scholarly journals Equatorial F ‐Region Plasma Waves and Instabilities Observed Near Midnight at Solar Minimum During the NASA Too WINDY Sounding Rocket Experiment

2020 ◽  
Vol 125 (9) ◽  
Author(s):  
D. L. Hysell ◽  
S. Rao ◽  
M. F. Larsen
Keyword(s):  
Solar Minimum ◽  
Plasma Waves ◽  
Sounding Rocket ◽  
F Region ◽  
Plasma Waves And Instabilities ◽  
Rocket Experiment ◽  
Region Plasma

scholarly journals Auroral ion outflow: low altitude energization

2007 ◽  
Vol 25 (9) ◽  
pp. 1967-1977 ◽  
Author(s):  
K. A. Lynch ◽  
J. L. Semeter ◽  
M. Zettergren ◽  
P. Kintner ◽  
R. Arnoldy ◽  
...  
Keyword(s):  
Electron Temperature ◽  
Scale Height ◽  
Electron Precipitation ◽  
Sounding Rocket ◽  
Time Varying ◽  
Ion Outflow ◽  
F Region ◽  
Low Energies ◽  
Moderate Energy ◽  
Low Altitude

Abstract. The SIERRA nightside auroral sounding rocket made observations of the origins of ion upflow, at topside F-region altitudes (below 700 km), comparatively large topside plasma densities (above 20 000/cc), and low energies (10 eV). Upflowing ions with bulk velocities up to 2 km/s are seen in conjunction with the poleward edge of a nightside substorm arc. The upflow is limited within the poleward edge to a region (a) of northward convection, (b) where Alfvénic and Pedersen conductivities are well-matched, leading to good ionospheric transmission of Alfvénic power, and (c) of soft electron precipitation (below 100 eV). Models of the effect of the soft precipitation show strong increases in electron temperature, increasing the scale height and initiating ion upflow. Throughout the entire poleward edge, precipitation of moderate-energy (100s of eV) protons and oxygen is also observed. This ion precipitation is interpreted as reflection from a higher-altitude, time-varying field-aligned potential of upgoing transversely heated ion conics seeded by the low altitude upflow.

scholarly journals Electron heating by HF pumping of high-latitude ionospheric F-region plasma near magnetic zenith

2020 ◽  
Vol 38 (2) ◽  
pp. 297-307 ◽  
Author(s):  
Thomas B. Leyser ◽  
Björn Gustavsson ◽  
Theresa Rexer ◽  
Michael T. Rietveld
Keyword(s):  
Electron Temperature ◽  
Pump Beam ◽  
Electron Heating ◽  
Incoherent Scatter ◽  
F Region ◽  
Left Handed ◽  
Parameter Values ◽  
Uhf Radar ◽  
Region Plasma ◽  
Magnetic Zenith

Abstract. High-frequency electromagnetic pumping of ionospheric F-region plasma at high and mid latitudes gives the strongest plasma response in magnetic zenith, antiparallel to the geomagnetic field in the Northern Hemisphere. This has been observed in optical emissions from the pumped plasma turbulence, electron temperature enhancements, filamentary magnetic field-aligned plasma density irregularities, and in self-focusing of the pump beam in magnetic zenith. We present results of EISCAT (European Incoherent SCATter association) Heating-induced magnetic-zenith effects observed with the EISCAT UHF incoherent scatter radar. With heating transmitting a left-handed circularly polarized pump beam towards magnetic zenith, the UHF radar was scanned in elevation in steps of 1.0 and 1.5∘ around magnetic zenith. The electron energy equation was integrated to model the electron temperature and associated electron heating rate and optimized to fit the plasma parameter values measured with the radar. The experimental and modelling results are consistent with pump wave propagation in the L mode in magnetic zenith, rather than in the O mode.

Relationship between generation of equatorial F-region plasma bubbles and thermospheric dynamics

1995 ◽  
Vol 16 (5) ◽  
pp. 117-120 ◽  
Author(s):  
P.R Fagundes ◽  
Y Sahai ◽  
J.A Bittencourt ◽  
H Takahashi
Keyword(s):  
Plasma Bubbles ◽  
F Region ◽  
Thermospheric Dynamics ◽  
Region Plasma
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