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