13 Sep 2023
 | 13 Sep 2023
Status: this preprint is currently under review for the journal ANGEO.

Influence of Meteoric Smoke Particles on the Incoherent Scatter Measured with EISCAT VH

Tinna Lif Gunnarsdottir, Ingrid Mann, Wuhu Feng, Devin R. Huyghebaert, Ingemar Haeggstroem, Yasunobu Ogawa, Norihito Saito, Satonori Nozawa, and Takuya D. Kawahara

Abstract. Meteoric ablation in the Earth’s atmosphere produces particles of nanometer-size and larger. These particles can become charged and influence the charge balance in the D-region (60–90 km) and the incoherent scatter observed with radar from there. Radar studies have shown that if enough dust particles are charged, they can influence the received radar spectrum below 100 km, provided the electron density is sufficiently high (>109 m3). 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 ± 10–30 Hz. However, this did not lead to the best fit in all cases, especially not for the central part of the spectra in the narrow frequency range of ± 10 Hz. By including a negatively charged dust component, we obtained a better fit for spectra observed at altitudes 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 amount of free electrons, and observations at higher altitudes were limited by the height resolution of the observation. Inferred dust number densities range from a few particles up to 104 cm−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 model. However, these do not include charging, which is also based on models.

Tinna Lif Gunnarsdottir et al.

Status: open (until 25 Oct 2023)

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Tinna Lif Gunnarsdottir et al.

Tinna Lif Gunnarsdottir et al.


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Short summary
Several tons of meteoric particles burn up in our atmosphere each day. This deposits a great deal of material that bids with other atmospheric particles and forms so-called Meteoric Smoke Particles. These particles are assumed to influence radar measurements. Here we have compared radar measurements with simulations of a radar spectrum with and without dust particles and found that dust influences the radar spectrum in the altitude range of 75–85 km.