
Mike DiMuzio (mdimuzio@cisnet.com)
Fri, 26 Jun 1998 13:18:14 +0000
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This is a forwarded NASA News Release about SOHO
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Mike DiMuzio mdimuzio@cisnet.com
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Date: Fri, 26 Jun 1998 10:23:37 -0400 (EDT)
Message-Id: <199806261423.KAA17999@spinoza.public.hq.nasa.gov>
From: NASANews@hq.nasa.gov
Subject: SOHO Spacecraft Observations Interrupted
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To: undisclosed-recipients:;
Don Savage
Headquarters, Washington, DC
June 26, 1998
(Phone: 202/358-1727)
Bill Steigerwald
Goddard Space Flight Center, Greenbelt, MD
(Phone: 301/286-5017)
Franco Bonacina
European Space Agency Headquarters, Paris, France
(Phone: 33-1-5369-7713)
RELEASE: 98-112
SOHO SPACECRAFT OBSERVATIONS INTERRUPTED
Ground controllers lost contact with the NASA/European Space
Agency (ESA) Solar and Heliospheric Observatory (SOHO) spacecraft June
24 during maintenance operations.
SOHO went into emergency sun reacquisition mode, and ground
controllers lost contact with the spacecraft at 7:16 p.m. EDT on June
24. This mode is activated when an anomaly occurs and the spacecraft
loses its orientation toward the Sun. When this happens, the spacecraft
automatically tries to point itself toward the Sun again by firing its
attitude control thrusters under the guidance of an onboard Sun sensor.
Efforts to re-establish contact with SOHO did not succeed and
telemetry was lost. Subsequent attempts using the full NASA Deep Space
Network capabilities have so far also not been successful.
Engineers from NASA and ESA are attempting to reestablish contact
with the spacecraft.
SOHO is a joint mission of the European Space Agency and NASA.
It was launched aboard an Atlas IIAS rocket from Cape Canaveral Air
Station, FL, on Dec. 2, 1995, and mission operations are directed from
NASA's Goddard Space Flight Center, Greenbelt, MD.
In April 1998, SOHO successfully completed its nominal two-year
mission to study the Sun's atmosphere, surface and interior. Major
science highlights include the detection of rivers of plasma beneath the
surface of the Sun; the discovery of a magnetic "carpet" on the solar
surface that seems to account for a substantial part of the energy that
is needed to cause the very high temperature of the corona, the Sun's
outermost layer; the first detection of flare-induced solar quakes; the
discovery of more than 50 sungrazing comets; the most detailed view to
date of the solar atmosphere; and spectacular images and movies of
coronal mass ejections, which are being used to improve the ability to
forecast space weather.
More information and images from SOHO can be found on the
Internet at:
http://sohowww.nascom.nasa.gov/
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