UABSE Codes
Ionospheric absorption measurement by riometer technique or by ionospheric forward scatter or by VLF recordings.
Example:
Definition of symbols:
- UABSE comes from ionospheric ABSorption, codeE
- I I I I I = station indicator
- DD = UT day of observation
- T = type of measurement
-
- 1 = riometer
- 2 = forward scatter
- 3 = VLF phase advance (rarely retardation which requires use of group dddHH instead of group ccXHH
- HH = UT hour of message
- a = type of phenomenon
-
- 1 = SCNA (sudden cosmic noise absorption) (if it is associated with a solar flare, it is normally reported by code USIDO)
- 2 = SPA (sudden phase anomaly) (if it is associated with a solar flare, it may be reported by code USIDO)
- 3 = Aurora-associated absorption
- 4 = PCA (polar cap absorption event) due to protons
- 5 = PCA (polar cap absorption event) due to relativistic electrons
- 6 = noise storm of solar radio emission superposed on absorption
- 7 = slowly varying ionospheric absorption-defines onset time of magnetospheric sub-storm at auroral zone stations near the midnight meridian (Eather and Jacka, Australia J. Physics 19, 215, 1966).
- HHmm = UT hour and minute of beginning of phenomenon
- 9 = indicates time of maximum follows
- HHmm = UT hour and minute of maximum of event
Note: Omit group bHHmm if maximum time is not known
- If T = 1 or 2 in DDTHH use the following group:
- cc = number of decibels of maximum absorption before hour indicated by next HH
- / = filler
- HH = UT hour of end time of event (if the event is still in progress at the time of the message, use / /)
- If T = 3 in DDTHH use the following group:
- d d d = phase advance (rarely retardation) in degrees
- HH = UT hour of end time of event (if the event is still in progress at the time of the message, use / /)
Note: / is to be used for data not available.