ALERT: Geomagnetic K-index of 8
Threshold Reached: 2017 Sep 08 0151 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G4 – Severe
The NOAA Space Weather Scales were introduced as a way to communicate to the general public the current and future space weather conditions and their possible effects on people and systems.
Many of the Space Weather Prediction Center (SWPC) products describe the space environment, but few have described the effects that can be experienced as the result of environmental disturbances.
These scales are useful to users of our products and those who are interested in space weather effects. The scales describe the environmental disturbances for three event types: geomagnetic storms, solar radiation storms, and radio blackouts.
The scales have numbered levels, analogous to hurricanes, tornadoes, and earthquakesthat convey severity. They list possible effects at each level. They also show how often such events happen, and give a measure of the intensity of the physical causes.
The present storm is classified as G4 – SEVERE
Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude.
Induced Currents – Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify.
Spacecraft – Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur.
Navigation – Satellite navigation (GPS) degraded or inoperable for hours.
Radio – HF (high frequency) radio propagation sporadic or blacked out.
Aurora – Aurora may be seen as low as Alabama and northern California.
"Due to a particularly strong solar flare causing the northern lights, NASA has extended its geomagnetic storm watch through early Saturday. The lights are likely to be seen as far south as the Southern Tier, NASA said.
This solar flare is particularly intense, meaning the light show extends farther south than normal. NASA rates it as a G4, or SEVERE, geomagnetic storm. When that energy hits the earth's poles, it causes the electromagnetic show known as the northern lights"….
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