Influence of meteoric smoke particles on the incoherent scatter measured with EISCAT VHF

Abstract > 10 9 3). Here, we study an observation made with the EISCAT VHF radar on 9 January 2014 during strong particle precipitation so that incoherent scatter was observed down to almost 60 km altitude. We found that the measured spectra were too narrow in comparison to the calculated spectra. Adjusting the collision frequency provided a better fit in the frequency range of ± ± 10  Hz. By including a negatively charged dust component, we obtained a better fit for spectra observed at altitudes of 75–85 km, indicating that dust influences the incoherent-scatter spectrum at D-region altitudes. The observations at lower altitudes were limited by the small number of free electrons, and observations at higher altitudes were limited by the height resolution of the observations. Inferred dust number densities range from a few particles up to 10 4 - 3, and average sizes range from approximately 0.6 to 1 nm. We find an acceptable agreement with the dust profiles calculated with the WACCM-CARMA (Whole Atmosphere Community Climate Model-Community Aerosol Radiation Model for Atmospheres) model. However, these do not include charging, which is also based on models.

Angaben zum Objekt

• Standort: Deutsche Nationalbibliothek Frankfurt am Main
• Umfang: Online-Ressource
• Sprache: Englisch

Verweise und Beziehungen

• Erschienen in: Influence of meteoric smoke particles on the incoherent scatter measured with EISCAT VHF ; volume:42 ; number:1 ; year:2024 ; pages:213-228 ; extent:16 ; Annales geophysicae ; 42, Heft 1 (2024), 213-228 (gesamt 16)

Beteiligte, Orts- und Zeitangaben

• Urheber: Gunnarsdottir, Tinna L. ; Mann, Ingrid ; Feng, Wuhu ; Huyghebaert, Devin R. ; Haeggstroem, Ingemar ; Ogawa, Yasunobu ; Saito, Norihito ; Nozawa, Satonori ; Kawahara, Takuya D.

Weitere Informationen

• DOI: 10.5194/angeo-42-213-2024
• URN: urn:nbn:de:101:1-2406060414270.982614349584
• Rechteinformation: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Letzte Aktualisierung: 14.08.2025, 10:51 MESZ