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

Period (UTC) 0000-0300 0300-0600 0600-0900 0900-1200
Value
K-index
H-trace
D-trace
K NT
1 7.0
1.4 7.0
1.0 5.0
K NT
0 4.0
0.6 3.0
0.8 4.0
K NT
0 4.0
0.6 3.0
0.8 4.0
K NT
0.6 3.0
0.6 3.0
0.6 3.0

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