LAY
发表于 2025-3-28 17:23:38
Properties of a magnetized plasmaere. It was soon found that the terrestrial magnetic field must be the source of this phenomenon. In fact, the oscillation of each individual electron excited by the electric field of the wave is disturbed by the magnetic field which exercises a force perpendicular to the motion of the charge. There
AXIOM
发表于 2025-3-28 20:22:51
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明确
发表于 2025-3-28 23:24:40
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正常
发表于 2025-3-29 06:46:41
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BAIL
发表于 2025-3-29 09:50:56
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积云
发表于 2025-3-29 15:01:41
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时间等
发表于 2025-3-29 16:45:28
Propagation in the space between Earth and ionosphere (deka- and hektometer-waves)ortance, on the other hand, is mainly still due to the fact that it allows waves with frequencies in the HF-band and below to propagate from ground to ground over very large distances, and that it influences quite considerably the ground-to-space and space-to-ground propagation of radio waves of hig
惩罚
发表于 2025-3-29 20:58:51
Propagation through the ionosphere the ultraviolet ranges. In fact, absorption sets the decisive limits to groundbased optical astronomy. The situation is quite different with radio waves. While strong absorption occurs only in certain frequency ranges and at certain hours (e.g. for LF and MF waves during daylight hours), the most i
清唱剧
发表于 2025-3-30 01:20:21
Propagation in the Earth-ionosphere waveguide (Kilometric and longer waves)low, in the D-layer. Our considerations in Section 3.3 and Chapter 6 were for small . (= ./.) so that the collisional influence remained weak. The reflection mechanism was “refractive” because an electron made many oscillations before it was stopped by a collision. It was justified to consider (in C
ABYSS
发表于 2025-3-30 06:09:44
The real ionosphere: Irregularities and acoustic-gravity waves depending only on the vertical coordinate. This, however, is an oversimplification because the actual conditions in the terrestrial ionosphere are more involved. Since the ionosphere is under solar control, all ionospheric parameters vary with local time so that large-scale horizontal gradients exi