SDO solar image - 131 angstroms - Courtesy of NASA/SDO and the AIA, EVE, and HMI science teams.
radio propagation
Today's Space Weather
Tuesday 09 February
last updated 08/2345 UT
Solar activity during the past 24 hours was at very low levels with one weak C-flare. The outlook for the next 24 hrs is for C-class flares are possible. No earth-directed CMEs were observed over the last 24 hrs. The solar winds is currently near 400 km/s associated with high speed streams from a small equatorial coronal hole. Minor storm conditions were observed over the Australian region during the past 24 hours due to the coronal hole effects and a favourable IMF Bz conditions. Conditions for HF radio wave propagation are expected to depress slightly, following these minor storm conditions. There is chance of arrival of a glancing blow from the 05 Feb CME latter today. Stay tune for more updates on this event.
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
Type II solar radio spectrograph event 17 Dec 2014
What's Inside