Across
- 3. all ___ operations are IFR
- 4. the interplanetary magnetic field extends beyond ___
- 9. lunar phase between 51% and 99%
- 14. SIDs are ___ in incoming solar radiation
- 15. gibbous phase that is losing light but is more than half illuminated
- 16. cycle that takes 29.5 nights
- 17. max ionospheric storm duration
- 19. crescent phase that is also called first quarter
- 20. explosion on sun's surface
Down
- 1. airfield ___ is based on the primary aircraft assigned to the airfield
- 2. clear skies are ___ for NVDs
- 5. twilight where illumination is sufficient for terrestrial objects to be clearly distinguished
- 6. ceilings 1000 to 3000 ft AGL
- 7. what exceeds sunlight and light from other natural sources during astronomical twilight
- 8. ___rise and ___set when the upper edge of sun’s disk is on the horizon
- 10. weakest geomagnetic storm intensity
- 11. aurora in the southern hemisphere
- 12. ___ meteorological conditions where ceiling and visibility equal to or better than specified minima
- 13. nautical twilight angle below horizon
- 18. upper limit of usable frequency