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
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.
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Australian Sky Links
- Sydney Observatory - offers a monthly sky chart to learn about the evening sky.
- Melbourne Planetarium - offers a monthly 'what's in the sky' service.
- Skymaps.com - specializing in high quality custom-designed maps of the night sky
- NightSkyOnline - Paul Floyd's website on Australian sky events.
- Nightfall - educational resources, satellite observing, e-groups and monthly features.
- Welcome to Astronomy - an introduction to sky watching by the Astronomical Society of South Australia.
- Quasar Publishing - produce astronomy year books and planispheres, plus loads of useful tips and links for amateurs including sky views.
- SpaceInfo - Australian daily astronomy and space news site
- Space Weather - IPS Radio and Space Services - current space weather conditions in our part of the solar system.
- Paul Floyd's astro site - current astronomical events on the east cost of Australia.
Images @ Melopopzdropz Flickr
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