Table 1

The Fresnel length at altitudes of 70 km, 200 km, 350 km, and 700 km for three different frequencies received by LOFAR station CS002. The ranges represent calculation using the source elevation for the start and for the end of the first hour of observation. Values are in km.

Altitude 70 km 200 km 350 km 700 km
 25.19 MHz 1.4 2.3–2.4 3.0–3.2 4.3–4.5
 35.15 MHz 1.2 1.9–2.0 2.6–2.7 3.6–3.8
 60.15 MHz 0.9 1.5–1.6 2.0–2.1 2.8–2.9

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