
POES - Polar Operational Environmental Satellites
Spacecrafts NOAA POES (ex TIROS) project operates a constellation of weather low-gravitating satellites (850 km) in polar orbits (inclination 98 degrees) around the Earth. Each POES satellite completes roughly 14.1 orbits per day. Тhey regularly observed Space Environment Monitor (SEM). Satellites have a set of tools, for tracking energy charged particles in the vicinity around the Earth.
The two charts above represent the size and position of the oval of Aurora (northern lights) at both poles, extrapolated from measurements at the last crossing of the NOAA POES satellite over the pole.
Red arrow indicates the direction of the moon (lunar meridiyan). The level of activity of Aurora is presented by colors as described in the tape right to the charts, where one unit of the scale is equal to = 1 erg x cm-2 x sec-1.
Capacity and location of the northern lights in the northern hemisphere now.
Top graph shows the visibility of northern lights in the northern hemisphere. Observation is observed in the moonless sky and low ambient light.
On the chart, with bright colors depicts the polar activity, which is caused by solar wind. Hues ranging from green for very low, almost zero activity to brown/orange for medium, to red for high levels of activity. When the red color is brightly, activity is more intense.
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Source:
Space Weather Prediction Center @ NOAA.