Key of abbreviations used by the Mauna Loa Observatory:

ADF -    Active dark filament
AFS -    Arch filament system
AP  -    Active Prominence
APR -    Active Prominence Region
AR  -    Active Region
ASR -    Active Surge Region
BOU -    Boulder, Colorado Observatory
BSD -    Bright surge on the disk
BSL -    Bright surge on the limb
CME -    Coronal Mass Ejection
CRN -    Coronal rain
DPMON -  Digital prominence monitor
DSD -    Dark surge on the disk
DSF -    Disappearing filament
EPL -    Eruptive prominence on the limb
MDP -    Mound prominence
MLSO -   Mauna Loa Solar Observatory
QP  -    Quiescent prominence
PA  -    Position angle (measured counterclockwise from north pole.
	 eg. east equator = 90 degrees, west equator = 270 degrees)
RV  -    Radius vector
UT  -    Universal Time
WL -     White light


NOTE:  (bracketed letters indicate observer's initials)