scholarly journals Plasma blobs observed by ground-based optical and radio techniques in the Brazilian tropical sector

2004 ◽  
Vol 31 (12) ◽  
pp. n/a-n/a ◽  
Author(s):  
A. A. Pimenta ◽  
Y. Sahai ◽  
J. A. Bittencourt ◽  
M. A. Abdu ◽  
H. Takahashi ◽  
...  
Keyword(s):  
Plasma Blobs

scholarly journals Filament simulations in regions of highly-varying parallel connection length

2020 ◽  
Vol 86 (3) ◽  
Author(s):  
B. Shanahan ◽  
P. Huslage
Keyword(s):  
Electric Field ◽  
Radial Velocity ◽  
Extreme Case ◽  
Radial Electric Field ◽  
Parallel Connection ◽  
Narrow Region ◽  
Propagation Regime ◽  
Connection Length ◽  
Plasma Blobs

The island divertor topology of the Wendelstein 7-X (W7-X) scrape-off-layer exhibits regions of highly varying connection length. Here, we present drift-plane simulations of seeded filaments in regions of sharp transitions in parallel connection length – a parameter which dictates the propagation regime for plasma blobs. It is determined that a transition in parallel connection length alters the trajectory of filaments; filaments which enter regions of lower connection length are decelerated, and vice versa. It is also determined that if the lobes of a potential dipole created by diamagnetic drifts within the filament exist in two regions of distinct parallel connection length, the filament is then steered towards the region of higher connection length. The extreme case of a narrow region of varying connection length can also alter the trajectory of a filament, depending on the extent of this region. Finally, simulations mimicking the view from the W7-X gas puff imaging (GPI) diagnostic view plane are presented. It is determined that filaments in the view of the W7-X GPI diagnostic exhibit a predominantly poloidal propagation due to the radial electric field, since the radial velocity is relatively small.

Modeling of large amplitude plasma blobs in three-dimensions

2014 ◽  
Vol 21 (1) ◽  
pp. 012514 ◽  
Author(s):  
Justin R. Angus ◽  
Maxim V. Umansky
Keyword(s):  
Large Amplitude ◽  
Three Dimensions ◽  
Plasma Blobs

scholarly journals INVESTIGATING THE DYNAMICS AND DENSITY EVOLUTION OF RETURNING PLASMA BLOBS FROM THE 2011 JUNE 7 ERUPTION

2014 ◽  
Vol 782 (2) ◽  
pp. 87 ◽  
Author(s):  
Jack Carlyle ◽  
David R. Williams ◽  
Lidia van Driel-Gesztelyi ◽  
Davina Innes ◽  
Andrew Hillier ◽  
...  
Keyword(s):  
Density Evolution ◽  
Plasma Blobs

scholarly journals Radial convection of finite ion temperature, high amplitude plasma blobs

2014 ◽  
Vol 21 (9) ◽  
pp. 092301 ◽  
Author(s):  
M. Wiesenberger ◽  
J. Madsen ◽  
A. Kendl
Keyword(s):  
High Amplitude ◽  
Ion Temperature ◽  
Radial Convection ◽  
Plasma Blobs

scholarly journals Dynamics of Plasma Blobs in a Shear Flow

2008 ◽  
Vol 101 (11) ◽  
Author(s):  
A. Diallo ◽  
A. Fasoli ◽  
I. Furno ◽  
B. Labit ◽  
M. Podestà ◽  
...  
Keyword(s):  
Shear Flow ◽  
Plasma Blobs

scholarly journals Cross-Field Motion of Plasma Blobs in an Open Magnetic Field Line Configuration

2009 ◽  
Vol 103 (6) ◽  
Author(s):  
C. Theiler ◽  
I. Furno ◽  
P. Ricci ◽  
A. Fasoli ◽  
B. Labit ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Field Line ◽  
Magnetic Field Line ◽  
Line Configuration ◽  
Open Magnetic Field ◽  
Plasma Blobs

scholarly journals Cluster observes formation of high-beta plasma blobs

2004 ◽  
Vol 22 (7) ◽  
pp. 2391-2401 ◽  
Author(s):  
G. Haerendel ◽  
E. Georgescu ◽  
K. H. Glassmeier ◽  
B. Klecker ◽  
Y. V. Bogdanova ◽  
...  
Keyword(s):  
Elevation Angle ◽  
Early Morning ◽  
Recovery Phase ◽  
Plasma Transport ◽  
Strong Correlations ◽  
Late Night ◽  
Plasma Blob ◽  
High Beta ◽  
Remaining Time ◽  
Plasma Blobs

Abstract. Late in a sequence of four moderate substorms on 26 July 2001, Cluster observed periods of a few minutes durations of high-beta plasma events (B<10nT, β=2-30), connected with dipolarizations of the magnetic field. Cluster was located near 02:45 MLT, at R=19RE and at about 5°N GSM. These events began late in the recovery phase of the second and about 5min before onset of the third substorm and lasted for three hours, way beyond the recovery phase of the fourth substorm. The most remarkable observation is that the onset coincided with the arrival of energetic (E~7keV) O+ ions and energetic electrons obviously from the ionosphere, which tended to dominate the plasma composition throughout the remaining time. The magnetic flux and plasma transport is continuously directed equatorward and earthward, with oscillatory east-west movements superposed. Periods of the order of 5-10min and strong correlations between the magnetic elevation angle and log β (correlation coefficient 0.78) are highly reminiscent of the high-beta plasma blobs discovered with Equator-S and Geotail between 9 and 11RE in the late night/early morning sector (Haerendel et al., 1999). We conclude that Cluster observed the plasma blob formation in the tail plasma sheet, which seems to occur predominantly in the recovery and post-recovery phases of substorms. This is consistent with the finding of Equator-S and Geotail. The origin is a pulsed earthward plasma transport with velocity amplitudes of only several tens of km/s.

Exact conservative solutions of fluid models for the scrape-off layer as the ancestors of plasma blobs?

2019 ◽  
Vol 60 (1) ◽  
pp. 016012
Author(s):  
João P.S. Bizarro ◽  
Luís Venâncio ◽  
R. Vilela Mendes
Keyword(s):  
Fluid Models ◽  
Plasma Blobs
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