Studies of the Midlatitude and High Latitude Ionosphere from Millstone Hill during Solar Maximum Conditions by Evans, J. V., Holt, J. M., Oliver, W. L., Wand, R. H.

“…In particular, the nighttime trough frequently is found to appear first in mid-afternoon at latitudes where the ion drift is high and sunward. …”
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Millstone Hill Thomson Scatter Results for 1966 by Evans, J. V.

“…On four days in which pronounced effects due to geomagnetic storms are evident, the layer rose to great heights in the late afternoon and achieved an abnormally high density (and lower-than-normal temperature). …”
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Millstone Hill Thomson Scatter Results for 1967 by Evans, J. V.

“…This consists of an increase in density on the afternoon of the first day of the storm followed by a marked decrease the next morning. …”
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