Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10703978 | Journal of Atmospheric and Solar-Terrestrial Physics | 2005 | 9 Pages |
Abstract
Reliable long distance RF communication and transionospheric radio links depend critically on space weather, and specifically ionospheric conditions. Modern ground-based ionosondes provide space weather parameters in real-time including the vertical electron density distribution up to â¼1000Â km and the velocity components of the ionospheric F region drift. A global network of digisondes distributes this information in real-time via internet connections. The quality of the automatic scaling of the echo traces in ionograms was a continuous concern ever since first attempts have been reported. The modern low-power ionosonde with â¼100Â W transmitters (compared to several kilowatt for the older ionosondes) relies on more sophisticated signal processing to enhance the signal-to-noise ratio and to retrieve the essential ionospheric characteristics. Recent advances in the automatic scaling algorithm ARTIST have significantly increased the reliability of the autoscaled data, making the data, in combination with models, more useful for ionospheric now-casting. Vertical and horizontal F region drift velocities are a new real-time output of the digisondes. The “ionosonde drift” is derived from the measured Doppler frequency shift and angle of arrival of ionospherically reflected HF echoes, a method similar to that used by coherent VHF and incoherent scatter radars.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Geophysics
Authors
B.W. Reinisch, X. Huang, I.A. Galkin, V. Paznukhov, A. Kozlov,