SDO solar image - 211 angstroms - Courtesy of NASA/SDO and the AIA, EVE, and HMI science teams.
radio propagation
Today's Space Weather
Thursday 26 November
last updated 25/2328 UT
Solar flare activity was low during 25 Nov UT and it is expected to be very low to low today, 26 Nov. There are currently no Earthward directed Coronal Mass Ejections (CMEs). The Earth is immersed in very slow solar wind with the speed of about 250 km/s. Geomagnetic conditions are expected to be quiet to unsettled during the next 48 hours. Conditions for HF radio communication are expected to be normal to enhanced throughout the Australian region today.
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
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Type II solar radio spectrograph event 17 Dec 2014
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