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Table 2

Statistically dominant density-perturbing mechanisms associated with geomagnetic activity during the hours of 4–7 MLTa.

    70°–90° 90°–110° 110°–140°
60°–65° E A A
    55°–60° E A (MLT 4–5)/E (MLT 5–7) A
50°–55° E E E
45°–50° N N N

SZA: solar zenith angle; λm: magnetic latitude; MLT: magnetic local time; A: auroral electron precipitation; E: incremental penetration electric field; N: change in the neutral density profiles, presumably an increase in the neutral scale heights due to equatorward neutral wind during the occurrence of aurora.

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