<AUR>.Solar Wind Arrival

Solar Wind Arrival parameters

(white vertical line indicates conditions @30 RE)

Theta or Beta??

There NOAA explains:

(theta) = cos-1(BZ/B)

So,  (BZ/B) can have values between -1 and 1, that means Theta can have a values between 0deg and 180deg..

(0deg if (BZ/B) = 1; 90deg if (BZ/B) = 0; 180deg if (BZ/B) = -1)


On the chart above Theta has values between -90deg and 90deg  – it seems to be a Beta..

(beta) = 90 – theta degrees


Looks like a bug?