|Hello to the beautiful sky lit up by the dawning sun|
Geomagnetic Disturbance, Space Weather Update - September 24th, 2014:
"ACE Solar Wind telemetry shows that the speed (yellow) is around 400 km/s, while the density (orange) is between 5 to 6 protons/cm^3 as of 07:16 UTC this morning. The Bz (red component) of the Earth's magnetic field has been tipping South since 22:00 UTC last night; this Southward Bz, with a max of -7, has been a factor in the current Geomagnetic Disturbance. According to NOAA's forecast discussion we're also "under the influence of a positive polarity coronal hole high speed stream (CH HSS)."
Dr. Tony Phillips, of SpaceWeather.com, is reporting on the Southward Bz and:
"GEOMAGNETIC UNREST: Today, the interplanetary magnetic field (IMF) near Earth is tilting south, not much, but enough to open a crack in Earth's magnetosphere. Solar wind is pouring through the opening to fuel beautiful polar auroras. NOAA forecasters estimate a 40% chance that a full-fledged geomagnetic storm could develop in the next 24 hours. Aurora alerts: text, voice…" Read, See More: http://www.spaceweather.com/archive.php?view=1&day=24&month=09&year=2014
X-ray Solar Flares
A solar flare is an explosion on the Sun that happens when energy stored in twisted magnetic fields (usually above sunspots) is suddenly released. Flares produce a burst of radiation across the electromagnetic spectrum, from radio waves to x-rays and gamma-rays. [more information]
Scientists classify solar flares according to their x-ray brightness in the wavelength range 1 to 8 Angstroms.
There are 3 categories of x-ray solar flares:
X-class flares are big; they are major events that can trigger planet-wide radio blackouts and long-lasting radiation storms.
M-class flares are medium-sized; they can cause brief radio blackouts that affect Earth's polar regions. Minor radiation storms sometimes follow an M-class flare. Compared to X- and M-class events,
C-class flares are small with few noticeable consequences here on Earth.