SDO solar image - 304 angstroms - Courtesy of NASA/SDO and the AIA, EVE, and HMI science teams.
satellite
radio propagation
Today's Space Weather
Sunday 02 August
last updated 01/2334 UT
Very low solar flare activity. Coronal hole effects in progress. Strong solar wind. Despite a strong solar wind stream the geomagnetic activity did not rise as per the previous expectations, possibly because the Bz component of IMF remained mostly positive over the last 24 hours. Geomagnetic conditions may be expected to stay mostly at quiet to unsettled levels with small possibility of isolated active periods on 2 August. High-frequency radio communications are expected to remain normal to fair due to continued low levels of ionising radiation and expected minor rise in geomagnetic activity levels on 2 August.
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
Collage of images - Power lines, Learmonth Observatory, pipeline, Magnetometer measurements , Aurora at Casey, an Ionogram, and Satellite.
What's Inside