AURORA :: Propagation Resource Center :: HFRadio.org
August 2010 -- Help is needed, monthly: monthly bandwidth/connectivity fees as well as other expenses must be paid to keep this space weather and radio propagation resource up and running. Last month we received just enough to cover the core expenses, but we still need to replace some aging hardware. If you find this site useful, would you please help out, today? I need your help to offset the cost of running this server and providing these web resources (space weather, amateur radio, shortwave listening, and more). If you can help, today, please make a donation to HFRadio.org - click the PayPal button, to help -->
- Is HF Propagation Reciprocal?
- De-mystifying HF Radio Propagation and Modeling
Check out the ACE-HF propagation software
- the latest is version 2.05. ACE-HF is propagation forecasting and modeling for Amateur Radio as well as for Shortwave radio Listening and general HF operation. This software is even used by the military and other clients around the world. This software is developed and maintained by the same engineers that keep VOACAP up-to-date. As a result, this software is the most accurate user interface integrated with VOACAP. CHECK IT OUT, TODAY
. This software is the most accurate modeling software available, and is endorsed by NW7US. Read the details to find out why
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Tomas David Hood - NW7US
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Other links of interest:
- PropNET - live propagation studies
- Shortwave Radio Resource Center
- Shortwave Broadcasting Search
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IN THE NEWS: Auroral Kilometric Radiation (AKR)
Researchers have known for three decades that the Earth is a potent radio transmitter, but they were never able to pinpoint where the noise was coming from. By using data from the four spacecraft of the European Space Agency's Cluster mission, NASA-funded scientists have now precisely located the source of that radio noise along magnetic field lines several thousand miles above bright regions in Earth's northern lights.
Though AKR is not detectable from the Earth's surface - the ionosphere blocks most radio waves from space at those frequencies - it is the most important and intense naturally occurring radio emission from Earth. Sounding like sporadic bursts of high-pitched whistles and squawks, AKR is emitted by Earth about one-third to one-half of every day at a signal strength as high as one billion Watts.
The most potent commercial radio signals on Earth are only 100,000 Watts, meaning that AKR would drown out much of our AM radio signals were it not for the ionosphere (a tenuous layer of electrified gas at the boundary between Earth's atmosphere and space).
To read more about this, check out the news article at http://spacedaily.com
- and, visit the headquarters for the CLUSTER mission