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• W2886522122 abstract "Abstract Two solar proton events in September 2017 had a significant impact on the operation of the Super Dual Auroral Radar Network (SuperDARN), a global network of high‐frequency (HF) radars designed for observing F region ionospheric plasma convection. Strong polar cap absorption caused near‐total loss of radar backscatter, which prevented the primary SuperDARN data products from being determined for a period of several days. During this interval, the high‐latitude and polar cap radars measured unusually low levels of background atmospheric radio noise. We demonstrate that these background noise measurements can be used to observe the spatial and temporal evolution of the polar cap absorption region, using an approach similar to riometry. We find that the temporal evolution of the SuperDARN radar‐derived HF attenuation closely follows that of the cosmic noise absorption measured by a riometer. Attenuation of the atmospheric noise up to 10 dB at 12 MHz is measured within the northern polar cap, and up to 14 dB in the southern polar cap, which is consistent with the observed backscatter loss. Additionally, periods of enhanced attenuation lasting 2–4 hr are detected by the midlatitude radars in response to M‐ and X‐class solar flares. Our results demonstrate that SuperDARN's routine measurements of atmospheric radio noise can be used to monitor 8‐ to 20‐MHz radio attenuation from middle to polar latitudes, which may be used to supplement riometer data and also to investigate the causes of SuperDARN backscatter loss during space weather events." @default.
• W2886522122 created "2018-08-22" @default.
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• W2886522122 date "2018-10-01" @default.
• W2886522122 modified "2023-09-30" @default.
• W2886522122 title "SuperDARN Radar‐Derived HF Radio Attenuation During the September 2017 Solar Proton Events" @default.
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• W2886522122 doi "https://doi.org/10.1029/2018sw001916" @default.
• W2886522122 hasPublicationYear "2018" @default.
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