scholarly journals First detection of the supersonic upward plasma flow structures in the early morning sector

2015 ◽  
Vol 42 (22) ◽  
pp. 9642-9649
Author(s):  
Elvira Astafyeva ◽  
Irina Zakharenkova
Keyword(s):  
Plasma Flow ◽  
Early Morning ◽  
Flow Structures ◽  
Morning Sector

Aurora and Electrojet Configuration in the Early Morning Sector

1984 ◽  
Vol 89 (A1) ◽  
pp. 389-393 ◽  
Author(s):  
Y. Kamide ◽  
R. M. Robinson ◽  
S. -I. Akasofu ◽  
T. A. Potemra
Keyword(s):  
Early Morning ◽  
Morning Sector

scholarly journals Comparison of the magnetic equivalent convection direction and ionospheric convection observed by the SuperDARN radars

2006 ◽  
Vol 24 (11) ◽  
pp. 2981-2990 ◽  
Author(s):  
L. V. Benkevitch ◽  
A. V. Koustov ◽  
J. Liang ◽  
J. F. Watermann
Keyword(s):  
Local Time ◽  
High Latitude ◽  
Early Morning ◽  
Auroral Oval ◽  
Magnetic Local Time ◽  
Ionospheric Convection ◽  
Morning Sector ◽  
Magnetometer Data ◽  
Different Seasons

Abstract. SuperDARN radar and high-latitude magnetometer observations are used to statistically investigate quality of the convection direction estimates from magnetometer data if assumption is made that the magnetic equivalent convection vector (MEC) corresponds to the convection direction. The statistics includes five full days, ~75 000 of joint individual measurements for different seasons. It is demonstrated that the best (worst) agreement between the MEC and ionospheric convection occurs for the sunlit, summer (dark, winter) ionosphere. Overall, the MEC direction is reasonable (deviates less than 45° from the SuperDARN direction) in at least ~55% of points and it is better for the latitudes of the auroral oval. In terms of the magnetic local time, the agreement is the best (worst) in the dusk (early morning) sector. Possible reasons for differences between the MEC and ionospheric convection directions are discussed.

scholarly journals Substorm observations in the early morning sector with Equator-S and Geotail

1999 ◽  
Vol 17 (12) ◽  
pp. 1602-1610 ◽  
Author(s):  
R. Nakamura ◽  
G. Haerendel ◽  
W. Baumjohann ◽  
A. Vaivads ◽  
H. Kucharek ◽  
...  
Keyword(s):  
Plasma Sheet ◽  
High Speed ◽  
Radial Distance ◽  
Early Morning ◽  
Field Configuration ◽  
Morning Sector ◽  
Magnetospheric Configuration And Dynamics ◽  
Abstract Data ◽  
Shear Structure ◽  
Poleward Expansion

Abstract. Data from Equator-S and Geotail are used to study the dynamics of the plasma sheet observed during a substorm with multiple intensifications on 25 April 1998, when both spacecraft were located in the early morning sector (03–04 MLT) at a radial distance of 10–11 RE. In association with the onset of a poleward expansion of the aurora and the westward electrojet in the premidnight and midnight sector, both satellites in the morning sector observed plasma sheet thinning and changes toward a more tail-like field configuration. During the subsequent poleward expansion in a wider local time sector (20–04 MLT), on the other hand, the magnetic field configuration at both satellites changed into a more dipolar configuration and both satellites encountered again the hot plasma sheet. High-speed plasma flows with velocities of up to 600 km/s and lasting 2–5 min were observed in the plasma sheet and near its boundary during this plasma sheet expansion. These high-speed flows included significant dawn-dusk flows and had a shear structure. They may have been produced by an induced electric field at the local dipolarization region and/or by an enhanced pressure gradient associated with the injection in the midnight plasma sheet.Key words. Magnetospheric physics (magnetospheric configuration and dynamics; plasma sheet; storms and substorms)

A topological analysis of plasma flow structures

2013 ◽  
Vol 46 (37) ◽  
pp. 375501 ◽  
Author(s):  
Benjamin A Carreras ◽  
Irene Llerena Rodríguez ◽  
Luis García
Keyword(s):  
Plasma Flow ◽  
Topological Analysis ◽  
Flow Structures

scholarly journals Relation of plasma flow structures to passive particle tracer orbits

2017 ◽  
Vol 57 (11) ◽  
pp. 116013 ◽  
Author(s):  
L. García ◽  
B.A. Carreras ◽  
I. Llerena
Keyword(s):  
Plasma Flow ◽  
Flow Structures ◽  
Particle Tracer

scholarly journals The association between giant pulsations (Pgs) and the auroral oval

1994 ◽  
Vol 12 (7) ◽  
pp. 649-654 ◽  
Author(s):  
G. Chisham ◽  
D. Orr
Keyword(s):  
Plasma Sheet ◽  
Geomagnetic Latitude ◽  
Early Morning ◽  
Auroral Oval ◽  
Resonant Field ◽  
Morning Sector ◽  
Field Lines ◽  
Giant Pulsations ◽  
Latitudinal Band

Abstract. Two features of giant pulsations (Pgs) which still require an explanation are firstly, why Pgs occur mainly in the early morning sector (i.e. 03:00-07:00 MLT) and not at other times of day, and secondly, why Pgs occur preferentially in a narrow latitudinal band (approximately 63°-68° geomagnetic latitude). Using statistics from 34 Pg events observed by the EISCAT magnetometer cross, a comparison has been made between the location of the Pg resonant field lines and the equatorward edge of the auroral oval. The majority of these Pg events appear to occur just poleward of this boundary. Using these results, an explanation of the two features of Pgs as detailed above is made. This explanation involves the interaction of protons, which may be responsible for the Pg events, with the inner edge of the plasma sheet or with its ionospheric equivalent, the equatorward edge of the auroral oval.

Width and rugosity of the topological plasma flow structures and their relation to the radial flights of particle tracers

2015 ◽  
Vol 55 (11) ◽  
pp. 113023 ◽  
Author(s):  
L. García ◽  
I. Llerena Rodríguez ◽  
B.A. Carreras
Keyword(s):  
Plasma Flow ◽  
Flow Structures
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