Long-period fluctuations of meteorological origin observed in the lower ionosphere

Details Long-period fluctuations of meteorological origin observed in the lower ionosphere Long-period fluctuations of meteorological origin observed in the lower ionosphere

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jatp...51..381p&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 51, May 1989, p. 381-388.

Physics

14

Atmospheric Attenuation, H Alpha Line, Lower Ionosphere, Lyman Alpha Radiation, Radio Attenuation, Radio Waves, Europe, Night Sky, Satellite Observation, Solar Flux, Solstices

Scientific paper

Application of a correloperiodogram analysis to day and night-time radio wave absorption values for five LF radio paths (164, 155, 185, 218, and 272 kHz) in central and southern Europe during the interval June 1, 1979 - June 30, 1980, fluctuations with the following quasi-periods were found: 2.3-3.2, 4-6, and 10.5-12 days. They exist in all the time series investigated. Other fluctuations with periods of 7-9 days are observed mainly in central Europe. Shorter period fluatuations are most active during the solstices and especially during winter, while the longer period fluctuations (10.5-12 days) have significant amplitudes also in spring. The analysis of satellite data on the intensity of ionizing solar H Lyman-alpha and X-ray (0.1-0.8 nm) radiation, of the variations of the geomagnetic activity and of lower thermospheric wind in central Europe, shows that the fluctuations observed in absorption are caused not by fluctuations in the solar ionizing flux, but probably by fluctuations in the neutral atmosphere. This could offer a possibility of monitoring fluctuations of the planetary wave period range in the upper mesosphere and lower thermosphere by means of radio-wave absorption measurements.

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