Solar Radio Observations at HF for 29 May 2012
Where needed, additional descriptive information is provided below the images. No audio is available for these charts.
The chart above shows high levels of radio frequency interference bracketing at least two weak solar bursts, one at 1640:15 and another at 1541:15. The spike at 1541:45 probably was caused by the frequency sweep from an over-the-horizon radar or ionosonde.