|
|
| Mercury pass in front of Sun will get SOHO even better data |
| The celestial encounter between Mercury and the Sun on 15 November could help scientists gather more accurate information on the solar atmosphere than ever before.
This type of planetary transit is a rather uncommon event that happens at intervals of 7, 13, or 33 years.
|
| Date: 10 Nov 1999 |
|
|
| Now showing: live from the Sun ... to your computer |
| A new computer screen saver made available by the European Space Agency
now allows computer users to watch spectacular, almost real-time images
of our Sun. |
| Date: 05 Nov 1999 |
|
|
| Now showing: live from the Sun ... to your computer |
| A new computer screen saver made available by the European Space Agency
now allows computer users to watch spectacular, almost real-time images
of our Sun.
|
| Date: 05 Nov 1999 |
|
|
| SOHO's new software works perfectly - scientists and engineers overjoyed |
| Much to the elation of scientists, the Solar and Heliospheric Observatory is back in top gear with its newly installed software running flawlessly.
"Everything is just perfect," said Bernhard Fleck, SOHO Project
Scientist. "These engineers have been absolutely fantastic. They put
together a completely new flight software in less than a year under
tremendous pressure. They have been great and this is a tremendous
achievement." |
| Date: 05 Oct 1999 |
|
|
| SOHO gets new, more robust computer software |
| Just like personal computers on Earth, ESA's Solar and Heliospheric Observatory is getting a software upgrade of its own. After SOHO vanished in space in June 1998, engineers on two continents struggled for several weeks to regain control of the spacecraft. In December
1998, the loss of the last working gyroscope caused major orientation
problems and rapid fuel depletion. But once again, engineers and ground controllers put the satellite back in working order. By February
1999, an unprecedented solution - emergency software rushed up to SOHO - allowed it to reorient itself. Yet that fix, which has been working perfectly ever since, was only meant to be temporary. |
| Date: 28 Sep 1999 |
|
|
| Latest SOHO images -- a new service for the solar eclipse |
| The media and the web-surfing public, including teachers, now have
instant access to the newest images of the Sun from the ESA-NASA SOHO
spacecraft. In addition to still pictures from selected instruments,
movies compiled from images of the previous 48 hours are available on-
line. Although its introduction is timely, with a total eclipse of the
Sun due on 11 August, this service of "The very latest SOHO images" will
be used by solar physicists and space weather forecasters for years to
come. |
| Date: 04 Aug 1999 |
|
|
| PR 29-1999: Solar wind surfs waves in the Sun's atmosphere! |
| Solar scientists believe they may have solved yet another long-standing enigma about the Sun. Working on data first gathered from the ESA's Solar and Heliospheric Observatory (SOHO) and then by NASA's Spartan 201 spacecraft, researchers have found that the solar wind streams out of the Sun by "surfing" waves in the Sun's atmosphere. |
| Date: 08 Jul 1999 |
|
|
| SOHO glimpses far side of the Sun, looks at a comet's shadow |
| Scientists have found that they can peek around the Sun and predict whether solar storms on its far side will shortly appear on the side facing the Earth. This surprising discovery by SOHO's SWAN instrument could help to predict the solar storms that sometimes threaten the Earth. SWAN has seen something else extraordinary - the biggest shadow ever observed in our solar system, that of a comet projected on the sky behind it.
|
| Date: 22 Jun 1999 |
|
|
| SOHO team commended for the recovery effort |
| "2% inspiration, 98% transpiration! A tribute to the dedicated personal efforts of 160 people all over the world" was how Francis Vandenbussche (ESA Recovery Manager) described the SOHO rescue mission, on accepting a Silver ESTEC Medal on behalf of the entire SOHO Recovery Team at a private function at ESTEC last Thursday 27 May.
|
| Date: 07 Jun 1999 |
|
|
| SOHO real-time web watch |
| The Solar and Heliospheric Observer (SOHO), a joint ESA/NASA
space mission, observed a large coronal mass ejection (CME) on the Sun on 1
June 1999, at 19:37 Universal Time. It was first spotted by solar physicists
at the American Astronomical Society meeting in Chicago, where the SOHO data
were being displayed in real time at the
ESA/SOHO exhibition booth, via an internet connection to NASA's Goddard Space
Flight Center in Maryland.
|
| Date: 04 Jun 1999 |
|
|
| SOHO ready for next cosmic events |
| Three months after a challenging, long-distance space rescue, the European Space Agency's Solar and Heliospheric Observatory (SOHO) is preparing for two important cosmic events: the 11 August solar eclipse in Europe and Asia - the last of this millennium - and an increase in solar activity on the Sun itself, called a solar maximum - the
first of the next millennium. |
| Date: 17 May 1999 |
|
|
| INFO 01-1999: SOHO finds source of high speed wind blowing from the Sun |
| Like water gushing through cracks in a dam, scientists observed "fountains" of electrified gas, called the solar wind, flowing around magnetic regions on the Sun to begin their 3-million-kilometre-per-hour rush into space. Scientists have identified regions on the Sun where the high speed solar wind - a stream of electrified gas affecting Earth's space environment - originates. |
| Date: 04 Feb 1999 |
|
|
| PR 05-1999: SOHO Gets Back to Work - Historic First in Space |
| For the second time in six months, engineers have revitalised ESA's orbiting solar observatory SOHO, and have also set a space record.
The spacecraft went into a self-protection mode (called Emergency Sun Reacquisition - or ESR) on 21 December, when the last of its three gyroscopes failed. Having lost a fundamental orientation system, SOHO continually fired onboard jets to keep its sensors pointed toward the sun. |
| Date: 03 Feb 1999 |
|
|
| Roger Bonnet meets the SOHO team at Goddard |
| As part of a four-day American tour on current European/US cooperative projects, Prof. R.M. Bonnet, ESA's Director of Science, today visited NASA Goddard Spaceflight Center (GSFC). During the visit he met with the SOHO management and operations teams, both to review forthcoming operations on SOHO and, more importantly, to offer his personal congratulations for the extraordinary efforts they put into the recovery of SOHO in the period June to October last year.
|
| Date: 26 Jan 1999 |
|
|
| SOHO in safe mode |
| At 17:49 UTC on 21 December, the SOHO Spacecraft went into
Emergency
Sun Reacquisition (ESR). Following a successful gyro calibration
manoeuvre,
prior to a planned orbit correction and momentum wheel management
activities,
the last of SOHO's gyros (Gyro B) failed to give the expected output.
This occurred during transition from normal mode to momentum dumping mode,
and resulted in the spacecraft transitioning into ESR-10.
|
| Date: 22 Dec 1998 |
|
|
| SOHO Recertification Board recommendations |
| The SOHO recertification board, jointly chaired by ESA and NASA, met at Goddard Space Flight Center (GSFC) on 2 and 3 December. The Board made a number of conclusions and recommendations, the first of which was to commend the 'outstanding achievements of the SOHO recovery team'.
|
| Date: 07 Dec 1998 |
|
|
| SOHO support for the Shuttle mission |
| SOHO has been providing support for the Spartan 201-5 mission, which was deployed from the Space Shuttle Discovery (STS-95) on 1 November and successfully captured again two days later. |
| Date: 04 Nov 1998 |
|
|
| INFO 35-1998: SOHO is nearly back in business |
| Brilliant new pictures of the Sun from the solar spacecraft SOHO show that its ordeal is coming to a happy ending, nearly four months after the ESA/NASA mission seemed lost in space on 24 June. Images from the Michelson Doppler Imager and the Extreme Ultraviolet Imaging Telescope on SOHO (the Solar and Heliospheric Observatory) can be already seen on the Internet. |
| Date: 15 Oct 1998 |
|
|
| PR 33-1998: SOHO pointing at the Sun again |
| The SOHO solar spacecraft yesterday, 16 September 1998, obeyed commands that turned its face fully towards the Sun. For the first time since 25 June, when SOHO spun out of control and communication was lost, it points the right way. The SOHO flight operations team reported success in the manoeuvre, which is called attitude recovery, at 18:30 UT on 16 September 1998. |
| Date: 17 Sep 1998 |
|
|
| SOHO mission interruption joint ESA/NASA investigation board |
| The SOHO mission interruption joint ESA/NASA SOHO investigation board
concludes that "there were no anomalies on-board the SOHO spacecraft but that a number of ground errors led to the major loss of attitude experienced by the
spacecraft."
The full report is now available on-line. |
| Date: 04 Sep 1998 |
|
|
