Digital Spectra of Artificially Stimulated VLF Emissions.
New features of artificially stimulated VLF emissions from the magnetosphere have been discovered by using high resolution digital spectral analysis techniques. Several hundred emissions triggered by three VLF transmitters (NAA, Omega, Siple Station, Antarctica) have been examined. The stimulated em...
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ftdtic:ADA022833 2023-05-15T14:01:32+02:00 Digital Spectra of Artificially Stimulated VLF Emissions. Stiles,Gardiner Stuart STANFORD UNIV CALIF STANFORD ELECTRONICS LABS 1974-12 text/html http://www.dtic.mil/docs/citations/ADA022833 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA022833 en eng http://www.dtic.mil/docs/citations/ADA022833 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Atmospheric Physics Radiofrequency Wave Propagation *EMISSION *MAGNETOSPHERE *WHISTLERS DIGITAL SYSTEMS GROWTH(GENERAL) POWER SPECTRA ELECTRONS RESONANCE TRANSMITTERS TRAVELING WAVE TUBES VERY LOW FREQUENCY Text 1974 ftdtic 2016-02-20T10:45:18Z New features of artificially stimulated VLF emissions from the magnetosphere have been discovered by using high resolution digital spectral analysis techniques. Several hundred emissions triggered by three VLF transmitters (NAA, Omega, Siple Station, Antarctica) have been examined. The stimulated emissions initially grow at the frequency of the triggering signal. The emissions always initially rise above the frequency of the triggering signal; this rise is independent of the final slope of the emissions. The emissions characteristically show exponential growth in time with rates that vary from 25 to 250 dB/s. Growth may continue past termination of the triggering signal and appears to be independent of the emission frequency over a range of at least several hundred Hz. The growth also may cease prior to termination. Emission amplitudes may reach 30 dB or more above the level of the triggering signal. Studies of a limited set of the data indicate that lower growth rates are observed when emission activity is just beginning or just ending. These periods are usually characterized by falling rather than rising emissions. These observations are in good agreement with a theory that attributes the emissions to an interaction between the triggering signal and counter-streaming gyroresonant electrons. Text Antarc* Antarctica Defense Technical Information Center: DTIC Technical Reports database Siple ENVELOPE(-83.917,-83.917,-75.917,-75.917) |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Atmospheric Physics Radiofrequency Wave Propagation *EMISSION *MAGNETOSPHERE *WHISTLERS DIGITAL SYSTEMS GROWTH(GENERAL) POWER SPECTRA ELECTRONS RESONANCE TRANSMITTERS TRAVELING WAVE TUBES VERY LOW FREQUENCY |
spellingShingle |
Atmospheric Physics Radiofrequency Wave Propagation *EMISSION *MAGNETOSPHERE *WHISTLERS DIGITAL SYSTEMS GROWTH(GENERAL) POWER SPECTRA ELECTRONS RESONANCE TRANSMITTERS TRAVELING WAVE TUBES VERY LOW FREQUENCY Stiles,Gardiner Stuart Digital Spectra of Artificially Stimulated VLF Emissions. |
topic_facet |
Atmospheric Physics Radiofrequency Wave Propagation *EMISSION *MAGNETOSPHERE *WHISTLERS DIGITAL SYSTEMS GROWTH(GENERAL) POWER SPECTRA ELECTRONS RESONANCE TRANSMITTERS TRAVELING WAVE TUBES VERY LOW FREQUENCY |
description |
New features of artificially stimulated VLF emissions from the magnetosphere have been discovered by using high resolution digital spectral analysis techniques. Several hundred emissions triggered by three VLF transmitters (NAA, Omega, Siple Station, Antarctica) have been examined. The stimulated emissions initially grow at the frequency of the triggering signal. The emissions always initially rise above the frequency of the triggering signal; this rise is independent of the final slope of the emissions. The emissions characteristically show exponential growth in time with rates that vary from 25 to 250 dB/s. Growth may continue past termination of the triggering signal and appears to be independent of the emission frequency over a range of at least several hundred Hz. The growth also may cease prior to termination. Emission amplitudes may reach 30 dB or more above the level of the triggering signal. Studies of a limited set of the data indicate that lower growth rates are observed when emission activity is just beginning or just ending. These periods are usually characterized by falling rather than rising emissions. These observations are in good agreement with a theory that attributes the emissions to an interaction between the triggering signal and counter-streaming gyroresonant electrons. |
author2 |
STANFORD UNIV CALIF STANFORD ELECTRONICS LABS |
format |
Text |
author |
Stiles,Gardiner Stuart |
author_facet |
Stiles,Gardiner Stuart |
author_sort |
Stiles,Gardiner Stuart |
title |
Digital Spectra of Artificially Stimulated VLF Emissions. |
title_short |
Digital Spectra of Artificially Stimulated VLF Emissions. |
title_full |
Digital Spectra of Artificially Stimulated VLF Emissions. |
title_fullStr |
Digital Spectra of Artificially Stimulated VLF Emissions. |
title_full_unstemmed |
Digital Spectra of Artificially Stimulated VLF Emissions. |
title_sort |
digital spectra of artificially stimulated vlf emissions. |
publishDate |
1974 |
url |
http://www.dtic.mil/docs/citations/ADA022833 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA022833 |
long_lat |
ENVELOPE(-83.917,-83.917,-75.917,-75.917) |
geographic |
Siple |
geographic_facet |
Siple |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA022833 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766271379309592576 |