All‐sky interferometric riometry

McKay, D. J.; Fallows, R. A.; Norden, M. J.; Aikio, Anita; Vierinen, Juha; Honary, F.; Marple, S.; Ulich, Thomas

doi:10.1002/2015rs005709

Cited by 4 publications

(1 citation statement)

References 30 publications

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“…In the same way, radar imaging can be used to supplement airglow imagers, providing a different view of the same geographic regions and also operating through gaps in airglow data during the day and on cloudy nights. The array might also be used for space weather studies in a passive imaging mode as an interferometric riometer (McKay et al, 2015), and scintillation measurements could provide additional data on ionospheric irregularities and structure Booker and Tao, 1987).…”

Section: Space Weathermentioning

confidence: 99%

Science goals for a high-frequency radar and radio imaging array

Isham,

Bullett,

Gustavsson

et al. 2023

Front. Astron. Space Sci.

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A medium and high-frequency antenna array for radar and radio imaging of the ionosphere is planned for installation in Aguadilla, Puerto Rico. Science goals include the study of space weather, radio propagation, meteors, lightning, and plasma physics. Radio imaging is ideal for the study of stimulated ionospheric radio emissions, such as those induced by the Arecibo Observatory high-power HF radio transmitter, which is likely to be restored to operation in the near future. The array will be complemented by a wide variety of instruments fielded by collaborators, and will be a rich source of student projects at all levels.

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Section: Space Weathermentioning

confidence: 99%

Science goals for a high-frequency radar and radio imaging array

Isham,

Bullett,

Gustavsson

et al. 2023

Front. Astron. Space Sci.

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Multi-static spatial and angular studies of polar mesospheric summer echoes combining MAARSY and KAIRA

et al. 2018

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Abstract. Polar mesospheric summer echoes (PMSEs) have been long associated with noctilucent clouds (NLCs). For large ice particles sizes and relatively high ice densities, PMSEs at 3 m Bragg wavelengths are known to be good tracers of the atmospheric wind dynamics and to be highly correlated with NLC occurrence. Combining the Middle Atmosphere ALOMAR Radar System (MAARSY) and the Kilpisjärvi Atmospheric Imaging Receiver Array (KAIRA), i.e., monostatic and bistatic observations, we show for the first time direct evidence of limited-volume PMSE structures drifting more than 90 km almost unchanged. These structures are shown to have horizontal widths of 5–15 km and are separated by 20–60 km, consistent with structures due to atmospheric waves previously observed in NLCs from the ground and from space. Given the lower sensitivity of KAIRA, the observed features are attributed to echoes from regions with high Schmidt numbers that provide a large radar cross section. The bistatic geometry allows us to determine an upper value for the angular sensitivity of PMSEs at meter scales. We find no evidence for strong aspect sensitivity for PMSEs, which is consistent with recent observations using radar imaging approaches. Our results indicate that multi-static all-sky interferometric radar observations of PMSEs could be a powerful tool for studying mesospheric wind fields within large geographic areas.

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Pulsating aurora and cosmic noise absorption associated with growth-phase arcs

McKay¹,

Partamies²,

Vierinen³

2018

Ann. Geophys.

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Abstract. The initial stage of a magnetospheric substorm is the growth phase, which typically lasts 1-2 h. During the growth phase, an equatorward moving, east-west extended, optical auroral arc is observed. This is called a growth-phase arc. This work aims to characterize the optical emission and riometer absorption signatures associated with growth-phase arcs of isolated substorms. This is done using simultaneous all-sky camera and imaging riometer observations. The optical and riometric observations allow determination of the location of the precipitation within growth-phase arcs of low-( < 10 keV) and high-(> 10 keV) energy electrons, respectively. The observations indicate that growth-phase arcs have the following characteristics:1. The peak of the cosmic noise absorption (CNA) arc is equatorward of the optical emission arc. This CNA is contained within the region of diffuse aurora on the equatorward side.2. Optical pulsating aurora are seen in the border region between the diffuse emission region on the equatorward side and the bright growth-phase arc on the poleward side. CNA is detected in the same region.3. There is no evidence of pulsations in the CNA.4. Once the equatorward drift starts, it proceeds at constant speed, with uniform separation between the growthphase arc and CNA of 40 ± 10 km.Optical pulsating aurora are known to be prominent in the post-onset phase of a substorm. The fact that pulsations are also seen in a fairly localized region during the growth phase shows that the substorm expansion-phase dynamics are not required to closely precede the pulsating aurora.

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All‐sky interferometric riometry

Cited by 4 publications

References 30 publications

Science goals for a high-frequency radar and radio imaging array

Science goals for a high-frequency radar and radio imaging array

Multi-static spatial and angular studies of polar mesospheric summer echoes combining MAARSY and KAIRA

Pulsating aurora and cosmic noise absorption associated with growth-phase arcs

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