Collecting WWV Information

SpotCollector Online Help Contents


While its primary role is to collect spots, SpotCollector also facilitates propagation prediction by capturing WWV information from the spot sources to which it is connected:

These parameters are automatically captured and recorded. The most recent values for these parameters are shown in the WWV panel in the upper left of SpotCollector's Spot Database window . A graphical view of these parameters over the most recent 31 days can be viewed by clicking the WWV panel's Hist button; given the sun's 27-day rotation period, this view can be helpful in predicting future propagation. Depressing the CTRL key while clicking the Hist button will ensure that the window displaying the graphical view appears "on top" if it should overlap with SpotCollector's Main window.

SpotCollector automatically conveys the most recent SFI  to PropView, allowing propagation prediction without manual entry of this parameter.

If the A-index exceeds 30, the letter A in the WWV panel is displayed in bold red font to indicate that the iononsphere is disturbed by a geomagnetic storm. You can configure SpotCollector to play a thunderclap sound when the A-index exceeds 30 at startup, or when the A-index is reported to increase to a value greater than 30.

You can optionally display a Smoothed Sunspot Number estimated from the last-reported solar flux index by double clicking the word SFI in the WWV panel; clicking the word SSN will display the last-reported solar flux index. The Smoothed Sunspot Number is estimated using the equation

S = (33.52 x (85.12 +SFI)1/2) -408.99

as shown on page 23-25 of the ARRL Antenna Handbook, 16th Edition.