Midlatitude propagation of VLF to MF waves through nighttime ionosphere above powerful VLF transmitters
نویسندگان
چکیده
منابع مشابه
Penetration of lightning MF signals to the upper ionosphere over VLF ground-based transmitters
[1] The MF data recorded by the low-altitude satellite DEMETER have been used to survey the MF waves around the Earth. A global map of the MF emissions indicates that there exists a wave activity in the frequency range 2–2.5 MHz above the main powerful VLF ground-based transmitters operating in the frequency range 18–50 kHz. It is shown that this is due to the high-frequency part of whistlers i...
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[1] ELF/VLF radio waves (300 Hz to 30 kHz) have been successfully generated via modulated HF (3–10 MHz) heating of the lower ionosphere in the presence of natural currents, most recently with the HAARP facility in Alaska. Generation is possible via amplitude modulation or via two techniques involving motion of the HF beam during the ELF/VLF cycle, known as beam painting and geometric modulation...
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This work addresses some of the key topics of space physics research recommended in the National Research Council 2003 report “A Decadal Research Strategy in Solar and Space Physics”, namely, the thunderstorm-driven electrodynamic coupling between the troposphere, mesosphere, lower ionosphere, and magnetosphere. Lightning-induced electron precipitation encompasses all of these regions, from atm...
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Remote sensing of the ionosphere bottom using long wave radio signal propagation is a still going stro g and inexpensive method for continuous monitoring purposes. We present a propagation model describing the time development of solar flare effects. Based on monitored amplitude and phase data from VLF/LF transmitters gained at a mid-latitude site during the currently increasing solar cycle no....
متن کاملThe impact of PMSE and NLC particles on VLF propagation
PMSE or Polar Mesosphere Summer Echoes are a well-known phenomenon in the summer northern polar regions, in which anomalous VHF/UHF radar echoes are returned from heights ∼85 km. Noctilucent clouds and electron density biteouts are two phenomena that sometimes occur together with PMSE. Electron density biteouts are electron density depletion layers of up to 90%, which may be several kms thick. ...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Space Physics
سال: 2013
ISSN: 2169-9380
DOI: 10.1002/jgra.50177