2,5+ million of Field Strength Data from ITU

Tehran-Norddeich_1983-1989_15K1MHz_3D1

Seven years of hourly field strength data of a transmitter in Tehran/Iran, received at Norddeich/Northern Germany. You clearly see the influence of time, day, season and solar activity.

 

The International Telecommunications Union recently published many information for free, which had been locked for years behind an often impressive cash house or had been available just for a few blessed.

Among these information is a bonanza of 2,5+ million of normalized field strength data from the years 1969 to 1993. This time covers two solar cycles and by far doesn’t provide insights of only historical interest: You e.g. may visualize some circuits to see the influence of day, time and solar activity at a glance. And you may use this data to analyze some dependence between field strength and solar/geomagnetic activity.

As these data so far hasn’t attracted any interest of ham radio magazines, we are just at the beginning to make use of it. Join in!

The diagram at the top has been made with QtiPlot software. The same software has been used to visualize solar and geomagnetic WDC data, obtained from GFZ Potsdam – see diagram at the bottom.

Kp_vs-Flux_2

Solar flux (F10,7) vs. geomagnetic activity (Kp index), 1969-1993.