sharon sanders
Editor-in-Chief & President
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NOAA Space Weather - Warning of Geomagnetic K-index of 6 expected today 1:45 pm - 7:59 EDT - August 2, 2026
- Thread starter sharon sanders
- Start date
Commonground
Senior Moderator
SPACE WEATHER AND GPS SYSTEMS
The use of single and dual frequency satellite radio navigation systems, like the Global Positioning System (GPS), has grown dramatically in the last decade. GPS receivers are now in nearly every cell phone and in many automobiles, trucks, and any equipment that moves and needs precision location measurements. High precision dual frequency GPS systems are used for farming, construction, exploration, surveying, snow removal and many other applications critical to a functional society.
-snip-
In calm conditions, single frequency GPS systems can provide position information with an accuracy of a meter or less. During a severe space weather storm, these errors can increase to tens of meters or more. Dual frequency GPS systems can provide position information accurate to a few centimeters. In this case the two different GPS signals are used to better characterize the ionosphere and remove its impact on the position calculation. But when the ionosphere becomes highly disturbed, the GPS receiver cannot lock on the satellite signal and position information becomes inaccurate...
ELECTRIC POWER TRANSMISSION
The electric power grid, and consequently the power to your home and business, can be disrupted by space weather. One of the great discoveries of the 19th century was the realization that a time-varying magnetic field is able to produce an electrical current in a conducting wire. The basic idea is that the time rate of change of the magnetic flux (i.e. lines of magnetic force) passing through a current loop is proportional to the current that is generated around the loop.
-snip-
Assessing the impact of geomagnetic storms on the electrical power grid involves a number of considerations....
HF RADIO COMMUNICATIONS
Space weather impacts radio communication in a number of ways. At frequencies in the 1 to 30 mega Hertz range (known as “High Frequency” or HF radio), the changes in ionospheric density and structure modify the transmission path and even block transmission of HF radio signals completely. These frequencies are used by amateur (ham) radio operators and many industries such as commercial airlines. They are also used by a number of government agencies such as the Federal Emergency Management Agency and the Department of Defense.
-snip-
SATELLITE COMMUNICATIONS
Satellite communication refers to any communication link that involves the use of an artificial satellite in its propagation path. Satellite communications play a vital role in modern life. There are over 2000 artificial satellites in use. They can be found in geostationary, Molniya, elliptical, and low Earth orbits and are used for traditional point-to-point communications, mobile applications, and the distribution of TV and radio programs.
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https://www.spaceweather.gov/products/planetary-k-index
Commonground
Senior Moderator
NOAA ALERTS, WATCHES AND WARNINGS
Space Weather Message Code: ALTK06
Serial Number: 724
Issue Time: 2026 Aug 02 1800 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Aug 02 1759 UTC
Synoptic Period: 1500-1800
Active Warning: YES
Noaa Scale: G2 - Moderate
Comment:
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at...
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
--------------------------------------------------------------------------------
Space Weather Message Code: WARK06
Serial Number: 668
Issue Time: 2026 Aug 02 1746 UTC
WARNING: Geomagnetic K-index of 6 expected
Valid From: 2026 Aug 02 1745 UTC
Valid To: 2026 Aug 02 2359 UTC
Warning Conditions: Onset
Noaa Scale: G2 - Moderate
Comment:
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at ...
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
...https://www.spaceweather.gov/products/alerts-watches-and-warnings
Space Weather Message Code: ALTK06
Serial Number: 724
Issue Time: 2026 Aug 02 1800 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Aug 02 1759 UTC
Synoptic Period: 1500-1800
Active Warning: YES
Noaa Scale: G2 - Moderate
Comment:
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at...
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
--------------------------------------------------------------------------------
Space Weather Message Code: WARK06
Serial Number: 668
Issue Time: 2026 Aug 02 1746 UTC
WARNING: Geomagnetic K-index of 6 expected
Valid From: 2026 Aug 02 1745 UTC
Valid To: 2026 Aug 02 2359 UTC
Warning Conditions: Onset
Noaa Scale: G2 - Moderate
Comment:
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at ...
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
...https://www.spaceweather.gov/products/alerts-watches-and-warnings
Commonground
Senior Moderator
Aug 02 2026
G2 Geomagnetic Storm Hits as Forecast: Radio Signatures Caught What M1.9 Label Missed
Excerpt:
What does a G2 geomagnetic storm actually do to infrastructure?
... High-frequency radio propagation fades at higher latitudes, affecting polar aviation communications. GPS receivers experience marginally reduced accuracy. The effects are manageable with warning time — which the NOAA SWPC watch provided more than 40 hours before arrival — but they are real and require active response from infrastructure operators, not just skywatchers.
...https://www.techtimes.com/articles/...o-signatures-caught-what-m19-label-missed.htm
G2 Geomagnetic Storm Hits as Forecast: Radio Signatures Caught What M1.9 Label Missed
Excerpt:
What does a G2 geomagnetic storm actually do to infrastructure?
... High-frequency radio propagation fades at higher latitudes, affecting polar aviation communications. GPS receivers experience marginally reduced accuracy. The effects are manageable with warning time — which the NOAA SWPC watch provided more than 40 hours before arrival — but they are real and require active response from infrastructure operators, not just skywatchers.
...https://www.techtimes.com/articles/...o-signatures-caught-what-m19-label-missed.htm