SDO solar image - Helioseismic and Magnetic Imager (HMI image)- Courtesy of NASA/SDO and the AIA, EVE, and HMI science teams.
satellite
radio propagation
Today's Space Weather
Thursday 03 September
last updated 02/2335 UT
Solar activity during the past 24 hours was very low. A small equatorial coronal hole is now at geoeffective position on the solar disk and the high speed solar winds emanating from this coronal hole has arrived at earth. Minor geomagnetic storms could be possible over the next 24 hours. There is small chance that aurora would be visible during the local night hours of the 3 Sep from Tasmania and other southern most regions of Australia. Conditions for HF radio wave propagation are still unusually depressed.
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
A long filament erupted on the sun on August 31, 2012, shown here in this still captured by NASA's Solar Dynamics Observatory (SDO).
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