NOAA Logo

NWS Logo

Organizations

Space Weather Prediction Center

National Oceanic and Atmospheric Administration

Sunday, January 21, 2018 08:29:26

Main menu

NOAA Scales mini

minimize icon
Space Weather Conditions
24-Hour Observed Maximums
R
no data
S
no data
G
no data
Latest Observed
R
no data
S
no data
G
no data
R1-R2 --
R3-R5 --
S1 or greater --
G
no data
R1-R2 --
R3-R5 --
S1 or greater --
G
no data
R1-R2 --
R3-R5 --
S1 or greater --
G
no data
maximize icon
R
no data
S
no data
G
no data
Current Space Weather Conditions
R1 (Minor) Radio Blackout Impacts
close
HF Radio: Weak or minor degradation of HF radio communication on sunlit side, occasional loss of radio contact.
Navigation: Low-frequency navigation signals degraded for brief intervals.
More about the NOAA Space Weather Scales

G1 (Minor) Geomagnetic Storming Conditions Continue

G1 (Minor) storming Watch and Warning out for 14-15 Dec
G1 (Minor) Geomagnetic Storming Conditions Continue
published: Tuesday, December 15, 2015 12:21 UTC

A G1 (Minor) geomagnetic storm warning was issued on 14 December at 1724 UTC (1224 ET) and remains valid until 15 December at 0400 UTC (14 Dec, 2300 ET). In relation to this warning, a G1 Watch was issued for 15 December. A co-rotating interaction region ahead of an expected negative polarity coronal hole high speed stream (CH HSS), arrived early and led to a disturbance in the Interplanetary Magnetic Field (IMF) strength and increasing solar wind speeds due to the CH HSS. Isolated periods of southward orientated Bz component has led to increased geomagnetic responses; including the G1 levels reached at 1759 UTC (1229 ET) and again at 2201 UTC (1701 ET). Any subsequent occasions of prolonged southward Bz component is expected to result in periods of G1 storming through the warning period. Since the CH HSS is expected to impact Earth's geomagnetic field for approximately 24 hours (through 15 Dec), the G1 Watch for 16 December has been dropped.