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Equinox (left) and solstice (right) noontime electron temperatures versus invdip latitude at 550 km for three levels of solar activity (blue, low, PF10.7 < 110; green, medium, 110 < PF10.7 < 180; red, high, PF10.7 > 180). Data shown are from satellite in situ measurements giving the median plus upper and lower quartiles. Np is total number of measurements for each curve.
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