Satellite measurements of high latitude convection electric fields

1972 ◽  
Vol 13 (3) ◽  
Author(s):  
DavidP. Cauffman ◽  
DonaldA. Gurnett
Keyword(s):  
Electric Fields ◽  
High Latitude ◽  
Satellite Measurements

Ground-based observations coordinated with Viking satellite measurements

1989 ◽  
Vol 328 (1598) ◽  
pp. 221-233 ◽  
Keyword(s):  
Electric Fields ◽  
Temporal Resolution ◽  
Dense Network ◽  
Satellite Measurements ◽  
Satellite Mission ◽  
Incoherent Scatter ◽  
Routine Basis ◽  
First Results ◽  
Eiscat Measurements

The instrumentation and the orbit of the Viking satellite made this first Swedish satellite mission ideally suited for coordinated observations with the dense network of ground-based stations in northern Scandinavia. Several arrays of complementing instruments such as magnetometers, all-sky cameras, riometers and doppler radars monitored on a routine basis the ionosphere under the magnetospheric region passed by Viking . For a large number of orbits the Viking passages close to Scandinavia were covered by the operation of specially designed programmes at the European incoherent-scatter facility (EISCAT). First results of coordinated observations on the ground and aboard Viking have shed new light on the most spectacular feature of substorm expansion, the westward-travelling surge. The end of a substorm and the associated decay of a westward-travelling surge have been analysed, eiscat measurements of high spatial and temporal resolution indicate that the conductivities and electric fields associated with westward-travelling surges are not represented correctly by the existing models.

scholarly journals High-latitude poynting flux from combined Iridium and SuperDARN data

2004 ◽  
Vol 22 (8) ◽  
pp. 2861-2875 ◽  
Author(s):  
C. L. Waters ◽  
B. J. Anderson ◽  
R. A. Greenwald ◽  
R. J. Barnes ◽  
J. M. Ruohoniemi
Keyword(s):  
Electric Fields ◽  
Energy Flux ◽  
High Latitude ◽  
Electromagnetic Energy ◽  
Total Power ◽  
Data Sets ◽  
Poynting Flux ◽  
Magnetic Perturbations ◽  
Magnetometer Data ◽  
A New Technique

Abstract. Field-aligned currents convey stress between the magnetosphere and ionosphere, and the associated low altitude magnetic and electric fields reflect the flow of electromagnetic energy to the polar ionosphere. We introduce a new technique to measure the global distribution of high latitude Poynting flux, S||, by combining electric field estimates from the Super Dual Auroral Radar Network (SuperDARN) with magnetic perturbations derived using magnetometer data from the Iridium satellite constellation. Spherical harmonic methods are used to merge the data sets and calculate S|| for any magnetic local time (MLT) from the pole to 60° magnetic latitude (MLAT). The effective spatial resolutions are 2° MLAT, 2h MLT, and the time resolution is about one hour due to the telemetry rate of the Iridium magnetometer data. The technique allows for the assessment of high-latitude net S|| and its spatial distribution on one hour time scales with two key advantages: (1) it yields the net S|| including the contribution of neutral winds; and (2) the results are obtained without recourse to estimates of ionosphere conductivity. We present two examples, 23 November 1999, 14:00-15:00 UT, and 11 March 2000, 16:00-17:00 UT, to test the accuracy of the technique and to illustrate the distributions of S|| that it gives. Comparisons with in-situ S|| estimates from DMSP satellites show agreement to a few mW/m2 and in the locations of S|| enhancements to within the technique's resolution. The total electromagnetic energy flux was 50GW for these events. At auroral latitudes, S|| tends to maximize in the morning and afternoon in regions less than 5° in MLAT by two hours in MLT having S||=10 to 20mW/m2 and total power up to 10GW. The power poleward of the Region 1 currents is about one-third of the total power, indicating significant energy flux over the polar cap.

Modelling the ionospheric and plasmaspheric plasma

1989 ◽  
Vol 328 (1598) ◽  
pp. 255-270 ◽  
Keyword(s):  
Electric Fields ◽  
High Latitude ◽  
Thermal Plasma ◽  
Topside Ionosphere ◽  
Neutral Atmosphere ◽  
High Latitudes ◽  
Polar Wind ◽  
Low Latitude ◽  
Flux Tubes ◽  
Thermospheric Winds

Under magnetically quiet conditions, the outer plasmasphere is the equatorw ard boundary of the region in which high-latitude processes, such as convection, significantly affect the ionosphere. The low-latitude side of the ionospheric midlatitude trough is located in the plasmasphere. The behaviour of the nightside trough is influenced by field-aligned flows of plasma, as well as by convection drifts, thermospheric winds and particle precipitation. The modelling of field-aligned flow of thermal plasma at high latitudes (the polar wind) still presents problems. The composition of the background neutral atmosphere plays a role in causing the occasional dominance of He+ in the topside ionosphere. Penetration of magnetospheric electric fields into the outer plasmasphere can influence the rate of refilling of the upper reaches of the flux tubes.

High-latitude ionosphere structure in dayside sector on ground-based and satellite measurements

1997 ◽  
Vol 20 (3) ◽  
pp. 415-418 ◽  
Author(s):  
L.V Shestakova ◽  
A.E Stepanov ◽  
V.L Khalipov ◽  
A.P Mamrukov ◽  
L.D Filippov ◽  
...  
Keyword(s):  
High Latitude ◽  
Satellite Measurements ◽  
High Latitude Ionosphere

A new method to derive “instantaneous” high-latitude potential distributions from satellite measurements including auroral imager data

1987 ◽  
Vol 14 (4) ◽  
pp. 439-442 ◽  
Author(s):  
G. T. Marklund ◽  
L. G. Blomberg ◽  
T. A. Potemra ◽  
J. S. Murphree ◽  
F. J. Rich ◽  
...  
Keyword(s):  
High Latitude ◽  
New Method ◽  
Satellite Measurements ◽  
Auroral Imager

Effects of high-latitude conductivity on observed convection electric fields and Birkeland currents

1980 ◽  
Vol 85 (A12) ◽  
pp. 6811 ◽  
Author(s):  
M. Smiddy ◽  
W. J. Burke ◽  
M. C. Kelley ◽  
N. A. Saflekos ◽  
M. S. Gussenhoven ◽  
...  
Keyword(s):  
Electric Fields ◽  
High Latitude ◽  
Birkeland Currents
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