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- W2070128086 abstract "Abstract Both HF ionosonde and VHF cosmic noise measurements have been used at DRTE, Ottawa, in recent studies of radio wave absorption phenomena. From VHF research, abnormal absorption at high latitudes has been divided into three categories: SID, auroral and polar cap. The present paper summarizes results from a study of “polar blackouts” (as observed on HF ionosonde equipment) in relation to polar cap absorption (as observed on riometers at 30 mc/s). Criteria are established for selecting those blackouts which correspond to polar cap absorption events. On the basis of these, a study of ionosonde data covering an eleven year solar cycle reveals some 40 events. The distribution of these events shows a close association with the mean sunspot number. Preliminary results on the spatial distribution of the auroral type of absorption at 30 mc/s indicate that the absorbing region may have a rapid transition (within 35 km at the 60 km level) as seen from the polar and zenith antennas at one site or may at times have a minimum extent of 380 km from measurements at two stations." @default.
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- W2070128086 date "1961-12-01" @default.
- W2070128086 modified "2023-09-26" @default.
- W2070128086 title "Study of polar cap and auroral absorption at HF and VHF frequencies" @default.
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- W2070128086 doi "https://doi.org/10.1016/0021-9169(61)90046-0" @default.
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