Height and critical frequency variations of the sporadic-E layer at midlatitudes

Details Height and critical frequency variations of the sporadic-E layer at midlatitudes Height and critical frequency variations of the sporadic-E layer at midlatitudes

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jastp..70.1904s&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 70, Issue 15, p. 1904-1910.

Physics

1

Sporadic E, Planetary Waves, Tidal Waves, Mid-Latitude Ionosphere, Wavelet Transform

Scientific paper

The present study concerns variations in height and critical frequency of sporadic E layer over a wide period range of hours to several days, covering tidal and planetary oscillation domain. Besides periodicities in the tidal and planetary range that are known to occur within time series of critical frequencies (foEs) of sporadic-E layer [Pancheva, D., Haldoupis, C., Meek, C.E., Manson, A.H., Mitchell, N.J., 2003. Evidence of a role for modulated atmospheric tides in the dependence of sporadic E layers on planetary waves. Journal of Geophysical Research 108, Art. No. 1176; Haldoupis, C., Pancheva, D., Michell, N.J., 2004. A study of tidal and planetary wave periodicities present in midlatitude sporadic E layers. Journal of Geophysical Research 109, Art. No. A02302] among others, we evidence the existence of the 4-day planetary wave well developed in the height of sporadic E time serie (hEs). Moreover it is shown that the central-period of the diurnal tidal component of hEs is not exactly 24 h but it varies between 22 and 26 h at the planetary wave period. At a first glance, this is surprising since the origin of the diurnal tide is a forced oscillation with a 24 h period due to the Earth rotation and the periodic heating of the atmosphere by the Sun. Our interpretation is based on the perturbation of the height of the Es layer imposed by the planetary wave. In this mechanism the Es layer is moved up and down by the planetary wave producing a Doppler effect and resulting in a shift of the central-period around 24 h. With this interpretation, the excursion of the central-period is related to the vertical velocity perturbation of the Es layer due to the planetary wave. For a central period varying between 22 and 26 h the peturbation velocities are 0.026 and , respectively.

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