12- hour plot of Boulder Magnetometer H- and D components

Period (UTC) 1200-1500 1500-1800 1800-2100 2100-0000
Value
K-index
H-trace
D-trace
K NT
4 66.0
3.5 30.0
4.8 66.0
K NT
4 58.0
3.6 33.0
4.6 58.0
K NT
3 27.0
3.2 24.0
3.3 27.0
K NT
4.1 45.0
4.1 45.0
3.0 20.0

12-hour Boulder-USGS Magnetometer Monitor
with 3-hourly K-Indices

Final Boulder K-indices are available at Geomagnetic and Solar indices and A/K Indices lists.

The geographic location of the Boulder-USGS geomagnetic observatory is N40.1 W105.2. Magnetometer values are the average of 60 1-second samples. The H component is directed along magnetic north, which is currently about 10 degrees east of geographic north. The D component is pointing 90 degrees clockwise relative to H. This is currently about 10 degrees south of geographic east. For more information see The K-index.

This page updates dynamically every minute.

NOAA / Space Weather Prediction Center