9th July 1997:
The ADEOS satellite failed on 30th June 1997. The Earth-Probe TOMS instrument
continues to operate. The following text is taken from NASA's press release.



NASA's Total Ozone Mapping Spectrometer/Earth Probe instrument had also 
been providing high ground resolution research data to complement the 
global data of the spectrometer on ADEOS.  As a result, its orbit 
is different than TOMS/ADEOS.  The EP satellite has adequate fuel 
to raise its present 500 km orbit to an orbit near the 800 km 
ADEOS orbit, where contiguous Earth coverage is possible for 
monitoring of ozone and volcanic eruption clouds.  NASA is 
considering raising TOMS/EP to a higher orbit.

With this adjustment, much more complete global coverage of 
total ozone measurements previously provided by TOMS/ADEOS could 
be received.  However, some of the unique smaller-scale aerosols 
and ozone research being done by TOMS/EP would be lost.  The next 
Total Ozone Mapping Spectrometer mission is planned for launch on 
a Russian Meteor-3M spacecraft in 2000.