CURRENT PROPAGATION CONDITIONS.: Solar-terrestrial indices for 26 March follow. Solar flux 77 and estimated planetary A-index 4. The estimated planetary K-index at 2100 UTC on 26 March was 1. No space weather storms were observed for the past 24 hours. Space weather for the next 24 hours is predicted to be minor. Geomagnetic storms reaching the G1 level are likely.

ALERT CONDITION: WHISKY ( WHITE )

Sunday, March 26, 2017 - 22:46 GMT - UPDATE # 46

OPERATIONAL FORECAST. - GEOMAGNETIC FIELD. The geomagnetic field is expected to reflect the onset of a CIR with active conditions late on day one (26 Mar). G1 (Minor) geomagnetic storm levels are likely on day two and three (27-28 Mar), with isolated G2 (Moderate) conditions likely on day three (28 Mar), in response to the influence of a negative polarity CH HSS that is expected to be be persistently strong. .- SOLAR ACTIVITY. Solar activity is expected to continue at very low levels throughout the forecast period (26-28 Mar).

G/S/R SCALES USED     DEF'S USED     LIGHTNING - (QRN)


HF OPERATIONAL BRIEFING - CURRENT CONDITIONS IN DETAIL

CURRENT SOLAR CONDITIONS


VISIBLE DISK

 


SOLAR MAGNETOGRAM

 


NEAR INFRARED

 


SUNSPOT TRACKING

 

Solar activity was very low. Newly emerged Region 2644 (N13E36, Dro/beta) produced a few B-class x-ray enhancements. Region 2643 (N08E10, Axx/alpha) continued its slow decaying trend. No Earth-directed CMEs were observed in available coronagraph imagery.


RADIO BLACKOUTS - SOLAR STORMS - GEOMAGNETIC STORMS

The geomagnetic field was quiet under a nominal solar wind regime.


"D" LAYER - HF ATTENUATION LEVELS


AURORA  -   NORTH POLE  - SHORT PATH