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auroral ionosphere
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ionosphere
ADVANCED-COMPOSITION-EXPLORER
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AURORAL FORMS
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AURORAL-ZONE CURRENTS
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CONVECTION
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DAYSIDE MAGNETOPAUSE
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FEATURES
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FINLAND RADAR
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HF RADAR
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HF RADAR OBSERVATIONS
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MAGNETIC-FIELD
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TWO-DIMENSIONAL OBSERVATIONS
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WESTWARD TRAVELING SURGE
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cusp and boundary layers
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