FORECAST SOL: Normal green MAG: Normal green ION: Normal green
SDO solar image - 193 angstroms - Courtesy of NASA/SDO and the AIA, EVE, and HMI science teams.
satellite
radio propagation
Today's Space Weather
Saturday 25 February
last updated 24/2333 UT
Solar activity was low on UT day 24 February. Region 2638 produced a C1.1 flare that peaked at 0012 UT. Very low to low levels of solar activity are expected for the next 3 UT days (25-27 February). Geomagnetic activity was at quiet to active levels across the Australian region on UT day 24 February due to the coronal hole effect. Unsettled levels of geomagnetic activity are expected for 25 February. MUFs were mostly near predicted monthly values during UT day 24 February. Minor to moderate MUF depressions and degradations in HF conditions are expected for 25 February due to the observed rise in geomagnetic activity.
What is Space Weather ?

Space weather refers to changes in the space environment, particularly the region between the Earth and Sun. The "solar wind" from the Sun stream past the Earth and is mostly deflected by the Earth's magnetic field, but variations in the solar wind cause changes in the Earth's magnetic field.

solar prominence

Occasionally, a huge release of magnetic energy, called a solar flare, occurs on the Sun. Flares can produce large quantities of x-rays which affect the Earth's atmosphere. They can also accelerate atomic particles (mostly protons) to very high speeds (a substantial fraction of the speed of light!). These high energy particles are dangerous to man and can reach the stratosphere where jetliners fly.

Most aspects of space weather affect us to some extent. The more our society becomes dependent on technology and the more we utilise space, the more we are affected by space weather. Some aspects of space weather are benevolent, and allow activities not otherwise possible such as long range radio communications. Some aspects are benign but fascinating such as the Aurora, and some are malevolent. Like terrestrial weather, it sometimes depends on the situation and the event.

The image below is an artists impression of the solar wind interacting with the Earth's magnetic field.

Solar wind
A long filament erupted on the sun on August 31, 2012, shown here in this still captured by NASA's Solar Dynamics Observatory (SDO).
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