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   Home  Geophysical  Auroral Oval Saturday, Jul 05 2008 20:17 UT
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Auroral Oval


If your browser recognized the applet tag, you would see an applet here.

The auroral oval is an annular ring around each geomagnetic pole where aurora are most likely to occur. The aurora are caused by the excitation of particles from the Sun spiralling in the geomagnetic field near the poles resulting in the release of energy in different forms, including light. The above model attempts to predict the location of the auroral oval around the geomagnetic south pole. Images and reports of auroral displays are often reported to IPS. A listing of previous aurora observation reports is available here.

Hourly Riometer Absoprtion Values

Last updated 05 Jul 2008 19:40 UT

Sat Jul  5 19:39:54 GMT 2008
Macquarie Island   0.0 dB
Casey             -0.0 dB
Davis              0.0 dB
Mawson             0.4 dB

A riometer is a "relative ionospheric opacity metre" which measures the amount of absorption of galactic radio noise as this signal passes through the Earths ionosphere. During geomagnetic storm activity, auroral activity can increase, increasing the level of ionospheric absorption of this natural radio signal, indicating possible disruptons to polar and transpolar HF radio communication, if the radio wave has a reflection point in the auroral zone. Absorption can also increase dramatically for up to several days, in polar regions, due to solar proton events, following strong solar flare activity.

  • Antarctic Riometer time series plot



  • IPS (Ionospheric Prediction Service) is a unit of the Bureau of Meteorology

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