scholarly journals Flow angle dependence of 1-m ionospheric plasma wave turbulence for near-threshold radar echo electric fields

2002 ◽  
Vol 107 (A10) ◽  
Author(s):  
E. E. Timofeev
Keyword(s):  
Plasma Wave ◽  
Electric Fields ◽  
Ionospheric Plasma ◽  
Wave Turbulence ◽  
Flow Angle ◽  
Angle Dependence ◽  
Radar Echo ◽  
Near Threshold

The polar-angle dependence in π+ electroproduction near threshold

1974 ◽  
Vol 11 (3) ◽  
pp. 248-248
Author(s):  
D. R. Botteril ◽  
D. W. Braben ◽  
P. R. Norton ◽  
A. Del Guerra ◽  
A. Giazotto ◽  
...  
Keyword(s):  
Polar Angle ◽  
Angle Dependence ◽  
Near Threshold

scholarly journals Imaging radar observations of Farley Buneman waves during the JOULE II experiment

2008 ◽  
Vol 26 (7) ◽  
pp. 1837-1850 ◽  
Author(s):  
D. L. Hysell ◽  
G. Michhue ◽  
M. F. Larsen ◽  
R. Pfaff ◽  
M. Nicolls ◽  
...  
Keyword(s):  
Electric Fields ◽  
Spectral Width ◽  
Auroral Zone ◽  
Convection Flow ◽  
Coherent Scatter ◽  
Flow Angle ◽  
Doppler Shifts ◽  
Ion Acoustic ◽  
The Waves ◽  
Acoustic Speed

Abstract. Vector electric fields and associated E×B drifts measured by a sounding rocket in the auroral zone during the NASA JOULE II experiment in January 2007, are compared with coherent scatter spectra measured by a 30 MHz radar imager in a common volume. Radar imaging permits precise collocation of the spectra with the background electric field. The Doppler shifts and spectral widths appear to be governed by the cosine and sine of the convection flow angle, respectively, and also proportional to the presumptive ion acoustic speed. The neutral wind also contributes to the Doppler shifts. These findings are consistent with those from the JOULE I experiment and also with recent numerical simulations of Farley Buneman waves and instabilities carried out by Oppenheim et al. (2008). Simple linear analysis of the waves offers some insights into the spectral moments. A formula relating the spectral width to the flow angle, ion acoustic speed, and other ionospheric parameters is derived.

Plasma wave turbulence at Jupiter's bow shock

Nature ◽  
1979 ◽  
Vol 280 (5725) ◽  
pp. 796-797 ◽  
Author(s):  
F. L. Scarf ◽  
D. A. Gurnett ◽  
W. S. Kurth ◽  
R. L. Poynter
Keyword(s):  
Plasma Wave ◽  
Bow Shock ◽  
Wave Turbulence

The polar-angle dependence in $$\pi ^ + $$ electroproduction near thresholdelectroproduction near threshold

1974 ◽  
Vol 10 (14) ◽  
pp. 629-632 ◽  
Author(s):  
D. R. Botterill ◽  
D. W. Braben ◽  
P. R. Norton ◽  
A. Del Guerra ◽  
A. Giazotto ◽  
...  
Keyword(s):  
Polar Angle ◽  
Angle Dependence ◽  
Near Threshold

scholarly journals Pitch angle distribution of relativistic electrons in the inner radiation belt and its relation to equatorial plasma wave turbulence phenomena

2001 ◽  
Vol 28 (5) ◽  
pp. 931-934 ◽  
Author(s):  
Akira Morioka ◽  
Hiroaki Misawa ◽  
Yoshizumi Miyoshi ◽  
Hiroshi Oya ◽  
Masahide Iizima ◽  
...  
Keyword(s):  
Plasma Wave ◽  
Pitch Angle ◽  
Radiation Belt ◽  
Wave Turbulence ◽  
Relativistic Electrons ◽  
Angle Distribution ◽  
Pitch Angle Distribution

Plasma wave turbulence around the shuttle: Results from the Spacelab-2 flight

1988 ◽  
Vol 15 (8) ◽  
pp. 760-763 ◽  
Author(s):  
D. A. Gurnett ◽  
W. S. Kurth ◽  
J. T. Steinberg ◽  
S. D. Shawhan
Keyword(s):  
Plasma Wave ◽  
Wave Turbulence

Glow discharge excited at low to high radio frequencies around active dipoles in the ionosphere

2020 ◽  
Author(s):  
H.G. James ◽  
Andrew W. Yau
Keyword(s):  
Glow Discharge ◽  
Radio Frequency ◽  
Electric Fields ◽  
Ionospheric Plasma ◽  
Optical Emission ◽  
Video Camera ◽  
Sounding Rocket ◽  
Dipole Antennas ◽  
Radio Frequency Glow Discharge ◽  
Frequency Dependences

Abstract: We present the first space-borne observation of optical emissions of both neutral and ionized argon atoms resulting from a radio-frequency glow discharge (RF-GD) from a sounding rocket payload. The Observations of Electric-field Distributions in the Ionospheric Plasma - a Unique Strategy-C (OEDIPUS-C) payload was designed to separate into two sub-payloads on its up-leg. This separation permitted a number of two-point measurements, including those on radio wave propagation from the active dipole antennas on the upper sub-payload to the synchronized receiving dipoles on the lower sub-payload. A white-light video camera on the lower sub-payload recorded strong luminosity around the active dipoles during the first 15 s after sub-payload separation, when argon gas jets were providing propulsion to separate the two sub-payloads. Parts of the ejected argon appeared as a glowing volume where the large radio-frequency (RF) fields from the two active dipoles excited the optical emission, as the sub-payload separation increased from 2 to 55 m. The shape and intensity of the luminosity were well repeated as a function of the swept frequency (0.025 - 8.000 MHz), but their frequency dependences were distinctly different from those of sounder accelerated electrons measured onboard, and deduced to result from the nonlinearity of the glow discharge. The observation is to our knowledge the first of its kind, and is interpreted in terms of a RF-GD energized by the strong near electric fields of the transmitting dipoles.

scholarly journals The MEFISTO and WPT Electric Field Sensors of the Plasma Wave Investigation on the BepiColombo Mio Spacecraft

2020 ◽  
Vol 216 (8) ◽  
Author(s):  
T. Karlsson ◽  
Y. Kasaba ◽  
J.-E. Wahlund ◽  
P. Henri ◽  
L. Bylander ◽  
...  
Keyword(s):  
Electric Field ◽  
Plasma Wave ◽  
Electric Fields ◽  
Field Measurements ◽  
Antenna Element ◽  
Radio Waves ◽  
Frequency Range ◽  
Dipole Antennas ◽  
Electric Field Sensors ◽  
Electric Field Measurements

AbstractThis paper describes the design of MEFISTO (Mercury Electric Field In-Situ Tool) and WPT (Wire Probe Antenna) electric field sensors for Plasma Wave Investigation (PWI) on the BepiColombo Mio spacecraft (Mercury Magnetospheric Orbiter, MMO). The two sensors will enable the first observations of electric fields, plasma waves and radio waves in and around the Hermean magnetosphere and exosphere. MEFISTO and WPT are dipole antennas with 31.6 m tip-to-tip length. Each antenna element has a spherical probe at each end of the wire (15 m length). They are extended orthogonally in the spin plane of the spacecraft and enable measurements of the electric field in the frequency range of DC to 10 MHz by the connection to two sets of receivers, EWO for a lower frequency range and SORBET for higher frequencies. In the initial operations after the launch (20 Oct. 2018), we succeeded to confirm the health of both antennas and to release the launch lock of the WPT. After Mercury orbit insertion planned at the end of 2025, both sensors will be fully deployed and activate full operations of the PWI electric field measurements.

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