Monitoring the Chandra X-Ray Observatory Radiation Environment: Correlations between GOES-8 and Chandra/EPHIN, During DOY 89-106, 2001

Details Monitoring the Chandra X-Ray Observatory Radiation Environment: Correlations between GOES-8 and Chandra/EPHIN, During DOY 89-106, 2001 Monitoring the Chandra X-Ray Observatory Radiation Environment: Correlations between GOES-8 and Chandra/EPHIN, During DOY 89-106, 2001

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mwoc.conf..411v&link_type=abstract

Multi-Wavelength Observations of Coronal Structure and Dynamics -- Yohkoh 10th Anniversary Meeting. Proceedings of the conferenc

Physics

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The time period between DOY 89 (March 30) and DOY 106 (April 16), 2001 will likely be remembered as one of the most active time spans in this solar cycle. During this period of activity, the Sun unleashed many M and X-class solar flares. Two of which, an X20 and an X17, were amongst the largest solar flares recorded in the last 10 years. Indeed the sunspot group responsible for this activity, AR 9393, will also likely be recorded as the most active sunspot group of this solar cycle. The Chandra X-ray Observatory, NASA's latest "Great Observatory", was launched on July 23, 1999. The highly elliptical orbit of the CXO (perigee ~ 10,000 km, apogee ~ 140,000 km, 28.5 degree initial inclination) takes the satellite outside of the Earth's magnetosphere during a large fraction of the year. In this location, the CXO is directly exposed to the particles released during solar flares/CMEs, resulting in high background and possible damage to the science instruments. In this poster, we present data from the radiation monitor on-board the CXO, the EPHIN, as well as from the EPAM instrument on-board the ACE satellite (located at L1), and the SEM instrument on-board the GOES-8 satellite (in a geostationary, near-Earth orbit). In particular, we find a very strong correlation between the EPHIN P4 channel and the GOES-8 P2 channel; there is also a correlation between the EPHIN P41 channel and the GOES-8 P5 channel. These correlations allow the Science Operations Team of the CXO to better gauge the radiation environment of the CXO and to take preventive measures, such as suspending science and protecting the science instruments, when necessary.

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