DRAC means SOI
Solar Oscillations Investigation/ MDI
Michelson Doppler Imager Data Reduction and Analysis Center in
NASA
Similar to DRAC
AC - Assembly Complete
ACBM - Active Common Berthing Mechanism
ACC - Aft Cargo Carrier
ACCA - Automatic Cloud Cover Assessment
ACCMS - Advanced Checkout, Control, and Maintenance System
ACCS - Advanced Checkout and Control System
ACE - Advanced Composition Explorer
View all in NASA