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--- en:vlf_data [2016/04/12 08:37] – vojtik
+++ en:vlf_data [Unknown date] (current) – external edit (Unknown date) 127.0.0.1
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 **What do we measure by the SID monitors?** \\
-The SID monitors are inductive loops that receive radio signal from a transmitter with the characteristic frequency given. While the signal spreads through the ionospheric plasma, its intesity changes in dependence on the current electron density. We model the electron plasma frequency using the measurement of the radio signal intensity level, which helps us to determine other quantites and phenomena. The transmitter’s characteristic frequency must be known, too. For our computations, the radio signal from the DHO 38 transmitter located in north - western Germany is used. Its frequency equals 23.4 kHz. We deduce that this frequency converges to the critical frequency of the D ionospheric layer. \\
+The SID monitors are inductive coils that receive radio signal from a transmitter with the characteristic frequency given. While the signal spreads through the ionospheric plasma, its intesity changes in dependence on the current electron density. We model the electron plasma frequency using the measurement of the radio signal intensity level, which helps us to determine other quantites and phenomena. The transmitter’s characteristic frequency must be known, too. For our computations, the radio signal from the DHO 38 transmitter located in north - western Germany is used. Its frequency equals 23.4 kHz. We deduce that this frequency converges to the critical frequency of the D ionospheric layer. \\
 The plot describing how the measured data look like is shown.\\
 [[https://raw.githubusercontent.com/Ionozor/data-processing/master/Octave/data/Sample%20data/SID_model_date.jpg|Figure 1]]