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
Tuesday 28 March
last updated 28/0013 UT
Solar activity was at Low levels during the UT day 27 March. Low levels of solar activity with a slight chance of Moderate activity are expected today, 28 March. The Earth is currently under the influence of Very Strong solar wind streams from a large coronal hole, currently at 680km/s. Geomagnetic activity reached Minor Storm levels across the Australian region on UT day 27 March. The Australian Dst index reached -120 nT. A prolonged southward IMF Bz could lead to similar geomagnetic condition today,28 March. Minor to Moderate MUF depressions and degradations in HF conditions due to increased geomagnetic activity are expected today. Auroras may be visible tonight, 28 March in Tasmania.
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
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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