Relationship Between the Radio Bursts from the Sun and Ionospheric Propagation

Details Relationship Between the Radio Bursts from the Sun and Ionospheric Propagation Relationship Between the Radio Bursts from the Sun and Ionospheric Propagation

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.1603w&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #16.03; Bulletin of the American Astronomical Society, V

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We are monitoring the sun’s radio activity at 20.1 MHz with a Radio Jove rig, and have begun to monitor the Earth’s ionosphere for HF radio propagation using the worldwide network of beacons set up by the Northern California DX Foundation. These 18 beacons transmit at 14.1, 18.11, 21.15, 24.93, and 28.2 MHz on a 3 minute cadence and allow ham radio operators to judge the radio propagation characteristics to distant lands easily.
Although the solar activity cycle is now near its bottom, there are occasional outbursts, some spectacular. August 29, 2006, was such a day, prompting the Radio Jove community to post ten times the usual number of reports to the archive at Goddard Space Flight Center. The next day the Earth’s ionosphere suddenly blossomed with HF openings without any X-ray flares reported. The delay time of 26 hours from the most energetic radio event indicated a velocity of 1600 km/s, normal for a coronal mass ejection. Several other events have also shown delays of about 24 hours from the radio sun to the ionosphere, and are especially noticeable at the higher frequency bands and on the events list of the Space Environment Center of NOAA.
The 20.1 MHz monitors may serve as a method to predict radio propagation properties of the ionosphere more quickly than previous methods.

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