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Location: UFOUpDatesList.Com > 1998 > Jun > Jun 27

SOHONEWS 1998-06-26: SOHO Observations Interrupted

From: Scott Jordan <sjordan@sympatico.ca>
Date: Fri, 26 Jun 1998 05:08:55 -0400
Fwd Date: Sat, 27 Jun 1998 11:11:50 -0400
Subject: SOHONEWS 1998-06-26: SOHO Observations Interrupted


Check this out.


Date: Fri, 26 Jun 1998 14:55:11 -0400 (EDT)
From: Luis Sanchez Duarte <lsanchez@esa.nascom.nasa.gov>
Subject: SOHONEWS 1998-06-26: SOHO Observations Interrupted
To: sohonews@esa.nascom.nasa.gov


SOHONEWS - June 26, 1998
------------------------

SOHO spacecraft observations interrupted

26 June 1998. At 01:16 Paris time on 25 June 1998 (23:16 GMT 24
June), during routine maintenance operations, ground controllers
lost contact with the SOHO (Solar and Heliosopheric Observatory)
spacecraft and the satellite went into Emergency Sun
Reacquisition (ESR) mode. The ESR mode is activated when an
anomaly occurs and the spacecraft loses its orientation towards
the Sun. When this happens, the spacecraft automatically tries
to point itself towards the Sun again by firing its attitude
control thrusters under the guidance of an onboard Sun sensor.

Efforts to re-establish nominal operations did not succeed and
telemetry was lost. Subsequent attempts using the full NASA Deep
Space Network capabilities have so far been unsuccessful.

ESA and NASA engineers are continuing with the task of
re-establishing contact with the spacecraft.

The SOHO mission is a joint undertaking of ESA and NASA. The
spacecraft was launched aboard an Atlas II rocket from Florida
on 2 December 1995 from the Cape Canaveral Air Station. Mission
operations are directed from the control center at NASA Goddard
Space Flight Center in Maryland, USA.

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 temperatures 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;

* spectacular images and movies of Coronal Mass Ejections, which
are being used to improve the ability to forecast space weather.


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_____________________________________________________________________________
Luis Sanchez Duarte
SOHO Science Data Coordinator
European Space Agency

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