1. The spacecraft broadcast ionospheric model parameters, but some errors remain. 2. France contributed with Dumont d'Urville Station and ionospheric soundings. 3. ionospheric and propagation on 160 meters is still not completely understood.4. The measurement converts time delay to effective altitude of the ionospheric layer. 5. Later analysis of the ionospheric effects suggested increasing this estimate to X45. 6. Effects on Schumann resonances have been reported following geomagnetic and ionospheric disturbances. 7. Nowadays, ionospheric data is important when communications with satellites are considered. 8. PACE provided simultaneous conjugate studies of ionospheric and magnetospheric phenomena. 9. StarFire instead uses an advanced receiver to correct for ionospheric effects internally. 10. Arecibo also includes several NSF funded radars for ionospheric studies.
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