An empirical profile of VLF triggered emissions
The Siple Transmitter Experiment operated from 1973 to 1988 and generated a wealth of observations of nonlinear wave-particle interactions including extensive recordings of triggered emissions generated by VLF signals injected into the magnetosphere from the transmitter at Siple Station, Antarctica....
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ftunivkocdc:oai:libdigitalcollections.ku.edu.tr:IR/648 2024-09-15T17:45:32+00:00 An empirical profile of VLF triggered emissions İnan, Umran Savaş (ORCID 0000-0001-5837-5807 & YÖK ID 177880) Li, J. D.; Spasojevic, M. College of Engineering Department of Electrical and Electronics Engineering 2015 pdf https://doi.org/10.1002/2015JA021444 http://libdigitalcollections.ku.edu.tr/cdm/ref/collection/IR/id/648 English eng American Geophysical Union (AGU) International Publisher version Koç University Institutional Repository IR00593 177880 2169-9380 2169-9402 Li, J. D., M. Spasojevic, and U. S. Inan. "An Empirical Profile of Vlf Triggered Emissions." Journal of Geophysical Research-Space Physics 120.8 (2015): 6581-95. http://dx.doi.org/10.1002/2015JA021444 WoS; Scopus FA9453-11-C-0011 NA http://libdigitalcollections.ku.edu.tr/cdm/ref/collection/IR/id/648 Journal of Geophysical Research: Space Physics Astronomy and astrophysics Siple Station Elf Vlf Wave Particle Interactions Triggered Emissions Radiation Belts Journal article text/academic publication 2015 ftunivkocdc https://doi.org/10.1002/2015JA021444 2024-07-17T03:48:41Z The Siple Transmitter Experiment operated from 1973 to 1988 and generated a wealth of observations of nonlinear wave-particle interactions including extensive recordings of triggered emissions generated by VLF signals injected into the magnetosphere from the transmitter at Siple Station, Antarctica. Due to their complex appearance and immensely varied behavior, triggered emissions remain poorly described and understood. This work provides a comprehensive statistical description of observed triggered emissions and establishes statistical bounds on triggered emission type (fallers, risers, and positive and negative hooks) and behavior (frequency changes between 1kHz and 2.5kHz with initial sweep rates between -2.5kHz/s and 2.5kHz/s, with risers undergoing a median frequency change of 556Hz and fallers a median frequency change of -198Hz). The statistical study also reveals an apparent dependence of the triggered emission behavior on the transmitted signal itself. Long tones and rising ramps generate more risers and positive hooks, while short tones and falling ramps produce more fallers and negative hooks. Triggered emissions also appear to favorably initiate with sweep rates similar to that of the triggering element, with the 1kHz/s rising ramps triggering initial risers with a median sweep rate of 1.03kHz/s and -1kHz/s triggering initial fallers with a median sweep rate of -0.73kHz/s. These results improve observations of wave modification resulting from wave-particle interactions in the radiation belts and can be used to validate numerical simulations of triggered emissions. AFRL Article in Journal/Newspaper Antarc* Antarctica Koç University Suna Kıraç Library’ Digital Collections Journal of Geophysical Research: Space Physics 120 8 6581 6595 |
institution |
Open Polar |
collection |
Koç University Suna Kıraç Library’ Digital Collections |
op_collection_id |
ftunivkocdc |
language |
English |
topic |
Astronomy and astrophysics Siple Station Elf Vlf Wave Particle Interactions Triggered Emissions Radiation Belts |
spellingShingle |
Astronomy and astrophysics Siple Station Elf Vlf Wave Particle Interactions Triggered Emissions Radiation Belts An empirical profile of VLF triggered emissions |
topic_facet |
Astronomy and astrophysics Siple Station Elf Vlf Wave Particle Interactions Triggered Emissions Radiation Belts |
description |
The Siple Transmitter Experiment operated from 1973 to 1988 and generated a wealth of observations of nonlinear wave-particle interactions including extensive recordings of triggered emissions generated by VLF signals injected into the magnetosphere from the transmitter at Siple Station, Antarctica. Due to their complex appearance and immensely varied behavior, triggered emissions remain poorly described and understood. This work provides a comprehensive statistical description of observed triggered emissions and establishes statistical bounds on triggered emission type (fallers, risers, and positive and negative hooks) and behavior (frequency changes between 1kHz and 2.5kHz with initial sweep rates between -2.5kHz/s and 2.5kHz/s, with risers undergoing a median frequency change of 556Hz and fallers a median frequency change of -198Hz). The statistical study also reveals an apparent dependence of the triggered emission behavior on the transmitted signal itself. Long tones and rising ramps generate more risers and positive hooks, while short tones and falling ramps produce more fallers and negative hooks. Triggered emissions also appear to favorably initiate with sweep rates similar to that of the triggering element, with the 1kHz/s rising ramps triggering initial risers with a median sweep rate of 1.03kHz/s and -1kHz/s triggering initial fallers with a median sweep rate of -0.73kHz/s. These results improve observations of wave modification resulting from wave-particle interactions in the radiation belts and can be used to validate numerical simulations of triggered emissions. AFRL |
author2 |
İnan, Umran Savaş (ORCID 0000-0001-5837-5807 & YÖK ID 177880) Li, J. D.; Spasojevic, M. College of Engineering Department of Electrical and Electronics Engineering |
format |
Article in Journal/Newspaper |
title |
An empirical profile of VLF triggered emissions |
title_short |
An empirical profile of VLF triggered emissions |
title_full |
An empirical profile of VLF triggered emissions |
title_fullStr |
An empirical profile of VLF triggered emissions |
title_full_unstemmed |
An empirical profile of VLF triggered emissions |
title_sort |
empirical profile of vlf triggered emissions |
publisher |
American Geophysical Union (AGU) |
publishDate |
2015 |
url |
https://doi.org/10.1002/2015JA021444 http://libdigitalcollections.ku.edu.tr/cdm/ref/collection/IR/id/648 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Journal of Geophysical Research: Space Physics |
op_relation |
Publisher version Koç University Institutional Repository IR00593 177880 2169-9380 2169-9402 Li, J. D., M. Spasojevic, and U. S. Inan. "An Empirical Profile of Vlf Triggered Emissions." Journal of Geophysical Research-Space Physics 120.8 (2015): 6581-95. http://dx.doi.org/10.1002/2015JA021444 WoS; Scopus FA9453-11-C-0011 NA http://libdigitalcollections.ku.edu.tr/cdm/ref/collection/IR/id/648 |
op_doi |
https://doi.org/10.1002/2015JA021444 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
120 |
container_issue |
8 |
container_start_page |
6581 |
op_container_end_page |
6595 |
_version_ |
1810493413965955072 |