Abstract. Due to the collection method, the acquisition environment and the LED's own light-emitting characteristics, the effect of LED point-by-point brightness correction will be affected, which results in the abnormal brightness area on the display. In this paper, a calibration method based on the brightness correction coefficient map is presented, which use s the step-by-step weighted shrinkage algorithm to post-process the correction coefficient in order to eliminate the abnormal area on the screen. The result showes that uniformity of the entire LED display is greatly improved and the deviation decreases from 12.86% before correction to the present 2.39%.
An extreme solar cosmic ray event broke out on 2005 January 20. Not only is it the most intensive solar energetic particle (SEP) event, with >100 MeV particles measured by GOES satellite since 1986, but it has been the largest ground level enhancement (GLE) event recorded by the ground-based neutron monitors since 1956. This work presents the solar proton spectra for this event with data obtained by GOES in multiple energy channels. These spectra are well fitted by a modified power-law function. The spectral index of around −1 indicates that the January 20 event has a hard energy spectrum. Possible mechanisms for the acceleration of relativistic protons are discussed.
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