nCalculation
1.Pick up  geomagnetic meridian data.
2.Estimate the distance until the aurora using a peak of 557.7 emission.
3.Obtain altitude profile of N2+ emission.
Estimation of altitude profile
Assumption
1.557.7nm and 427.8nm are emitted at same magnetic field line.
2.The peak of 557.7nm emission is 110km.
①
110km
②
③
Θpeak
B