:Product: Geophysical Alert Message wwv.txt
:Issued: 2023 Jun 05 1805 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Geophysical Alert Message
Solar-terrestrial indices for 04 June follow.
Solar flux 168 and estimated planetary A-index 10.
The estimated planetary K-index at 1800 UTC on 05 June was 0.67.

No space weather storms were observed for the past 24 hours.

No space weather storms are predicted for the next 24 hours.

NOAA Alerts

Space Weather Message Code: ALTK04
Serial Number: 2377
Issue Time: 2023 Jun 04 2102 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2023 Jun 04 2059 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

NOAA Observations


NOAA Scales Activity

NOAA Scales Activity
Range 1 (minor) to 5 (extreme)
NOAA Scale Past 24 hrs Current Fcst 24 hrs
Geomagnetic Storms
Solar Radiation Storms
Radio Blackouts

DX Cluster WWV announcements

0900AE5ESFI=84, A=5, K=0, No Storms -> No Storms
0900VE1DXSFI=91, A=4, K=0, No Storms -> No Storms
0900VE7CCSFI=87, A=5, K=3, No Storms -> Minor w/G1
0900VE1DXSFI=80, A=6, K=0, No Storms -> No Storms
0900AE5ESFI=143, A=4, K=1, Minor w/R1 -> Minor w/R1

Propagation Links

Sunrise/Sunset tables by NOAA
Sunrise/Sunset by U.S. Naval Observatory
3-Day Forecast of Space Weather Conditions
NOAA Geomagnetic Field Synthesis Program
Computes the estimated values of Earth's magnetic field, including magnetic declination (D), based on the current International Geomagnetic Reference Field (IGRF).
CT1BOH Propagation Page
N6RT Propagation Information
The Solar and Heliospheric Observatory
Current Solar Images
Ionosphere Data Archived at National Geophysical Data Center (NGDC)
High Frequency Active Auroral Research Program
HAARP is a scientific endeavor aimed at studying the properties and behavior of the ionosphere, with particular emphasis on being able to understand and use it to enhance communications.
AD5Q Propagation Forecast Archive
Eleven years of propagation reports from February 1988 to January 1999 focused on DX openings from North America.
Solar Terrestrial Physics
Data from Earth's upper atmosphere and space environment to the surface of the Sun, and Earth observations from space.
The Aurora Page
Information, links and images about the "Northern Lights".