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The response of atmospheric radio noise on 27 kHz to long-term solar variability

 
: Schaning, B.

Zeitschrift für Meteorologie 38 (1988), Nr.2, S.99-102
ISSN: 0084-5361
Englisch
Zeitschriftenaufsatz
Fraunhofer HHI ()
atmospherics; d-region; ionospheric electromagnetic wave propagation; radiowave propagation; solar activity; solar-terrestrial relationships; thunderstorms; east germany; atmosphere; solar terrestrial relationship; radiowave; vlf; ad 1952 to 1986; atmospheric radio noise; long-term solar variability; field strength; observatory of kuhlungsborn; monthly anomalies; euv; uv activity; attenuation rate; equinoxes; winter; propagation; distance atmospheric noise-generating sources; nearby thunderstorms; summer; temperatures; europe; seasons; 850 hpa; 27 khz

Abstract
35 years of monthly median values of the atmospheric radio noise field strength on 27 kHz, measured at the Observatory of Kuhlungsborn, are analysed to determine the monthly anomalies and to test their persistence and response to long-term solar variability. In accordance with the known relation between the influence of solar EUV and UV activity and the attenuation rate of the D-region, a significant dependence of the anomalies on solar activity was obtained for equinoxes and the winter due to the dominant role of the conditions of propagation to the distance atmospheric noise-generating sources. The frequent occurrence of nearby thunderstorms gives rise to the anomalies in summer, which does not respond to the long-term solar variability. Instead, a significant correlation was found between the anomalies in July and the monthly median values of the 850-hPa temperatures of 5 to 9 stations in Central Europe. The numerical response of the atmospheric radio-noise level to solar variability can be estimated by means of linear equations for different seasons.

: http://publica.fraunhofer.de/dokumente/N-13905.html