Characteristics of quasi-2-day oscillations in the f(sub 0)F2 at northern middle latitudes

Details Characteristics of quasi-2-day oscillations in the f(sub 0)F2 at northern middle latitudes Characteristics of quasi-2-day oscillations in the f(sub 0)F2 at northern middle latitudes

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...10012163a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 100, no. A7, p. 12,163-12,171

Physics

Geophysics

35

Geophysics, Middle Atmosphere, Oscillations, Planetary Waves, Geomagnetism, Plasma Drift, Solar Cycles, Zonal Flow (Meteorology)

Scientific paper

The temporal variations of the characteristics of f(sub 0)F2 quasi-2-day oscillations at middle latitudes in the northern hemisphere are investigated. The hourly data for the period 1976-1986 for four European ionospheric stations, Kiev (50.5 deg N, 30.5 deg E), Kaliningrad (54.7 deg N, 20.62 deg E), Lannion (48.75 deg N, 3.45 deg W) and Slough (51.48 deg N, 0.57 deg W), are used for analysis. Periodogram and complex demodulation analysis are used to evaluate the period and amplitude time variations of this oscillation. It is found that quasi-2-day oscillations in f(sub 0)F2 are present almost continuously during the year. The amplitude is larger in the equinoxes and lower in the solstices. The amplitude variations are modulated by the long-term geomagnetic variations during the solar cycle. There is a clear expressed seasonal variation of the oscillation period with minimum in the winter, November-February (42-47 hours), and maximum near summer solstice (48-55 hours). The observations suggest that there are three types of f(sub 0)F2 quasi-2-day oscillations with behavior of (1) westward traveling planetary wave with zonal number one, predominantly during summer half year, with greatest occurrence in August, (2) stationary planetary wave with a maximum occurrence in the summer solstice with unknown wave number, and (3) independent oscillations in separate locations on relatively long distances. The vertical plasma drift variations can explain the annual and long-term modulation effects of f(sub 0)F2 quasi-2-day amplitude variations but encounter significant difficulties in explaining the discrepancy between zonal wave numbers in the mesosphere (three) and upper ionosphere (one). Another possibility is that the arising of quasi-2-day oscillation in the upper ionosphere may be induced by the forcing of such oscillation in the mesosphere with further independent development in the F region.

Affiliated with

Also associated with

No associations

Rating

Characteristics of quasi-2-day oscillations in the f(sub 0)F2 at northern middle latitudes does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Characteristics of quasi-2-day oscillations in the f(sub 0)F2 at northern middle latitudes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Characteristics of quasi-2-day oscillations in the f(sub 0)F2 at northern middle latitudes will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1173437