A review of results of the international ionospheric Doppler sounder network

0478392 - ÚFA 2018 RIV GB eng J - Článek v odborném periodiku
Laštovička, Jan - Chum, Jaroslav
A review of results of the international ionospheric Doppler sounder network.
Advances in Space Research. Roč. 60, č. 8 (2017), s. 1629-1643. ISSN 0273-1177. E-ISSN 1879-1948
Grant CEP: GA ČR(CZ) GC15-07281J
Institucionální podpora: RVO:68378289
Klíčová slova: ionospheric Doppler shift sounding * gravity waves * infrasound * solar forcing
Obor OECD: Meteorology and atmospheric sciences
Impakt faktor: 1.529, rok: 2017
http://www.sciencedirect.com/science/article/pii/S0273117717300790?via%3Dihub

This paper summarizes main recent results reached by the Czech-lead international network of ionospheric Doppler shift sounders.
The network consists of Doppler sounders in the western half of Czechia (5 measuring paths, 3 frequencies with central receivers in Prague),
northern Taiwan (3 transmitters, two separated receivers, 1 frequency), and two similar systems (3 measuring paths with 1 receiver
and 1 frequency) in Tucuman (north-western Argentina) and Hermanus (the southernmost South Africa). Main areas of research have
been: (1) propagation of gravity waves (2) ionospheric effects of earthquakes (3) low latitude/equatorial phenomena (4) ionospheric
response to strong meteorological phenomena (5) effects of solar flares, geomagnetic activity and geomagnetic micropulsations. Main
results: (1) Theoretically expected dominance of gravity wave propagation against wind has been confirmed. (2) Impact of a train of seismic
waves (P, S, SS, Rayleigh) generated by the Tohoku 2011 M9.0 earthquake was registered in the ionosphere over the Czech Republic
as long-period infrasound at the distance of about 9000 km from epicenter. (3) Analysis of ionospheric infrasound excited by the Nepal
2015 M7.8 earthquake observed by the Czech and Taiwan Doppler sounders showed that the intensity of ionospheric signal is signifi-
cantly height and latitude dependent. Air/plasma compression has to be considered to compute air particle velocities from the observed
Doppler shift. (4) Nonlinear effects result in formation of N-shaped pulse disturbance in the upper atmosphere/ionosphere above strong
earthquakes as was documented by the example of the M8.3 Illapel 2016 earthquake. (5) Spread F structures observed by Doppler sounders
in Tucuman and Taiwan (both under the crest of equatorial ionization anomaly) provide results consistent with S4 scintillation data
and with previous optical, GPS and satellite
Trvalý link: http://hdl.handle.net/11104/0274514