Estimates of the Size Distribution of Meteoric Smoke Particles From Rocket‐Borne Impact Probes

Antonsen, Tarjei; Havnes, O.; Mann, Ingrid

doi:10.1002/2017jd027220

Cited by 15 publications

(22 citation statements)

References 37 publications

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“…CC BY 4.0 License. Havnes et al (2014); Antonsen and Havnes (2015); Antonsen et al (2017)) with similar interspacing, confirm the DUSTY measurements and display a similar difference between probe currents. A comparison between electron currents from needle Langmuir probes (U. of Oslo) shows that the correlation is generally clearly negative between dust number densities and electron densities, but in some regions of the cloud system the correlation is more variable and not as unambiguous.…”

Section: Small-scale Measurements In the Mesopause Regionsupporting

confidence: 77%

Multi-scale Measurements of Mesospheric Aerosols and Electrons During the MAXIDUSTY Campaign

Antonsen¹,

Havnes²,

Spicher³

2018

Preprint

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Abstract. We present measurements of small scale fluctuations in aerosol populations as recorded through a mesospheric cloud system by the Faraday cups DUSTY and MUDD during the MAXIDUSTY-1B flight on the 8th of July, 2016. Two mechanically identical DUSTY probes mounted with an inter-spacing of ~ 10 cm, recorded very different currents, with strong spin modulation, in certain regions of the cloud system. A comparison to auxiliary measurement show similar tendencies in the MUDD data. Fluctuations in the electron density are found to be generally anti-correlated on all length scales, however, in certain smaller regions the correlation turns positive. We have also compared the spectral properties of the dust fluctuations, as extracted by wavelet analysis, to PMSE strength. In this analysis, we find a relatively good agreement between the power spectral density (PSD) at the radar Bragg scale inside the cloud system, however the PMSE edge is not well represented by the PSD. A comparison of proxies for PMSE strength, constructed from a combination of derived dusty plasma parameters, show that no simple proxy can reproduce PMSE strength well throughout the cloud system. Edge effects are especially poorly represented by the proxies addressed here.

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Section: Small-scale Measurements In the Mesopause Regionsupporting

confidence: 77%

Multi-scale Measurements of Mesospheric Aerosols and Electrons During the MAXIDUSTY Campaign

Antonsen¹,

Havnes²,

Spicher³

2018

Preprint

Self Cite

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show abstract

“…Gumbel and Megner, 2009;Keesee, 1989; Rapp and Thomas, 2006;Turco et al, 1982). This conjecture is strongly supported by satellite and rocket born observations showing that MSPs are included in PMC ice particles (Antonsen et al, 2017;Havnes et al, 2014;Hervig et al, 2012). The initial ice particle formation has been described in two different ways.…”

Section: Introductionmentioning

confidence: 57%

The impact of solar radiation on polar mesospheric ice particle formation

Nachbar¹,

Wilms²,

Duft³

et al. 2018

Preprint

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Abstract. Mean temperatures in the polar summer mesopause can drop to 130&#8201;K. The cold temperatures in combination with water vapor mixing ratios of a few parts per million give rise to the formation of ice particles. These ice particles may be observed as polar mesospheric clouds. Mesospheric ice cloud formation is believed to initiate heterogeneously on small aerosol particles (r&#8201;<&#8201;2&#8201;nm) composed of re-condensed meteoric material, so called Meteoric Smoke Particles (MSPs). Recently, we investigated the ice activation and growth behavior of MSP analogues under realistic mesopause conditions. Based on these measurements we presented a new activation model which largely reduced the uncertainties in describing ice particle formation. However, this activation model neglected the possibility that MSPs heat up in the low density mesopause due to absorption of solar and terrestrial irradiation. Radiative heating of the particles may severely reduce their ice formation ability. In this study we expose MSP analogues (Fe2O3 and FexSi1-xO3) to realistic mesopause temperatures and water vapor concentrations and investigate particle warming under the influence of variable intensities of visible light (405, 488, and 660&#8201;nm). We show that Mie theory calculations using refractive indices of bulk material from the literature combined with an equilibrium temperature model presented in this work predict the particle warming very well. Additionally, we confirm that the absorption efficiency increases with the iron content of the MSP material. We apply our findings to mesopause conditions and conclude that the impact of solar and terrestrial radiation on ice particle formation is significantly lower than previously assumed.

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“…Ice particle formation is believed to initiate heterogeneously on nanometer-sized recondensed meteoric material, so-called meteoric smoke particles (MSPs) (e.g., Gumbel and Megner, 2009;Keesee, 1989;Rapp and Thomas, 2006;Turco et al, 1982). This conjecture is strongly supported by satellite and rocket-borne observations showing that MSPs are included in PMC ice particles (Antonsen et al, 2017;Havnes et al, 2014;Hervig et al, 2012). The initial ice particle formation has been described in two different ways.…”

Section: Introductionmentioning

confidence: 98%

The impact of solar radiation on polar mesospheric ice particle formation

et al. 2019

View full text Add to dashboard Cite

Abstract. Mean temperatures in the polar summer mesopause can drop to 130 K. The low temperatures in combination with water vapor mixing ratios of a few parts per million give rise to the formation of ice particles. These ice particles may be observed as polar mesospheric clouds. Mesospheric ice cloud formation is believed to initiate heterogeneously on small aerosol particles (r<2 nm) composed of recondensed meteoric material, so-called meteoric smoke particles (MSPs). Recently, we investigated the ice activation and growth behavior of MSP analogues under realistic mesopause conditions. Based on these measurements we presented a new activation model which largely reduced the uncertainties in describing ice particle formation. However, this activation model neglected the possibility that MSPs heat up in the low-density mesopause due to absorption of solar and terrestrial irradiation. Radiative heating of the particles may severely reduce their ice formation ability. In this study we expose MSP analogues (Fe2O3 and FexSi1−xO3) to realistic mesopause temperatures and water vapor concentrations and investigate particle warming under the influence of variable intensities of visible light (405, 488, and 660 nm). We show that Mie theory calculations using refractive indices of bulk material from the literature combined with an equilibrium temperature model presented in this work predict the particle warming very well. Additionally, we confirm that the absorption efficiency increases with the iron content of the MSP material. We apply our findings to mesopause conditions and conclude that the impact of solar and terrestrial radiation on ice particle formation is significantly lower than previously assumed.

show abstract

Estimates of the Size Distribution of Meteoric Smoke Particles From Rocket‐Borne Impact Probes

Cited by 15 publications

References 37 publications

Multi-scale Measurements of Mesospheric Aerosols and Electrons During the MAXIDUSTY Campaign

Multi-scale Measurements of Mesospheric Aerosols and Electrons During the MAXIDUSTY Campaign

The impact of solar radiation on polar mesospheric ice particle formation

The impact of solar radiation on polar mesospheric ice particle formation

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