| 21. | The IRI is used to temporarily excite a limited area of the ionosphere.
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| 22. | Hence, most experiments on the ionosphere give only small pieces of information.
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| 23. | Higher frequencies do not reflect from the ionosphere, nor from storm clouds.
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| 24. | Skip distance is greatest during the night when the ionosphere is the highest.
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| 25. | This showed the ionosphere had a much more complex structure than first anticipated.
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| 26. | Among his accomplishments were his investigations into the ionosphere.
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| 27. | The upper boundary of the ionosphere ( ionopause ) is near 250 km.
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| 28. | Magnetic, ionosphere, ice and other observations are also carried out there.
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| 29. | J enters the Jovian ionosphere near the poles, closing the electrical circuit.
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| 30. | The ionosphere is mainly sustained by solar solar activity.
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