The winter anomaly as seen in the propagation of low frequency 40 kHz radio waves

Ishimine, T.; Echizenya, Y.

doi:10.1016/0021-9169(86)90042-5

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Vlf Phase and Lf Intensity Variations1

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1993

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“…From phase and field strength measurements of the 40 kHz (JG2AS) signals from Nazaki (36.2°N, 139.8°E) at Akita, ISHIMINE and ECHIZENYA (1986) found that on winter anomaly days the field strength minima appeared at both earlier times in the morning and later times in the evening. Such behavior for the 40 kHz field strength minima is also true for the unusual 10.2 kHz phase advances detected at Inubo, as shown in the top panel of Fig.…”

Section: Vlf Phase and Lf Intensity Variationsmentioning

confidence: 98%

Latitudinal Extent of the f-min Winter Anomaly Region during the DYANA Campaign.

Ohtani

Ogawa

Igarashi

1993

J. geomagn. geoelec

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The f -min data obtained at eight ionosonde stations in the Far East during the DYANA campaign in January 1990 is analyzed to investigate the latitudinal extent of the ionospheric D-region winter anomaly region. The f -min anomaly is most intensified around the geographic latitudes of 40-45°N, becomes weaker toward higher and lower latitudes, and on occasion extends down to 26°N. Anomalous VLF and LF radio wave propagations strongly suggest the existence of D-region electron density enhancements during the winter anomaly. We hypothesize that this anomaly is triggered by planetary wave activity in the stratosphere and mesosphere.

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Section: Vlf Phase and Lf Intensity Variationsmentioning

confidence: 98%