The characteristics of VHF echoes from the summer mesopause region at mid-latitudes

L. Thomas; I. Astin; I. T. Prichard

doi:10.1016/0021-9169(92)90063-Q

The characteristics of VHF echoes from the summer mesopause region at mid-latitudes

L. Thomas, I. Astin, I. T. Prichard

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Abstract

Radar observations have been carried out at Aberystwyth (52.4°N, 4.1°W) during the period May-August 1990 to search for echoes analogous to the Polar Mesosphere Summer Echoes commonly observed at high latitudes. Signal strength measurements in the vertical and at 12° from the vertical are used to examine the aspect sensitivity of echoes, and Doppler measurements at 6° from the vertical and in the vertical to estimate wind velocities. The observations show the presence of two types of moderately strong echoes from heights above 80 km. On most days a spectrally broad echo is observed with characteristics consistent with isotropic turbulence scatter. On certain days between mid-June and mid-July, stronger spectrally narrow echoes are observed with characteristics similar to Polar Mesosphere Summer Echoes.

Original language	English
Pages (from-to)	969-977
Number of pages	9
Journal	Journal of Atmospheric and Terrestrial Physics
Volume	54
Issue number	7-8
DOIs	https://doi.org/10.1016/0021-9169(92)90063-Q
Publication status	Published - 1 Jan 1992

ASJC Scopus subject areas

Environmental Science(all)
Engineering(all)
Geophysics
Atmospheric Science
Earth and Planetary Sciences(all)

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abstract = "Radar observations have been carried out at Aberystwyth (52.4°N, 4.1°W) during the period May-August 1990 to search for echoes analogous to the Polar Mesosphere Summer Echoes commonly observed at high latitudes. Signal strength measurements in the vertical and at 12° from the vertical are used to examine the aspect sensitivity of echoes, and Doppler measurements at 6° from the vertical and in the vertical to estimate wind velocities. The observations show the presence of two types of moderately strong echoes from heights above 80 km. On most days a spectrally broad echo is observed with characteristics consistent with isotropic turbulence scatter. On certain days between mid-June and mid-July, stronger spectrally narrow echoes are observed with characteristics similar to Polar Mesosphere Summer Echoes.",

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T1 - The characteristics of VHF echoes from the summer mesopause region at mid-latitudes

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AU - Astin, I.

AU - Prichard, I. T.

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Y1 - 1992/1/1

N2 - Radar observations have been carried out at Aberystwyth (52.4°N, 4.1°W) during the period May-August 1990 to search for echoes analogous to the Polar Mesosphere Summer Echoes commonly observed at high latitudes. Signal strength measurements in the vertical and at 12° from the vertical are used to examine the aspect sensitivity of echoes, and Doppler measurements at 6° from the vertical and in the vertical to estimate wind velocities. The observations show the presence of two types of moderately strong echoes from heights above 80 km. On most days a spectrally broad echo is observed with characteristics consistent with isotropic turbulence scatter. On certain days between mid-June and mid-July, stronger spectrally narrow echoes are observed with characteristics similar to Polar Mesosphere Summer Echoes.

AB - Radar observations have been carried out at Aberystwyth (52.4°N, 4.1°W) during the period May-August 1990 to search for echoes analogous to the Polar Mesosphere Summer Echoes commonly observed at high latitudes. Signal strength measurements in the vertical and at 12° from the vertical are used to examine the aspect sensitivity of echoes, and Doppler measurements at 6° from the vertical and in the vertical to estimate wind velocities. The observations show the presence of two types of moderately strong echoes from heights above 80 km. On most days a spectrally broad echo is observed with characteristics consistent with isotropic turbulence scatter. On certain days between mid-June and mid-July, stronger spectrally narrow echoes are observed with characteristics similar to Polar Mesosphere Summer Echoes.

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The characteristics of VHF echoes from the summer mesopause region at mid-latitudes

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