Substorm Manifestations at Radio Paths of Oblique Ionospheric Sounding in the Arctic

Blagoveshchensky, D. V.; Sergeeva, M. A.

doi:10.1007/s00024-020-02539-4

Cited by 1 publication

(1 citation statement)

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“…During times of enhanced D-region electron density, there is an increase in the Lowest Useable Frequency (LUF) (Milan et al, 1998;Uryadov et al, 2019) such that these lower frequency signals are unusable. In more extreme cases, electron density enhancements may allow new propagation modes, for example, enabling Auroral-E propagation (as opposed to F-region) in the auroral oval during strong events (Blagoveshchensky & Sergeeva, 2020;Milan et al, 1997Milan et al, , 1998Uryadov et al, 2019). Studies report electron density enhancements in the F region (higher foF2) prior to the substorm expansion phase (Blagoveshchensky & Kalishin, 2009) and magnetic storm onset (Danilov, 2013;Uryadov et al, 2019).…”

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confidence: 99%

Use of Terrestrial High Frequency Signals in Riometer Data to Explore the Size of D‐Region Electron Density Enhancements

Ghaly,

Spanswick,

Gillies

et al. 2024

JGR Space Physics

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This paper presents the first observations from the prototype Space Weather Adaptive Network (SWAN) riometers, which are capable of simultaneous measurements of narrow‐band terrestrial signal power and Cosmic Noise Absorption (CNA). We describe a methodology by which we can use coincident CNA and loss of known skywave‐mode, High Frequency (HF) signals to estimate a minimum size (geographic extent) of D‐region electron density enhancements. We demonstrate our technique with an example event. This methodology and early results provide a pathfinder for a continent‐wide array of SWAN instruments which would be capable of utilizing multiple intersecting terrestrial HF ray paths to reconstruct the size of D‐region electron density enhancements at the time of initial HF signal loss.

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