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Geomagnetic Pc1 Pearl Oscillations
May 6 , 2023
442 days
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- The Geomagnetic Pc1 pearl oscillations are amplitude-modulated structured narrow-band signals.
- They are signatures of low-frequency EMIC waves generated by resonant wave-particle interactions in the Earth’s magnetosphere.
- The observation of these oscillations is a proxy for the measurement of particle precipitation in the Earth’s magnetosphere.
- Evidences of these pulsations are abundant in the mid and high-latitude regions.
- At very low latitude stations, it is not frequent.
- These waves are an important component of space weather in the near-Earth environment.
- During the solar maximum period, the transmission rate of Pc1 waves to the equator was diminished than during the solar minimum.
- The annual and seasonal patterns of Pc1 occurrence showed an inverse relation with sunspot numbers at both stations.
- An association of these pulsations with active geomagnetic conditions showed the occurrence of Pc1 increasing significantly in the recovery phase of geomagnetic storms.
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