Experimental evidence of the simultaneous occurrence of VLF chorus on the ground in the global azimuthal scale – from pre-midnight to the late morning
Night-time VLF (very low frequency) chorus bursts lasting about one hour have been recorded at Finnish temporal station Kannuslehto (CGM: 64.2°; 107.9°, <I>L</I> = 5.3) during two VLF campaigns (on 25 February–4 March 2008 and 27 March–17 April 2011). The chorus bursts were associated...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2012-04-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/30/725/2012/angeo-30-725-2012.pdf |
| _version_ | 1828730525180755968 |
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| author | J. Manninen N. G. Kleimenova O. V. Kozyreva M. Parrot T. Raita T. Turunen |
| author_facet | J. Manninen N. G. Kleimenova O. V. Kozyreva M. Parrot T. Raita T. Turunen |
| author_sort | J. Manninen |
| collection | DOAJ |
| description | Night-time VLF (very low frequency) chorus bursts lasting about one hour have been recorded at
Finnish temporal station Kannuslehto (CGM: 64.2°; 107.9°, <I>L</I> = 5.3)
during two VLF campaigns (on 25 February–4 March 2008 and 27 March–17
April 2011). The chorus bursts were associated with substorm development.
They were accompanied by riometer absorption enhancements, which occurred
simultaneously within as large longitude areas as from pre-midnight
(Sodankylä, ~22:00 MLT) to the late morning (Tixie, ~03:00 MLT
and Gakona, ~08:00 MLT) longitudes. It was found that the pre-midnight
chorus observed on the ground occurred simultaneously with VLF chorus
emissions recorded in the late morning on the low-altitude DEMETER satellite
crossing the similar geomagnetic latitudes on the opposite local time
sector. For the first time some evidence of simultaneous chorus burst
generation in the global longitudinal scale was found (from pre-midnight to
the late morning) by using direct comparison with satellite data as well as
using non-direct indicator–azimuthally extended riometer absorption
enhancements. |
| first_indexed | 2024-04-12T17:31:25Z |
| format | Article |
| id | doaj.art-d472639f9eb64399b1b19fdec179c96d |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-04-12T17:31:25Z |
| publishDate | 2012-04-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-d472639f9eb64399b1b19fdec179c96d2022-12-22T03:23:07ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762012-04-013072573210.5194/angeo-30-725-2012Experimental evidence of the simultaneous occurrence of VLF chorus on the ground in the global azimuthal scale – from pre-midnight to the late morningJ. Manninen0N. G. Kleimenova1O. V. Kozyreva2M. Parrot3T. Raita4T. Turunen5Sodankylä Geophysical Observatory, FinlandInstitute of the Earth Physics RAS, Moscow, RussiaInstitute of the Earth Physics RAS, Moscow, RussiaLPC2E/CNRS, Orléans, FranceSodankylä Geophysical Observatory, FinlandSodankylä Geophysical Observatory, FinlandNight-time VLF (very low frequency) chorus bursts lasting about one hour have been recorded at Finnish temporal station Kannuslehto (CGM: 64.2°; 107.9°, <I>L</I> = 5.3) during two VLF campaigns (on 25 February–4 March 2008 and 27 March–17 April 2011). The chorus bursts were associated with substorm development. They were accompanied by riometer absorption enhancements, which occurred simultaneously within as large longitude areas as from pre-midnight (Sodankylä, ~22:00 MLT) to the late morning (Tixie, ~03:00 MLT and Gakona, ~08:00 MLT) longitudes. It was found that the pre-midnight chorus observed on the ground occurred simultaneously with VLF chorus emissions recorded in the late morning on the low-altitude DEMETER satellite crossing the similar geomagnetic latitudes on the opposite local time sector. For the first time some evidence of simultaneous chorus burst generation in the global longitudinal scale was found (from pre-midnight to the late morning) by using direct comparison with satellite data as well as using non-direct indicator–azimuthally extended riometer absorption enhancements.https://www.ann-geophys.net/30/725/2012/angeo-30-725-2012.pdf |
| spellingShingle | J. Manninen N. G. Kleimenova O. V. Kozyreva M. Parrot T. Raita T. Turunen Experimental evidence of the simultaneous occurrence of VLF chorus on the ground in the global azimuthal scale – from pre-midnight to the late morning Annales Geophysicae |
| title | Experimental evidence of the simultaneous occurrence of VLF chorus on the ground in the global azimuthal scale – from pre-midnight to the late morning |
| title_full | Experimental evidence of the simultaneous occurrence of VLF chorus on the ground in the global azimuthal scale – from pre-midnight to the late morning |
| title_fullStr | Experimental evidence of the simultaneous occurrence of VLF chorus on the ground in the global azimuthal scale – from pre-midnight to the late morning |
| title_full_unstemmed | Experimental evidence of the simultaneous occurrence of VLF chorus on the ground in the global azimuthal scale – from pre-midnight to the late morning |
| title_short | Experimental evidence of the simultaneous occurrence of VLF chorus on the ground in the global azimuthal scale – from pre-midnight to the late morning |
| title_sort | experimental evidence of the simultaneous occurrence of vlf chorus on the ground in the global azimuthal scale from pre midnight to the late morning |
| url | https://www.ann-geophys.net/30/725/2012/angeo-30-725-2012.pdf |
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