explain electron plasma frequency
Answers
Answer:
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Explanation:
plasma frequency is the frequency at which electrons oscillate about their equilibrium positions in the absence of a magnetic field.
Plasma interacts with electrical and magnetic fields in ways that can result in vibrations in many frequencies, including the audible range
Answer:
The model gives the plasma frequency as a function of height and is driven by the ionospheric characteristics foE, foF2, M(3000)F2 and either the virtual height h’F or h’F2 as appropriate, whichever is the minimum virtual height of reflection from the F2 layer.
From: The Dynamical Ionosphere, 2020
Explanation:
Selection of Frequency Range
The lowest frequency is limited by in-situ plasma frequency of the satellite in orbit. The plasma (electron) density in ionosphere changes in a year and is dependent on solar activity (in terms of sunspot relative number). The plasma frequency up is expressed as follow
where Ne is electron density and me is electron mass.
The maximum density appears at noon during March to June in a year; whereas minmum density appears at midnight during December in a year. Therefore we can calculate the in-situ plasma frequency (Space Science Dictionary, Science Press, Beijing 1987) as shown in Table 1. According to Table 1, we choose the lowest frequency as 1 MHz.
Table 1. Comparison of changes in the calculated plasma frequency.
Height of Orbit 600 Km 800 Km
Sunspot Number 10 100 10 100
min/max Ne (1011/m3) 0.1162/0.5219 0.3338/1.349 0.0655/0.2710 0.1651/0.4896
μpe(MHz) 0.97/2.04 1.64/3.30 0.728/1.48 1.16/1.99
The highest frequency is selected as 30 MHz. If we apply (1) we may obtain Ne accordingly.