After days of suspenseful quiet, huge sunspot AR2665 finally erupted on July 14th (0209 UT), producing a powerful M2-class solar flare. Continue reading
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.
Visit Spaceweather.com for more information and updates.
(As seen on Southgate ARC)
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.
Check Spaceweather.com for more information and updates.
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)
At the end of October, a hole in the sun’s atmosphere lashed Earth’s magnetic field with solar wind, sparking moderately-strong geomagnetic storms and almost a full week of Arctic auroras. Continue reading