en:about
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====== How do we measure the ionosphere? ====== | ====== How do we measure the ionosphere? ====== | ||
- | Our measuring network focuses on the Earth' | + | |
- | The ionospheric regions are shown in Figure 1. The diagram compares their height with the notoriously-known atmospheric layers. | + | Our measuring network focuses on the Earth' |
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+ | The ionospheric regions are shown in Figure 1. The diagram compares their height with the notoriously-known atmospheric layers. | ||
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We can see that the ionospheric regions are also compared using the electron density. This quantity is one of the most important physical diagnostics of any plasma. It shows the amount of charge particles found in unit volume. The electron density is specific for the current time and height and is also strongly influenced by a high-energy impacts reaching the atmosphere. \\ | We can see that the ionospheric regions are also compared using the electron density. This quantity is one of the most important physical diagnostics of any plasma. It shows the amount of charge particles found in unit volume. The electron density is specific for the current time and height and is also strongly influenced by a high-energy impacts reaching the atmosphere. \\ | ||
This phenomenon, which we measure, is called ionospheric response. But how can the ionosphere be measured, indeed? \\ | This phenomenon, which we measure, is called ionospheric response. But how can the ionosphere be measured, indeed? \\ | ||
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- | 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: | + | 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: |
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However, no ionospheric region is a homogenous layer. The plasma drifts strongly in horizontal and vertical direction as well. For example, the focusion and defocusion of charge particles can be discussed, see Figure 6. \\ | However, no ionospheric region is a homogenous layer. The plasma drifts strongly in horizontal and vertical direction as well. For example, the focusion and defocusion of charge particles can be discussed, see Figure 6. \\ | ||
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+ | To get the exact data of this plasma flow, the Doppler measurement has been designed. The method is based on the Doppler Effect, which can be described as a frequency change induced by some locomotion. It is known that if the measured plasma approaches us, the frequency escalates and if it recedes, the frequency is tapered off. Because of these phenomena, the blue and red shift can be recognized and measured. It provides us to have the exact specification of the ionospheric drift. \\ | ||
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en/about.txt · Last modified: 2018/08/14 13:26 by kaklik