I am new in telecomunications and this question just came up today and I coudn't find an explanation.

Here is the most common model for the ionosphere:

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The ionosphere layer E is the main resposible for the reflection of the VHF signal which will allow communication over long distances during the day. But, during night, we don't have E layer because of the absence of the sun.

So, how does it happens during night? Does F2 layer became the main responsible for the reflection of the VHF signals?

  • \$\begingroup\$ It's typically for HF we talk about ionospheric refractions, not VHF. (Though that is also possible) \$\endgroup\$ – MrGerber Jan 20 '18 at 23:35

Basically, at night, you simply don't get long-range propagation of VHF signals at all, unless you bounce them off of something else, such as a satellite or the moon — or even ionized meteor trails.

I would recommend directing any followup questions to Amateur Radio.SE. Those people have more direct experience in this area.

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