164 research outputs found
Secondary charging effects due to icy dust particle impacts on rocket payloads
We report measurements of dust currents obtained with a small probe and a
larger probe during the flight of the ECOMA-4 rocket through the summer
polar mesosphere. The payload included two small dust probes behind a larger
dust probe located centrally at the front. For certain phases of the payload
rotation, the current registered by one of the small dust probes was up to 2
times the current measured with the larger probe, even though the effective
collection area of the larger probe was 4 times that of the small one. We
analyze the phase dependence of the currents and their difference with a
model based on the assumption that the small probe was hit by charged dust
fragments produced in collisions of mesospheric dust with the payload body.
Our results confirm earlier findings that secondary charge production in the
collision of a noctilucent cloud/Polar Summer Mesospheric Echo (NLC/PMSE)
dust particle with the payload body must be several orders of magnitude
larger than might be expected from laboratory studies of collisions of pure
ice particles with a variety of clean surfaces. An important consequence is
that for some payload configurations, one should not assume that the current
measured with a detector used to study mesospheric dust is simply
proportional to the number density of ambient dust particles. The higher
secondary charge production may be due to the NLC/PMSE particles containing
multiple meteoric smoke particles
Nanodust shedding and its potential influence on dust related phenomena in the mesosphere
We explore the possibility that some meteoric smoke particles that collide with larger nanoparticles near the mesopause can escape from the larger particles by capturing surface electrons. If the process were sufficiently efficient, under certain conditions it would influence the responses of polar mesospheric summer echoes to artificial heating in a manner that is compatible with observations that are unexplained with previous models. The process would have a number of other possible consequences for nanoparticles near the mesopause
Multi-scale measurements of mesospheric aerosols and electrons during the MAXIDUSTY campaign
We present in situ measurements of small-scale fluctuations in aerosol
populations as recorded through a mesospheric cloud system from the Faraday
cups DUSTY and MUDD during on the MAXIDUSTY-1 and 1B sounding rocket payloads
launched in the summer of 2016. Two mechanically identical DUSTY probes
mounted with an inter-spacing of âŒ10 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 to the negative aerosol charge density 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 polar mesospheric summer echo (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, shows that no simple proxy can
reproduce PMSE strength well throughout the cloud system. Edge effects are
especially poorly represented by the proxies addressed here.</p
Radiometric force in dusty plasmas
A radiofrequency glow discharge plasma, which is polluted with a certain
number of dusty grains, is studied. In addition to various dusty plasma
phenomena, several specific colloidal effects should be considered. We focus on
radiometric forces, which are caused by inhomogeneous temperature distribution.
Aside from thermophoresis, the role of temperature distribution in dusty
plasmas is an open question. It is shown that inhomogeneous heating of the
grain by ion flows results in a new photophoresis like force, which is specific
for dusty discharges. This radiometric force can be observable under conditions
of recent microgravity experiments.Comment: 4 pages, amsmat
First simultaneous rocket and radar detections of rare low summer mesospheric clouds
On 30 June 2016 a layer of dust, possibly meteoric smoke particles (MSPs), was observed with a rocket borne probe at 69.29°N, 16.02°E and altitudes of ~74 km where patchy thin cloud layers, detected with the Middle Atmosphere Alomar Radar System, were present. The rocket traversed a layer with a net positive dust charge density of ~10â· unit charges per cubic meters and a number density of neutral dust particles with sizes â„4 nm of ~10âž mâÂł. The positive charge density may require that elements that lower the photoelectric work function coat MSPs. The presence of this relatively large dust is consistent with smaller MSPs being swept out of the low mesospheric cloud region during the summer, while larger MSPs remain where their fall velocities equals the circulation updraught velocities. Large MSPs initially embedded in icy particles that subsequently sublimate may also fall until their fall velocities match the updraught velocities
Dusty Magnetohydrodynamics in Star Forming Regions
Star formation occurs in dark molecular regions where the number density of
hydrogen nuclei, nH, exceeds 10^4 cc and the fractional ionization is 10^-7 or
less. Dust grains with sizes ranging up to tenths of microns and perhaps down
to tens of nanometers contain just under one percent of the mass. Recombination
on grains is important for the removal of gas phase ions, which are produced by
cosmic rays penetrating the dark regions. Collisions of neutrals with charged
grains contribute significantly to the coupling of the magnetic field to the
neutral gas. Consequently, the dynamics of the grains must be included in the
magnetohydrodynamic models of large scale collapse, the evolution of waves and
the structures of shocks important in star formation.Comment: 17 pages, 3 figures, accepted for publication in the Journal of
Plasma Physics special issue in honour of Prof. Padma K. Shukl
Gravity compensation in complex plasmas by application of a temperature gradient
Micron sized particles are suspended or even lifted up in a gas by
thermophoresis. This allows the study of many processes occurring in strongly
coupled complex plasmas at the kinetic level in a relatively stress-free
environment. First results are presented. The technique is also of interest for
technological applications.Comment: 4 pages, 4 figures, final version to be published in Phys. Rev. Let
The radio lighthouse CU Virginis: the spindown of a single main sequence star
The fast rotating star CU Virginis is a magnetic chemically peculiar star
with an oblique dipolar magnetic field. The continuum radio emission has been
interpreted as gyrosyncrotron emission arising from a thin magnetospheric
layer. Previous radio observations at 1.4 GHz showed that a 100% circular
polarized and highly directive emission component overlaps to the continuum
emission two times per rotation, when the magnetic axis lies in the plane of
the sky. This sort of radio lighthouse has been proposed to be due to cyclotron
maser emission generated above the magnetic pole and propagating
perpendicularly to the magnetic axis. Observations carried out with the
Australia Telescope Compact Array at 1.4 and 2.5 GHz one year after this
discovery show that this radio emission is still present, meaning that the
phenomenon responsible for this process is steady on a timescale of years. The
emitted radiation spans at least 1 GHz, being observed from 1.4 to 2.5 GHz. On
the light of recent results on the physics of the magnetosphere of this star,
the possibility of plasma radiation is ruled out. The characteristics of this
radio lighthouse provides us a good marker of the rotation period, since the
peaks are visible at particular rotational phases. After one year, they show a
delay of about 15 minutes. This is interpreted as a new abrupt spinning down of
the star. Among several possibilities, a quick emptying of the equatorial
magnetic belt after reaching the maximum density can account for the magnitude
of the breaking. The study of the coherent emission in stars like CU Vir, as
well as in pre main sequence stars, can give important insight into the angular
momentum evolution in young stars. This is a promising field of investigation
that high sensitivity radio interferometers such as SKA can exploit.Comment: Accepted to MNRAS, 8 pages, 7 figures, updated versio
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