Eclipse ISR observations underway

The Millstone Hill ISR operations radar has now been operating already for a few days in anticipation of the eclipse. The realtime analysis can be viewed on madrigal. Here's a plot of enhanced plasma-lines:

Plasma-line power. x-axis is time and y-axis is Doppler shift. The color indicates plasma-line power. At sunset, photoelectrons go away and during the night, be enhanced plasma-lines are seen.