| 11. | Aircraft flying polar routes near the geomagnetic poles are at particular risk.
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| 12. | The frequency of geomagnetic storms increases and decreases with the sunspot cycle.
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| 13. | A geomagnetic storm has three phases : initial, main and recovery.
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| 14. | Transmitting and receiving stations should be nearly equidistant from the geomagnetic equator.
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| 15. | Effects on Schumann resonances have been reported following geomagnetic and ionospheric disturbances.
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| 16. | Skywave propagation is usually degraded sometimes seriously during geomagnetic storms.
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| 17. | The geomagnetic polarity time scale was calibrated largely using K Ar dating.
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| 18. | Brief disruptions that do not result in reversal are called geomagnetic excursions.
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| 19. | :Geomagnetic reversal # Future of the present field has some information.
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| 20. | A G4 ( severe ) geomagnetic storm was reported on September 26.
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