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Understanding NewAthena-WFI particle background through AMS, Chandra, and XMM-Newton

Presentation #105.22 in the session Missions and Instruments - Poster Session.

Published onMay 03, 2024
Understanding NewAthena-WFI particle background through AMS, Chandra, and XMM-Newton

Galactic cosmic ray (GCR) particles have a significant impact on the particle-induced background of X-ray observatories, and their flux exhibits substantial temporal variability, potentially influencing background levels. In this study, we present one-day binned high-energy reject rates derived from the Chandra-ACIS and XMM-Newton EPIC-pn instruments, serving as proxies for GCR particle flux. We systematically analyze the ACIS and EPIC-pn reject rates and compare them with the AMS proton flux. Our analysis initially reveals robust correlations between the AMS proton flux and the ACIS/EPIC-pn reject rates when binned over 27-day intervals. However, a closer examination reveals substantial fluctuations within each 27-day bin, indicating shorter-term variability. Upon daily binning, we observe finer temporal structures in the datasets, demonstrating the presence of recurrent variations with periods of ∼ 26 days and 24 days in ACIS and EPIC-pn reject rates, respectively, spanning the years 2014 to 2018. Notably, during the 2016–2017 period, we additionally detect periodicities of ∼ 13.5 days and 9 days in the ACIS and EPIC-pn reject rates, respectively.

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