UFO UpDates
A mailing list for the study of UFO-related phenomena
'Its All Here In Black & White'
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

* the detection of rivers of plasma beneath the surface of the

* 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.

To subscribe to SOHONEWS send mail to Majordomo@sohomail.nascom.nasa.gov with
an empty 'Subject:' line and 'subscribe sohonews' as the body of the message.
To send information to be distributed in SOHONEWS, please, send e-mail to
Luis Sanchez Duarte
SOHO Science Data Coordinator
European Space Agency

[ Next Message | Previous Message | This Day's Messages ]
This Month's Index |

UFO UpDates Main Index

UFO UpDates - Toronto - Operated by Errol Bruce-Knapp

Archive programming by Glenn Campbell at Glenn-Campbell.com