On the role of dust in the summer mesopause

O Havnes, U de Angelis, R Bingham, C.K Goertz, G.E Morfill, V Tsytovich

Research output: Contribution to journalArticle

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Abstract

We propose that dust formed at the cool summer mesopause may have optical properties very different from that measured for bulk material of ice. The smallness of the dust and possible surface impurities may lead to high photoelectric yields and low workfunctions. For such reasons the dust in the summer mesopause may, at least occasionally, be charged to substantial positive surface potentials while pure ice, with its high photoelectric workfunction, would be charged to low and negative potentials by collisions with plasma particles. The presence of 'dressed' dust particles, with surface potentials of some volts, can lead to enhanced radar backscatter. We also suggest that the apparent reductions in electron density ('bite-out'), which have been observed in the radar backscatter region, can be caused by the inability of an electrostatic probe to deflect the massive dust particles.The dust density which is required by our model to explain radar backscatter and electron bite-outs is of the order of 10 cm-3 for dust of radius above 5 × 10-6 cm.
LanguageEnglish
Pages637-643
Number of pages7
JournalJournal of Atmospheric and Terrestrial Physics
Volume52
Issue number6-8
DOIs
Publication statusPublished - Jun 1990

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mesopause
summer
dust
backscatter
radar
ice
electrostatic probes
optical property
electron density
collision
probe
plasma
optical properties
electron
impurities
collisions
radii

Keywords

  • dust
  • mesopause
  • optical properties

Cite this

Havnes, O., Angelis, U. D., Bingham, R., Goertz, C. K., Morfill, G. E., & Tsytovich, V. (1990). On the role of dust in the summer mesopause. Journal of Atmospheric and Terrestrial Physics, 52(6-8), 637-643. https://doi.org/10.1016/0021-9169(90)90058-U
Havnes, O ; Angelis, U de ; Bingham, R ; Goertz, C.K ; Morfill, G.E ; Tsytovich, V. / On the role of dust in the summer mesopause. In: Journal of Atmospheric and Terrestrial Physics. 1990 ; Vol. 52, No. 6-8. pp. 637-643.
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Havnes, O, Angelis, UD, Bingham, R, Goertz, CK, Morfill, GE & Tsytovich, V 1990, 'On the role of dust in the summer mesopause' Journal of Atmospheric and Terrestrial Physics, vol. 52, no. 6-8, pp. 637-643. https://doi.org/10.1016/0021-9169(90)90058-U

On the role of dust in the summer mesopause. / Havnes, O; Angelis, U de; Bingham, R; Goertz, C.K; Morfill, G.E; Tsytovich, V.

In: Journal of Atmospheric and Terrestrial Physics, Vol. 52, No. 6-8, 06.1990, p. 637-643.

Research output: Contribution to journalArticle

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T1 - On the role of dust in the summer mesopause

AU - Havnes, O

AU - Angelis, U de

AU - Bingham, R

AU - Goertz, C.K

AU - Morfill, G.E

AU - Tsytovich, V

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AB - We propose that dust formed at the cool summer mesopause may have optical properties very different from that measured for bulk material of ice. The smallness of the dust and possible surface impurities may lead to high photoelectric yields and low workfunctions. For such reasons the dust in the summer mesopause may, at least occasionally, be charged to substantial positive surface potentials while pure ice, with its high photoelectric workfunction, would be charged to low and negative potentials by collisions with plasma particles. The presence of 'dressed' dust particles, with surface potentials of some volts, can lead to enhanced radar backscatter. We also suggest that the apparent reductions in electron density ('bite-out'), which have been observed in the radar backscatter region, can be caused by the inability of an electrostatic probe to deflect the massive dust particles.The dust density which is required by our model to explain radar backscatter and electron bite-outs is of the order of 10 cm-3 for dust of radius above 5 × 10-6 cm.

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