SOHO Status Report - January 2009
Operations & Archiving
A nominal station keeping manoeuvre and 180° roll were performed on 21 August 2008, for which 0.059 kg of fuel was used. The remaining hydrazine is 117 kg. The solar array degradation after 153 months of flight is 19.8%, which corresponds to 1.55% per year. All SOHO data is in the public domain. Links to the SOHO archives (including mirrors) are accessible at http://soho.esac.esa.int/data/.
On 25 June 2008 SOHO captured its 1500th comet.
On 11-15 August 2008 the 21st SOHO Workshop was held in Boulder, Colorado, USA, covering all areas of helio- and astroseismology, with special emphasis on what these methods have taught us about the dynamo generation of solar and stellar magnetic fields.
A new method for predicting the approach and intensity of hazardous particles from extreme solar events that would threaten astronauts and technology was for the first time tested under operational conditions during the Atlantis Shuttle Mission. Based on COSTEP measurements of relativistic electrons, it permits up to an hour of warning for the later arriving protons in solar energetic particle events.
A correlation is found between energy in the solar oscillation spectrum from 10 years of VIRGO disk-integrated sunlight data and the solar X-ray flux suggesting that flares drive global oscillations in the Sun in the same way that the entire Earth is set ringing for several weeks after a major earthquake.
Over 3250 papers have been published in the refereed literature.