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--- en:about [2017/11/09 17:09] – external edit 127.0.0.1
+++ en:about [2018/08/14 13:26] (current) – kaklik
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 ====== How do we measure the ionosphere? ======
-Our measuring network focuses on the Earth's ionosphere. It's an upper atmospheric layer which is located approximately in the heights from 60 km to 1000 km. Thanks to the solar activity, the neutral gas is ionized in the ionosphere so the low temperature plasma is created there. Except the Sun, the ionospheric plasma can be influenced by the Jupiter magnetic storms, meteors or some strong gamma ray bursts. In accordance with the height where the plasma is located in, we can devide the ionosphere into three basic regions, D, E and F. Their location depends significantly on the day time and on the season. For example, the D region is nearly completely recombined at night. As a typical summer phenomenon, then, the F region is possibly split into the F1 and F2 regions and so-called sporadic layer can be formed in the E region. \\
+Our measuring network focuses on the Earth's ionosphere. It's an upper atmospheric layer which is located approximately in the heights from 60 km to 1000 km. Thanks to the solar activity, the neutral gas is ionized in the ionosphere so the low temperature plasma is created there. Except the Sun, the ionospheric plasma can be influenced by the Jupiter magnetic storms, meteors or some strong gamma ray bursts. In accordance with the height where the plasma is located in, we can devide the ionosphere into three basic regions, D, E and F. Their location depends significantly on the day time and on the season. For example, the D region is nearly completely recombined at night. As a typical summer phenomenon, then, the F region is possibly split into the F1 and F2 regions and so-called sporadic layer can be formed in the E region.
-The ionospheric regions are shown in Figure 1. The diagram compares their height with the notoriously-known atmospheric layers. \\
+{{ youtube>5opUZO7FMLw?medium }}
+The ionospheric regions are shown in Figure 1. The diagram compares their height with the notoriously-known atmospheric layers.
 [[http://www.sws.bom.gov.au/Images/Educational/Space%20Weather/What%20is%20Space%20Weather/ionosphere.jpg|Figure 1]]
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 [[http://www.rfcafe.com/references/qst/images2/ionosphere-radio-transmission-qst-march-1940-5.jpg|Figure 2]]
 {{:en:ionosphere-radio-transmission-qst-march-1940-5.jpg?400|The scheme of radio signal reflection is shown.}} \\
-The frequency of measured radio signal differs in dependence on the appropriate ionospheric region. The D ionospheric region is monitored by the VLF (Very Low Frequency) measurement within the SID monitors, see [[en:vlf_data|VLF Data Analysis]]. Good results were achieved on the frequency of 23.4 kHz where the [[https://en.wikipedia.org/wiki/VLF_transmitter_DHO38|DHO 38 transmitter]]  can be tuned in. \\
+The frequency of measured radio signal differs in dependence on the appropriate ionospheric region. The D ionospheric region is monitored by the VLF (Very Low Frequency) measurement within the SID monitors, see [[en:vlf_data|VLF Data Analysis]]. Good results were achieved on the frequency of 23.4 kHz where the [[https://en.wikipedia.org/wiki/VLF_transmitter_DHO38|DHO 38 transmitter]] can be tuned in. \\
 [[https://upload.wikimedia.org/wikipedia/commons/9/94/Marinesender_DHO38_L%C3%A4ngstwellensender_der_Marine.jpg|Figure 3]]
 {{:en:dho38.jpg?400|The VLF transmitter DHO 38.}} \\