FORECAST SOL: Normal green MAG: Normal green ION: Normal green
SDO solar image - 1700 angstroms - Courtesy of NASA/SDO and the AIA, EVE, and HMI science teams.
radio propagation
Today's Space Weather
Thursday 26 April
last updated 25/2315 UT
Solar activity was at very low levels on UT day 25 April. Very Low levels of solar flare activity are expected for the next three UT days, 26-28 April. Geomagnetic conditions were quiet across the Australian region during the UT day 25 April. Geomagnetic conditions are expected to be mainly quiet to unsettled on 26 and 27 April with the possibility of isolated active periods on both these days. Mostly quiet geomagnetic conditions may be expected on 28 April. MUFs were mainly near predicted monthly values with periods of minor depressions in some low-latitude areas on UT day 25 April. Periods of minor MUF enhancements were recorded in some mid- and high-latitude areas on this day. Minor to moderate MUF depressions and degradations in HF conditions may be expected on 26 and 27 April. HF conditions may be expected to return to normal levels on 28 April.
What is Space Weather ?

Impacts on Critical Infrastructure.

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
Combined image of active region 1520 shortly before it unleashed an X-class flare. The image is made up of light in the 171 Angstrom wavelength, and a magnetogram.
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