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Hubble's Radiation Damage Out of Phase with Solar Cycle, Affecting Image Quality
Key points
- Hubble's CCDs act as radiation dosimeters for over 24 years.
- Radiation damage rate is out of phase with the solar cycle.
- Empirical fits correct over 99.5% of damage effects on images.
- Results emphasize complex LEO radiation environments.
Hubble's Radiation Damage Pattern
The Hubble Space Telescope's CCD detectors have served as radiation dosimeters in Low Earth Orbit for more than 24 years. Analysis of these detectors revealed that the rate of radiation damage they sustained varied over each solar cycle. However, this variation was several years out of phase with the appearance of sunspots or coronal mass ejections, which are typical indicators of solar activity.
Correction Methods and Challenges
Researchers investigated functional forms to fit the time series of damage, including those used for telescopes elsewhere in the Solar system. While remarkably accurate empirical fits were achieved for Hubble data, correcting over 99.5% of the radiation damage's effect on image quality during post-processing, these fits often relied on physically absurd parameter values. Conversely, fits using physically reasonable parameters resulted in worse performance.
Implications for Space Environments
The findings underscore the diverse radiation environments present across the Solar system, particularly highlighting the intricate nature of Low Earth Orbit. This complexity makes accurate prediction of radiation effects challenging.
Future Mission Planning
The study motivates the continued monitoring of radiation damage on currently operational spacecraft. Such ongoing data collection is crucial for more reliably predicting the rate of degradation and the useful lifespan of future space missions, ensuring better design and operational planning.
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Primary sources
arXiv 2608.18214Reporting from
Research on the Hubble Space Telescope's CCD detectors found that radiation damage varied out of phase with the solar cycle, despite successful empirical correction methods. This finding highlights the complexity of radiation environments in Low Earth Orbit and the need for continued monitoring of spacecraft degradation.