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.
radio propagation
Today's Space Weather
Friday 21 June
last updated 20/2314 UT
Solar activity has been very low today (UT day 20 June). Solar activity is expected to stay at very low levels for the next three UT days (21 to 23 June). Geomagnetic activity across Australian regions stayed mostly at quiet levels with isolated unsettled periods today. Global geomagnetic activity may be expected to stay mostly at quiet levels for the next 3 UT day with some possibility of occasional rises to unsettled levels on UT day 21 June. Maximum usable frequencies (MUFs) stayed near the predicted monthly values with some periods of minor to moderate enhancements today. MUFs may be expected to stay mostly around the predicted monthly values for the next 3 UT days.
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
A long filament erupted on the sun on August 31, 2012, shown here in this still captured by NASA's Solar Dynamics Observatory (SDO).
What's Inside