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Towards a synthesis of substorm electrodynamics: HF radar and auroral observations

Towards a synthesis of substorm electrodynamics: HF radar and auroral observations

... onset of an interval of substorm activity was captured in the south- ern hemisphere by the Far UltraViolet (FUV) instrument on board the IMAGE ...onset of Pi2 activity and subsequent ... See full document

17

E-region echo characteristics governed by auroral arc electrodynamics

E-region echo characteristics governed by auroral arc electrodynamics

... Iceland HF radar, which forms part of the international SuperDARN radar network (Greenwald et ...tics of E-region backscatter, due to its favourable viewing ...minimum and ... See full document

9

Combined CUTLASS, EISCAT and ESR observations of ionospheric plasma flows at the onset of an isolated substorm

Combined CUTLASS, EISCAT and ESR observations of ionospheric plasma flows at the onset of an isolated substorm

... beams of separa- tion 3.24°. Each beam is gated into 75 range bins, each of length 45 km in standard ...azimuth and over 3000 km in range (an area of over 4 ´ 10 6 km 2 ), every 2 ...the ... See full document

15

On the collocation between dayside auroral activity and coherent HF radar backscatter

On the collocation between dayside auroral activity and coherent HF radar backscatter

... 2D observations of the developing and fading phases of the radar cusp activity then lead one to further examine the underlying working principles of radar cusp ...Coherent ... See full document

19

A Review of Ground Penetrating Radar Antenna Design and Optimization

A Review of Ground Penetrating Radar Antenna Design and Optimization

... type of waveform has a short period of time and a large ...types of antenna with this waveform. However, some types of antennas present some drawbacks when considering time-domain ... See full document

18

SOCIAL ECONOMY – A FORM OF INCLUSION AND OF ''REACTIVATING'' OF LABOR IN THE CONTEXT OF THE CURRENT CRISIS

SOCIAL ECONOMY – A FORM OF INCLUSION AND OF ''REACTIVATING'' OF LABOR IN THE CONTEXT OF THE CURRENT CRISIS

... essence of social economy is the inclusive function of the labor market through which the different forms of social economy that exist in the member states can play a role in the overcoming the ... See full document

13

Excitation of twin-vortex flow in the nightside high-latitude ionosphere during an isolated substorm

Excitation of twin-vortex flow in the nightside high-latitude ionosphere during an isolated substorm

... study of Sondre- strom radar data, Blanchard et ...1991 and Blanchard et ...position of the latter being estimated from ionospheric features observed by the radar and 630 nm au- ... See full document

25

Fingerprints of a riming event on cloud radar Doppler spectra: observations  and modeling

Fingerprints of a riming event on cloud radar Doppler spectra: observations and modeling

... sensitivity of the model simulations to sev- eral factors other that those we assume, because of a lack of additional observational ...profiling radar observations provide a height ... See full document

16

Observations of nightside auroral plasma upflows in the F-region and topside ionosphere

Observations of nightside auroral plasma upflows in the F-region and topside ionosphere

... number of observations of the nightside F-region and topside high-latitude ionosphere have re- vealed the existence of large upward field-aligned plasma ...Williams and Jain, ... See full document

10

Westward moving dynamic substorm features observed with the IMAGE magnetometer network and other ground-based instruments

Westward moving dynamic substorm features observed with the IMAGE magnetometer network and other ground-based instruments

... the auroral streamers gen- erate a variation predominantly in the eastward com- ponent when passing ...Because of the fast motion of the features, information obtained by a single magne- tometer is ... See full document

16

Typhoon 9707 observations with the MU radar and L-band boundary layer radar

Typhoon 9707 observations with the MU radar and L-band boundary layer radar

... Middle and Upper atmosphere (MU) radar, an L-band boundary layer radar (BLR), and a vertical-pointing C-band meteorological radar at the Shigaraki MU Observa- tory in Shiga prefecture, ... See full document

7

Evaluating the surface circulation in the Ebro delta (northeastern Spain) with quality-controlled high-frequency radar measurements

Evaluating the surface circulation in the Ebro delta (northeastern Spain) with quality-controlled high-frequency radar measurements

... characteristics of the received signal in order to implement advanced quality con- trols and reduce the systematic errors in radar current esti- mates (Kirincich et ...One of the radial ... See full document

15

Determination of Reliability Index and Weibull Modulus as a Measure of Hypereutectic Silumins Survival

Determination of Reliability Index and Weibull Modulus as a Measure of Hypereutectic Silumins Survival

... industry and aviation should, besides excellent mechanical properties, offer also stable and failure-free ...measure of the reliability of a selected examined property, ...estimation of ... See full document

4

Investigation of a mesospheric bore event over northern China

Investigation of a mesospheric bore event over northern China

... mesosphere and lower thermosphere (MLT) ...bright and dark areas. Dewan and Picard (1998) first inter- preted this phenomenon as a mesospheric bore using the hydraulic jump theory (Lighthill, 1978), ... See full document

10

Rev. Bras. Geof.  vol.27 número2

Rev. Bras. Geof. vol.27 número2

... evolutions of the geomagnetic Dst and auroral indices AU, AL, AE were examined in relation to interplanetary parameters for thirteen severe storms (Dst change exceeding 250 nT) during ...component ... See full document

13

EVOLUTION OF DST AND AURORAL INDICES DURING SOME SEVERE GEOMAGNETIC STORMS

EVOLUTION OF DST AND AURORAL INDICES DURING SOME SEVERE GEOMAGNETIC STORMS

... haywire and power grids can go down. The most outstanding example is of the March 13, 1989 event when the Hydro-Quebec (Canada) power grid went down for more than 9 hours, and the eastern ... See full document

13

Effect of water glass modification with nanoparticles of zinc oxide on selected physical and chemical properties of binder and mechanical properties of sand mixture

Effect of water glass modification with nanoparticles of zinc oxide on selected physical and chemical properties of binder and mechanical properties of sand mixture

... generation of materials are used in many ...down and bottom-up techniques. The essence of the top-down technique consists in grinding the material to particles with nano dimensions, while the ... See full document

4

Towards the improvement of cloud microphysical retrievals using simultaneous Doppler and polarimetric radar measurements

Towards the improvement of cloud microphysical retrievals using simultaneous Doppler and polarimetric radar measurements

... Typical radar-based retrievals only use the zero, first and second moments of the Doppler reflectivity spectrum, ...velocity and the Doppler width respectively. However, these radar ... See full document

16

Surface Morphology And Photoluminescence Properties Of A-GaAsSe Detector

Surface Morphology And Photoluminescence Properties Of A-GaAsSe Detector

... ROPERTIES OF GaAs:Se/ C -S I T HIN F ILM Figure (1) show the structure of GaAs:Se thin films that have been deposited on glass substrates and annealed at RT ,373 and 473 K with thicknesses ... See full document

3

High resolution observations of sporadic-E layers within the polar cap ionosphere using a new incoherent scatter radar experiment

High resolution observations of sporadic-E layers within the polar cap ionosphere using a new incoherent scatter radar experiment

... resolution observations of sporadic-E layers using a new experiment with the EISCAT (European Inco- herent SCATter) Svalbard radar (ESR) are ...The observations were made by means of a ... See full document

10

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