Geomagnetic storm in progress


A minor G1-class geomagnetic storm is in progress on May 5th as Earth enters a stream of fast-moving solar wind. Continue reading


Geomagnetic storm predicted

NOAA forecasters say there is a 50% chance of G1-class geomagnetic storms on Jan. 1st when a high-speed stream of solar wind engulfs Earth’s magnetic field.

G1 storms are relatively minor, having little effect on satellites and power grids. However, they can spark intense auroras around the Arctic Circle and may disorient animals that use magnetic cues for navigation at high latitudes.

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(As seen on Southgate ARC)teur

Geomagnetic storms likely this week

A large hole has opened in the sun’s atmosphere, and it is spewing a stream of solar wind toward Earth. Estimated time of arrival: Oct. 24th.

First contact with the gaseous material is expected to produce minor G1-class geomagnetic storms, intensifying to moderately strong G2-class storms on Oct. 25th as Earth moves deeper into the stream.

Arctic sky watchers can expect to witness bright auroras. The lights could descend to lower latitudes as well, with sightings in northern-tier US states along a line from Maine to Washington.

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As seen on Southgate ARC

A hole in the Sun’s atmosphere turns toward Earth

Spewing a stream of solar wind as fast as 700 km/s (1.6 million mph), a hole in the sun’s atmosphere is turning toward Earth.

Forecasters expect the stream to reach our planet on June 15th or 16th with a 40% chance of minor G1-class geomagnetic storms when it arrives.

High-latitude sky watchers should be alert for auroras in the nights ahead, especially in the southern hemisphere where deepening autumn darkness favors visibility.

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(As seen on Southgate ARC)

Geomagnetic storm underway

A moderately strong G2-class geomagnetic storm is underway on May 27-28 as Earth moves through the wake of a CME that swept past our planet just hours ago.

High-latitude sky watchers should be alert for auroras, especially in the southern hemisphere where deepening autumn darkness favors visibility.

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Geomagnetic Storm Watch Remains in Effect

NOAA’s Space Weather Prediction Center (SWPC) says a minor (G1) geomagnetic storm watch remains in effect for April 24-26, due to the continued influence of a large, recurrent, negative-polarity coronal hole high-speed stream (CH HSS). A coronal hole is an area of the Sun where the magnetic field folds back, and solar wind escapes. This follows on the heels of an unexpected coronal mass ejection (CME) impact on April 22.

Conditions on HF are no better than fair, with conditions on the higher bands (17 through 10 meters) deemed poor. A G1 warning had been in effect until 1500 UTC today.

The odds of a G1 storm are 50-50. The upside is that the CH HSS increases the chances of auroral displays at lower-than-typical latitudes. NOAA says migratory animals are affected at the G1 and higher levels, and aurora is commonly visible at high latitudes (northern Michigan and Maine).

A G1 storm can cause weak power grid fluctuations and possibly impact satellite operations. According to NOAA, during storms, the currents in the ionosphere, as well as the energetic particles that precipitate into the ionosphere, add energy in the form of heat. This can increase the density and distribution of density in the upper atmosphere, causing extra drag on satellites in low-Earth orbit.

The local heating also creates strong horizontal variations in the ionospheric density, which can modify the path of radio signals and cause GPS errors. Geomagnetic storms can generate harmful geomagnetic induced currents (GICs) in the power grid and in pipelines.

(As seen from the ARRL news section)