Quasi-periodic ELF/VLF emissions with atypical time structure inside the plasmasphere
Some results of observations on board the Van Allen probe A spacecraft of atypical quasi-periodic VLF electromagnetic emissions inside the plasmasphere are discussed. We study in detail two events (December 6, 2015 and November 24, 2015) of the generation of deeply modulated quasi-periodic VLF emiss...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2023-03-01
|
| Series: | Results in Physics |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211379723000840 |
| _version_ | 1797870585887326208 |
|---|---|
| author | P.A. Bespalov O.N. Savina G.M. Neshchetkin P.D. Zharavina |
| author_facet | P.A. Bespalov O.N. Savina G.M. Neshchetkin P.D. Zharavina |
| author_sort | P.A. Bespalov |
| collection | DOAJ |
| description | Some results of observations on board the Van Allen probe A spacecraft of atypical quasi-periodic VLF electromagnetic emissions inside the plasmasphere are discussed. We study in detail two events (December 6, 2015 and November 24, 2015) of the generation of deeply modulated quasi-periodic VLF emissions (QP) in the frequency band below 2kHz, when separate relatively short (on the order of 20 and 60 s) bursts of hiss without any notable frequency drift repeated with a period of 90 and 240s. The emissions selected for analysis were not accompanied by a hydromagnetic compression wave, which indicates the impossibility of their interpretation in terms of the concept of QP 1 modulated hiss. For the considered events, no clear periodicity of spectral bursts typical for QP 2 emissions take place. The dynamic spectra analysis makes it possible to conclude that the cyclotron generation of electromagnetic emissions occurs in the regions of the electron radiation belts with relatively dense cold plasma. The time course of these emissions can be explained under the assumption of a periodic modification of the conditions for the reflection of whistler wave incident on the ionosphere from above. Based on the available data and calculations, it was concluded that it is possible to interpret the analysed atypical quasi-periodic VLF emissions as a result of the resonant parametric action of ionospheric infrasonic waves with periods close to the repetition period of spectral bursts in quasi-periodic emissions. |
| first_indexed | 2024-04-10T00:29:43Z |
| format | Article |
| id | doaj.art-59e3ef6779704747bdae198c716ae6c1 |
| institution | Directory Open Access Journal |
| issn | 2211-3797 |
| language | English |
| last_indexed | 2024-04-10T00:29:43Z |
| publishDate | 2023-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Physics |
| spelling | doaj.art-59e3ef6779704747bdae198c716ae6c12023-03-15T04:27:50ZengElsevierResults in Physics2211-37972023-03-0146106291Quasi-periodic ELF/VLF emissions with atypical time structure inside the plasmasphereP.A. Bespalov0O.N. Savina1G.M. Neshchetkin2P.D. Zharavina3Corresponding author.; HSE University (National Research University Higher School of Economics), 25/12 Bolshaia Pecherskaja Ulitsa 603155, Nizhny Novgorod, RussiaHSE University (National Research University Higher School of Economics), 25/12 Bolshaia Pecherskaja Ulitsa 603155, Nizhny Novgorod, RussiaHSE University (National Research University Higher School of Economics), 25/12 Bolshaia Pecherskaja Ulitsa 603155, Nizhny Novgorod, RussiaHSE University (National Research University Higher School of Economics), 25/12 Bolshaia Pecherskaja Ulitsa 603155, Nizhny Novgorod, RussiaSome results of observations on board the Van Allen probe A spacecraft of atypical quasi-periodic VLF electromagnetic emissions inside the plasmasphere are discussed. We study in detail two events (December 6, 2015 and November 24, 2015) of the generation of deeply modulated quasi-periodic VLF emissions (QP) in the frequency band below 2kHz, when separate relatively short (on the order of 20 and 60 s) bursts of hiss without any notable frequency drift repeated with a period of 90 and 240s. The emissions selected for analysis were not accompanied by a hydromagnetic compression wave, which indicates the impossibility of their interpretation in terms of the concept of QP 1 modulated hiss. For the considered events, no clear periodicity of spectral bursts typical for QP 2 emissions take place. The dynamic spectra analysis makes it possible to conclude that the cyclotron generation of electromagnetic emissions occurs in the regions of the electron radiation belts with relatively dense cold plasma. The time course of these emissions can be explained under the assumption of a periodic modification of the conditions for the reflection of whistler wave incident on the ionosphere from above. Based on the available data and calculations, it was concluded that it is possible to interpret the analysed atypical quasi-periodic VLF emissions as a result of the resonant parametric action of ionospheric infrasonic waves with periods close to the repetition period of spectral bursts in quasi-periodic emissions.http://www.sciencedirect.com/science/article/pii/S2211379723000840VLF electromagnetic emissionsPlasma magnetospheric maserSpace plasma |
| spellingShingle | P.A. Bespalov O.N. Savina G.M. Neshchetkin P.D. Zharavina Quasi-periodic ELF/VLF emissions with atypical time structure inside the plasmasphere Results in Physics VLF electromagnetic emissions Plasma magnetospheric maser Space plasma |
| title | Quasi-periodic ELF/VLF emissions with atypical time structure inside the plasmasphere |
| title_full | Quasi-periodic ELF/VLF emissions with atypical time structure inside the plasmasphere |
| title_fullStr | Quasi-periodic ELF/VLF emissions with atypical time structure inside the plasmasphere |
| title_full_unstemmed | Quasi-periodic ELF/VLF emissions with atypical time structure inside the plasmasphere |
| title_short | Quasi-periodic ELF/VLF emissions with atypical time structure inside the plasmasphere |
| title_sort | quasi periodic elf vlf emissions with atypical time structure inside the plasmasphere |
| topic | VLF electromagnetic emissions Plasma magnetospheric maser Space plasma |
| url | http://www.sciencedirect.com/science/article/pii/S2211379723000840 |
| work_keys_str_mv | AT pabespalov quasiperiodicelfvlfemissionswithatypicaltimestructureinsidetheplasmasphere AT onsavina quasiperiodicelfvlfemissionswithatypicaltimestructureinsidetheplasmasphere AT gmneshchetkin quasiperiodicelfvlfemissionswithatypicaltimestructureinsidetheplasmasphere AT pdzharavina quasiperiodicelfvlfemissionswithatypicaltimestructureinsidetheplasmasphere |