Unexpected Very Low Frequency (VLF) Radio Events Recorded by the Ionospheric Satellite DEMETER
- 485 Downloads
DEMETER was a low Earth orbiting microsatellite in operation between July 2004 and December 2010. Its scientific objective was the study of ionospheric perturbations in relation to seismic activity and man-made activities. Its payload was designed to measure electromagnetic waves over a large frequency range as well as ionospheric plasma parameters (electron and ion densities, fluxes of energetic charged particles). This paper will show both expected and unusual events recorded by the satellite when it was in operation. These latter events have been selected from the DEMETER database because they are rare or even have never been observed before, because they have a very high intensity, or because they are related to abnormalities of the experiments under particular plasma conditions. Some events are related to man-made radio waves emitted by VLF ground-based transmitters or power line harmonic radiation. Natural waves, such as atypical quasi-periodic emissions or uncommon whistlers, are also shown.
KeywordsIonosphere Natural and man-made VLF radio emissions Anomalies
DEMETER was a CNES mission. We thank the engineers from CNES and scientific laboratories (CBK, IRAP, LPC2E, LPP, SSD of ESTEC) who largely contributed to the success of this mission. Thanks are also due to many students who carefully scrutinized the DEMETER data during their summer jobs. OS and DP acknowledge funding from projects M100421206, GACR14-31899S, and LH12231. FN was supported by GACR Grant P209/12/P658. The work of TO was supported through the IODISSEE ANR grant.
- Dao E, Kelley MC, Roddy P, Retterer J, Ballenthin JO, de La Beaujardiere O, Su YJ (2011) Longitudinal and seasonal dependence of nighttime equatorial plasma density irregularities during solar minimum detected on the C/NOFS satellite. Geophys Res Lett 38:L10104. doi: 10.1029/2011GL047046 Google Scholar
- Huang C-S, de La Beaujardiere O, Roddy PA, Hunton DE, Liu JY, Chen SP (2014) Occurrence probability and amplitude of equatorial ionospheric irregularities associated with plasma bubbles during low and moderate solar activities (2008–2012). J Geophys Res Space Phys 119:1186–1199. doi: 10.1002/2013JA019212 CrossRefGoogle Scholar
- Lagoutte D, Berthelier JJ, Lebreton JP, Parrot M, Sauvaud JA (2005) DEMETER microsatellite-scientific mission center-data user guide. DMT-OP-7-CS-6124-LPC v1.0Google Scholar
- Lagoutte D, Brochot JY, de Carvalho D, Elie F, Harivelo F, Hobara Y, Madrias L, Parrot M, Pinçon JL, Berthelier JJ, Peschard D, Seran E, Gangloff M, Sauvaud JA, Lebreton JP, Stverak S, Travnicek P, Grygorczuk J, Slominski J, Wronowski R, Barbier S, Bernard P, Gaboriaud A, Wallut JM (2006) The DEMETER science mission centre. Planet Space Sci 54(5):428–440CrossRefGoogle Scholar
- Lebreton JP, Stverak S, Travnicek P, Maksimovic M, Klinge D, Merikallio S, Lagoutte D, Poirier B, Kozacek Z, Salaquarda M (2006) The ISL Langmuir probe experiment and its data processing onboard DEMETER: scientific objectives, description and first results. Planet Space Sci 54(5):472–486CrossRefGoogle Scholar
- Malingre M, Berthelier JJ, Pfaff R, Jasperse J, Parrot M (2008) Lightning-induced lower-hybrid turbulence and trapped extremely low frequency (ELF) electromagnetic waves observed in deep equatorial plasma density depletions during intense magnetic storms. J Geophys Res 113:A11320. doi: 10.1029/2008JA013463 CrossRefGoogle Scholar
- Manninen J (2005) Some aspects of ELF–VLF emissions in geophysical research, vol 98. Oulu University Press, OuluGoogle Scholar
- Pfaff R, Liebrecht C, Berthelier JJ, Malingre M, Parrot M, Lebreton JP (2008) DEMETER satellite observations of plasma irregularities in the topside ionosphere at low, middle, and sub-auroral latitudes and their dependence on magnetic storms. In Kintner et al (eds) Midlatitude ionospheric dynamics and disturbances, vol 181. AGU Monograph, pp 297–310Google Scholar
- Píša D (2012) Etude des émissions électromagnétiques enregistrées par le satellite DEMETER. PhD thesis, University of Orléans, October 16, 2012Google Scholar