Secondary electron emission from meteoric smoke particles inside the polar ionosphere

Baumann, Carsten; Rapp, Markus; Kero, Antti

doi:10.5194/angeo-34-573-2016

Cited by 6 publications

(4 citation statements)

References 36 publications

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“…An understanding of the behavior of free electrons as scatterers, which includes interactions with dust particles and responses to EPP, is crucial to clarifying the radio scattering process in the VHF range. Although further investigation into such behavior is beyond the scope of this study, it should be addressed by in situ measurements and by gaining an understanding of the ion‐chemical process by taking into account dust particles, especially for ionospherically disturbed periods in a more recent study (Baumann et al, , ).…”

Section: Discussionmentioning

confidence: 99%

Simultaneous Observations of Polar Mesosphere Winter Echoes and Cosmic Noise Absorptions in a Common Volume by the PANSY Radar (69.0°S, 39.6°E)

et al. 2018

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This study focuses on the one-to-one relationship between the morphology of polar mesosphere winter echo (PMWE) and cosmic noise absorption (CNA) as determined by measurements made with a single atmospheric radar, the Program of the Antarctic Syowa mesosphere-stratosphere-troposphere/incoherent scatter (PANSY) radar. CNA was calculated using the noise level in radar signal data collected during May 2013, including data of a solar proton event on 23 May. Using PMWE and CNA data in a common volume, their temporal variations and relation were examined in detail. PMWE altitude was clearly anticorrelated with CNA magnitude in a statistical sense: When a large CNA exceeding 0.50 dB took place, PMWE seemed to concentrate around 65 km and disappear above 70 km. The electron density behind the PMWE was estimated by using the ionospheric model for the auroral zone for the solar proton event. PMWE occurrence roughly coincided with a high electron density in the model, except that no PMWE was observed above 70 km at 0730 UT despite the electron density being higher than 10 8 m −3 . Additionally, the estimated radar volume reflectivity with the Schmidt number Sc less than or equal to 1 is qualitatively consistent with the observed PMWE. Although weak turbulent energy dissipation rate can also play a dominant role in the observed PMWE decay, a plausible mechanism was small Sc or reduction of Sc that is equal to an increase in electron diffusivity resulting from an unusually high electron density, which significantly reduced radar volume reflectivity above 70 km.

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Section: Discussionmentioning

confidence: 99%

Simultaneous Observations of Polar Mesosphere Winter Echoes and Cosmic Noise Absorptions in a Common Volume by the PANSY Radar (69.0°S, 39.6°E)

et al. 2018

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“…In fact, these two categories of particles are not completely distinct, as MSPs are subject to charging in the mesosphere, which can increase their efficiency as condensation nuclei (Gumbel and Megner, 2009). Charging mechanisms for MSPs comprise the capture of electrons and positive ions, photoionisation and/or electron detachment by solar photons, as well as secondary electron emission caused by energetic particle impact (Baumann et al, 2015(Baumann et al, , 2016(Baumann et al, , 2013. During the night, charge capture generally dominates, with more efficient capture of mobile free electrons compared with heavier ions.…”

Section: Cloud Microphysicsmentioning

confidence: 99%

Opinion: Recent developments and future directions in studying the mesosphere and lower thermosphere

Plane,

Gumbel,

Kalogerakis

et al. 2023

Atmos. Chem. Phys.

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Abstract. This article begins with a review of important advances in the chemistry and related physics of the mesosphere and lower thermosphere (MLT) region of the atmosphere that have occurred over the past 2 decades, since the founding of Atmospheric Chemistry and Physics. The emphasis here is on chemistry, but we also discuss recent findings on atmospheric dynamics and forcings to the extent that these are important for understanding MLT composition and chemistry. Topics that are covered include observations, with satellite, rocket and ground-based techniques; the variability and connectedness of the MLT on various length scales and timescales; airglow emissions; the cosmic dust input and meteoric metal layers; and noctilucent/polar mesospheric ice clouds. The paper then concludes with a discussion of important unanswered questions and likely future directions for the field over the next decade.

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“…In fact, these two categories of particles are not completely distinct as MSPs are subject to charging in the mesosphere, which can increase their efficiency as condensation nuclei (Gumbel and Megner, 2009). Charging mechanisms for MSPs comprise capture of electrons and positive ions, photoionization and/or electron detachment by solar photons, as well as secondary electron emission caused by energetic particle impact (Baumann et al, 2015;Baumann et al, 2016;Baumann et al, 2013). During the night, charge capture generally dominates, with more efficient capture of mobile free electrons compared with heavier ions.…”

Section: Ice Clouds In the Mesospherementioning

confidence: 99%

Opinion: Recent Developments and Future Directions in Studying the Chemistry of the Mesosphere and Lower Thermosphere

Plane

Gumbel

Kalogerakis

et al. 2023

Preprint

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Abstract. This Opinion article begins with a review of important advances in the science of the Mesosphere and Lower Thermosphere (MLT) region of the atmosphere that have occurred over the past two decades since the founding of Atmospheric Chemistry and Physics. The emphasis is on chemistry (although, of course, this cannot be decoupled from discussion of atmospheric physics and dynamics), and the primary focus is on work during the past 10 years. Topics that are covered include: observations (satellite, rocket and ground-based techniques); the variability and connectedness of the MLT on various length- and time-scales; airglow emissions; the cosmic dust input and meteoric metal layers; and noctilucent (or polar mesospheric) ice clouds. The paper then concludes with a discussion of important unanswered questions and likely future directions for the field over the next decade.

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Secondary electron emission from meteoric smoke particles inside the polar ionosphere

Cited by 6 publications

References 36 publications

Simultaneous Observations of Polar Mesosphere Winter Echoes and Cosmic Noise Absorptions in a Common Volume by the PANSY Radar (69.0°S, 39.6°E)

Simultaneous Observations of Polar Mesosphere Winter Echoes and Cosmic Noise Absorptions in a Common Volume by the PANSY Radar (69.0°S, 39.6°E)

Opinion: Recent developments and future directions in studying the mesosphere and lower thermosphere

Opinion: Recent Developments and Future Directions in Studying the Chemistry of the Mesosphere and Lower Thermosphere

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