4 ms·
ref also info about Coronal Holes: https://www.swpc.noaa.gov/phenomena/coronal-holes https://www.swpc.noaa.gov/phenomena/coronal-holes
by uticus 3y ago
ref also info about Coronal Holes: https://www.swpc.noaa.gov/phenomena/coronal-holes https://www.swpc.noaa.gov/phenomena/coronal-holes