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Ionosphere - Revision history
2026-04-27T13:40:07Z
Revision history for this page on the wiki
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https://www.marcelpost.com/wiki/index.php?title=Ionosphere&diff=3088&oldid=prev
Admin at 21:34, 18 March 2019
2019-03-18T21:34:18Z
<p></p>
<p><b>New page</b></p><div>The ionosphere is defined as the layer of the Earth's atmosphere that is ionized by solar and cosmic radiation. It lies 75-1000 km (46-621 miles) above the Earth. (The Earth's radius is 6370 km, so the thickness of the ionosphere is quite tiny compared with the size of Earth.)<br />
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===Layers:===<br />
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{| style="background-color:#f9f9f9;" cellpadding="10" cellspacing="0" border="1"<br />
|style="background-color:#f2f2f2;"|<b>Layer</b><br />
|style="background-color:#f2f2f2;"|<b>Height</b><br />
|style="background-color:#f2f2f2;"|<b>Effect</b><br />
|style="background-color:#f2f2f2;"|<b>Active</b><br />
|style="background-color:#f2f2f2;"|<b>Daytime Characteristics</b><br />
|style="background-color:#f2f2f2;"|<b>Night time Characteristics</b><br />
|style="background-color:#f2f2f2;"|<b>Usage</b><br />
|-<br />
|F2<br />
|150 - 500km<br />
|refract<br />
|day and night<br />
|Refracts below MUF (~30MHz)<br />
|Refracts below MUF (~30MHz)<br />
|night-time DX<br />
|-<br />
|F1<br />
|150 - 500km<br />
|refract<br />
|daytime<br />
|Refracts below MUF (~30MHz)<br />
|weak refraction<br />
|<br />
|-<br />
|Es<br />
|?<br />
|refract<br />
|Sporadic<br />
|Refracts below 50MHz<br />
|Refracts below 50MHz<br />
|DX<br />
|-<br />
|E<br />
|90 - 150km<br />
|refract<br />
|daytime<br />
|Refracts below 10MHz<br />
|weak refraction after sunset<br />
|working greyline DX<br />
|-<br />
|D<br />
|60 - 90km<br />
|absorb<br />
|nighttime<br />
|Attenuates <10MHz peak attenuation at noon<br />
|minimal<br />
|local MF and low HF stations during the day<br />
|}<br />
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===Bands:===<br />
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{| style="background-color:#f9f9f9;" cellpadding="10" cellspacing="0" border="1"<br />
|style="background-color:#f2f2f2;"|<b>Band</b><br />
|style="background-color:#f2f2f2;"|<b>Frequency</b><br />
|style="background-color:#f2f2f2;"|<b>Best at</b><br />
|style="background-color:#f2f2f2;"|<b>Worst at</b><br />
|style="background-color:#f2f2f2;"|<b>Typical use</b><br />
|-<br />
|630m<br />
|470kHz<br />
|Night<br />
|Day<br />
|only usable during the night, local<br />
|-<br />
|160m<br />
|1.8MHz<br />
|Night<br />
|Day<br />
|only usable during the night, local<br />
|-<br />
|80m<br />
|3.6MHz<br />
|Night<br />
|daytime<br />
|DX at night, local during the day<br />
|-<br />
|40m<br />
|7.1MHz<br />
|Night<br />
|<br />
|DX at night, local during the day<br />
|-<br />
|30m<br />
|10MHz<br />
|<br />
|<br />
|<br />
|-<br />
|20m<br />
|14.1MHz<br />
|day and night<br />
|<br />
|most reliable DX band<br />
|-<br />
|15m<br />
|21MHz<br />
|day and night<br />
|<br />
|<br />
|-<br />
|10m<br />
|28MHz<br />
|day<br />
|night<br />
|daytime to early evening<br />
|-<br />
|6m<br />
|50MHz<br />
|day<br />
|night<br />
|daytime to early evening<br />
|}</div>
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