[PDF] Top 20 Observations of HF-induced instability in the auroral E region
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Observations of HF-induced instability in the auroral E region
... the observations from Rietveld et al. (2002) in the Tromsø E region can be ex- plained by the mechanism of mode conversion close to the reflection ...some observations of an absent lower ... See full document
6
Hf pump induced parametric instabilities in the auroral E region
... The long pulse was used to record ion line spectral data for analysis of background parameters. For the observations presented in this paper, we used 20 bits of a 32-bit alternating code with a baud length of 25 ... See full document
6
ANGEO - Investigation of the relationship between optical auroral forms and HF radar E region backscatter
... SuperDARN HF radars have been employed in the past to investigate the spectral characteristics of coherent backscatter from L-shell aligned features in the auroral E ...camera observations of ... See full document
10
ANGEO - Auroral E-region electron density gradients measured
... convection E ®eld and subsequently the E-region E B electron drift, is ...at E region altitudes is close to 3 ...Debye-length eects ... See full document
10
Nonlinear wave structures in collisional plasma of auroral E-region ionosphere
... the E and F regions in various geophysical conditions will be possible to predict within the frame of the theory present- ed, its further extensions to 3D and by its numerical ...the auroral and ... See full document
9
Multi-frequency observations of E-region HF radar aurora
... Multi-frequency observations of E-region coher- ent backscatter from decametre waves reveal that auroral echoes tend to comprise two spectral components superim- posed, one at low Doppler ... See full document
18
Multi-frequency observations of E-region HF radar aurora
... Multi-frequency observations of E-region coher- ent backscatter from decametre waves reveal that auroral echoes tend to comprise two spectral components superim- posed, one at low Doppler ... See full document
17
Towards a synthesis of substorm electrodynamics: HF radar and auroral observations
... using HF radars to study substorms, for example, one of the most sig- nificant complicating factors is the variability in the charac- teristics of radar backscatter ...by auroral precipitation can also give ... See full document
17
CUTLASS HF radar observations of high-velocity E-region echoes
... high-velocity E-region echo ob- servations by the Pykkvibaer HF radar is analysed to study echo parameters and the echo relation to the Farley-Buneman plasma ... See full document
14
First E region observations of mesoscale neutral wind interaction with auroral arcs
... [ 16 ] In this study, the coupled thermosphere ionosphere plasmasphere (CTIP) model [Fuller‐Rowell and Rees, 1980; Millward et al., 1996] was used to estimate the alti- tude of the SDI’s 557.7 nm observations and ... See full document
13
A classification of spectral populations observed in HF radar backscatter from the E region auroral electrojets
... of E region backscatter, and the interleaving of different channel-types within the ...of E region backscatter is observed, though the latitudes at which the backscatter is observed do not ... See full document
16
Cluster observations and theoretical identification of broadband waves in the auroral region
... 9 Discussion Two different methods are used to compare wave and parti- cle observations with theory, and to identify the wave modes. In both methods the observed wave polarization is com- pared with the ... See full document
14
Coordinated radar observations of plasma wave characteristics in the auroral F region
... F region backscatter power increases nearly mono- tonically with convection speed or, equivalently, with the electric field magnitude, with little evidence of sat- uration at the highest observed convection drifts ... See full document
14
Observations of nightside auroral plasma upflows in the F-region and topside ionosphere
... In terms of the magnitude of the maximum vertical ion velocity and the duration of the event, the upflow ob- served around 0030 UT is comparable with the earlier feature. However, in this case we observe only modest ... See full document
10
Interferometric identification of ion acoustic broadband waves in the auroral region: CLUSTER observations
... [16] We use the EFW instrument onboard the Cluster spacecraft to do an interferometric determination of the phase velocity and k vector of broadband ELF waves at an altitude of about 4.6 RE in the nightside ... See full document
5
Identification of broad-band waves above the auroral acceleration region: Cluster observations
... the auroral acceleration region but also reveals that the two components may have the high- est amplitude at somewhat different ...field E and B is plot- ted ...that E/B is above the speed of ... See full document
14
E-region echo characteristics governed by auroral arc electrodynamics
... Abstract. Observations of a pair of auroral arc features by two imagers, one ground- and one space-based, al- lows the associated field-aligned current (FAC) and elec- tric field structure to be ... See full document
9
Phenomena in the ionosphere-magnetosphere system induced by injection of powerful HF radio waves into nightside auroral ionosphere
... Tromsø HF pumping experiments in the nightside auroral ...the HF pump wave was reflected from the F 2 layer in contrast to other experiments, when the powerful wave was reflected from a sporadic ... See full document
14
HF wave propagation and induced ionospheric turbulence in the magnetic equatorial region
... equatorial region by high-frequency electromagnetic (EM) waves injected into the overhead ionospheric layer is ...two-stream instability and the three-wave parametric decay instability driving ... See full document
17
HF wave propagation and induced ionospheric turbulence in the magnetic equatorial region
... equatorial region by high-frequency electromagnetic (EM) waves injected into the overhead ionospheric layer is ...two-stream instability and the three-wave parametric decay instability driving ... See full document
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