FORECAST SOL: Normal green MAG: Moderate yellow ION: Moderate yellow
SDO solar image - 193 angstroms - Courtesy of NASA/SDO and the AIA, EVE, and HMI science teams.
satellite
radio propagation
Today's Space Weather
Tuesday 19 November
last updated 18/2329 UT
Solar activity was very low today (UT day 18 November). Very low levels of solar activity are expected for the next three UT days (19 to 21 November). Today, geomagnetic activity stayed at quiet levels in the Australian/NZ regions and from quiet to unsettled levels in the Antarctic regions. Global geomagnetic activity is expected to stay mostly at quiet levels through UT day 19 November and then rise to unsettled and active levels through UT days 20 and 21 November. MUFs varied from near predicted monthly values to depressed moderately today. Nearly similar HF conditions may be expected through UT day 19 November with the possibility of further MUF depressions through UT days 20 and 21 November.
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
Aurora Australis as seen from the International Space Station, with the port wing of space shuttle Atlantis, and segment of a boom sensor system attached to the shuttle's robotic arm.
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