Transport of energetic solar particles on closed magnetospheric field lines

1975 ◽  
Vol 17 (1) ◽  
pp. 3-44 ◽  
Author(s):  
Manfred Scholer
Keyword(s):  
Solar Particles ◽  
Field Lines ◽  
Magnetospheric Field

Solar particles and the dayside limit of closed field lines

1972 ◽  
Vol 77 (7) ◽  
pp. 1103-1108 ◽  
Author(s):  
I. B. McDiarmid ◽  
J. R. Burrows ◽  
Margaret D. Wilson
Keyword(s):  
Closed Field ◽  
Solar Particles ◽  
Field Lines

scholarly journals The Variation of Resonating Magnetospheric Field Lines With Changing Geomagnetic and Solar Wind Conditions

2019 ◽  
Vol 124 (7) ◽  
pp. 5353-5375 ◽  
Author(s):  
S. J. Wharton ◽  
D. M. Wright ◽  
T. K. Yeoman ◽  
M. K. James ◽  
J. K. Sandhu
Keyword(s):  
Solar Wind ◽  
Field Lines ◽  
Magnetospheric Field

scholarly journals Simultaneous Double Star and Cluster FTEs observations on the dawnside flank of the magnetosphere

2005 ◽  
Vol 23 (8) ◽  
pp. 2877-2887 ◽  
Author(s):  
A. Marchaudon ◽  
C. J. Owen ◽  
J.-M. Bosqued ◽  
R. C. Fear ◽  
A. N. Fazakerley ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Southern Hemisphere ◽  
Double Star ◽  
Simultaneous Observation ◽  
Flux Transfer Events ◽  
Reconnection Site ◽  
Field Lines ◽  
Almost All ◽  
Magnetospheric Field ◽  
Imf Clock Angle

Abstract. We present Cluster and Double Star-1 (TC-1) observations from a close magnetic conjunction on 8 May 2004. The five spacecraft were on the dawnside flank of the magnetosphere, with TC-1 located near the equatorial plane and Cluster at higher geographic latitudes in the Southern Hemisphere. TC-1, at its apogee, skimmed the magnetopause for almost 8h (between 08:00-16:00 UT). Flux Transfer Events (FTEs), moving southward/tailward from the reconnection site, were observed by TC-1 throughout almost all of the period. Cluster, travelling on a mainly dawn-dusk trajectory, crossed the magnetopause at around 10:30 UT in the same Magnetic Local Time (MLT) sector as TC-1 and remained close to the magnetopause boundary layer in the Southern Hemisphere. The four Cluster spacecraft observed FTEs for a period of 6.5h between 07:30 and 14:00 UT. The very clear signatures and the finite transverse sizes of the FTEs observed by TC-1 and Cluster imply that, during this event, sporadic reconnection occurred. From the properties of these FTEs, the reconnection site was located northward of both TC-1 and Cluster on the dawn flank of the magnetosphere. Reconnection occurred between draped magnetosheath and closed magnetospheric field lines. Despite variable interplanetary magnetic field (IMF) conditions and IMF-Bz turnings, the IMF clock angle remained greater than 70° and the location site appeared to remain relatively stable in position during the whole period. This result is in agreement with previous studies which reported that the dayside reconnection remained active for an IMF clock angle greater than 70°. The simultaneous observation of FTEs at both Cluster and TC-1, separated by 2h in MLT, implies that the reconnection site on the magnetopause must have been extended over several hours in MLT.

scholarly journals Distribution of density along magnetospheric field lines

2006 ◽  
Vol 111 (A4) ◽  
Author(s):  
R. E. Denton ◽  
K. Takahashi ◽  
I. A. Galkin ◽  
P. A. Nsumei ◽  
X. Huang ◽  
...  
Keyword(s):  
Field Lines ◽  
Magnetospheric Field

scholarly journals Secondary Magnetic Reconnection at Earth’s Flank Magnetopause

2021 ◽  
Vol 8 ◽  
Author(s):  
B. B. Tang ◽  
W. Y. Li ◽  
C. Wang ◽  
Yu. V. Khotyaintsev ◽  
D. B. Graham ◽  
...  
Keyword(s):  
Solar Wind ◽  
Magnetic Reconnection ◽  
Open Field ◽  
Global Scale ◽  
Diffusion Region ◽  
Magnetic Shear ◽  
Magnetospheric Multiscale ◽  
Field Lines ◽  
Secondary Ion ◽  
Magnetospheric Field

We report local secondary magnetic reconnection at Earth’s flank magnetopause by using the Magnetospheric Multiscale observations. This reconnection is found at the magnetopause boundary with a large magnetic shear between closed magnetospheric field lines and the open field lines generated by the primary magnetopause reconnection at large scales. Evidence of this secondary reconnection are presented, which include a secondary ion jet and the encounter of the electron diffusion region. Thus the observed secondary reconnection indicates a cross-scale process from a global scale to an electron scale. As the aurora brightening is also observed at the morning ionosphere, the present secondary reconnection suggests a new pathway for the entry of the solar wind into geospace, providing an important modification to the classic Dungey cycle.

scholarly journals Four point measurements of electrons using PEACE in the high-altitude cusp

2001 ◽  
Vol 19 (10/12) ◽  
pp. 1567-1578 ◽  
Author(s):  
M. G. G. T. Taylor ◽  
A. Fazakerley ◽  
I. C. Krauklis ◽  
C. J. Owen ◽  
P. Travnicek ◽  
...  
Keyword(s):  
Boundary Layer ◽  
High Altitude ◽  
Boundary Region ◽  
Small Scale ◽  
Measurement Capability ◽  
First Case ◽  
Motion Study ◽  
Field Lines ◽  
Magnetospheric Boundaries ◽  
Magnetospheric Field

Abstract. We present examples of electron measurements from the PEACE instruments on the Cluster spacecraft in the high-latitude, high-altitude region of the Earth’s magnetosphere. Using electron density and energy spectra measurements, we examine two cases where the orbit of the Cluster tetrahedron is outbound over the northern hemisphere, in the afternoon sector approaching the magnetopause. Data from the magnetometer is also used to pinpoint the position of the spacecraft with respect to magnetospheric boundaries. This preliminary work specifically highlights the benefit of the multipoint measurement capability of the Cluster mission. In the first case, we observe a small-scale spatial structure within the magnetopause boundary layer. The Cluster spacecraft initially straddle a boundary, characterised by a discontinuous change in the plasma population, with a pair of spacecraft on either side. This is followed by a complete crossing of the boundary by all four spacecraft. In the second case, Cluster encounters an isolated region of higher energy electrons within the cusp. The characteristics of this region are consistent with a trapped boundary layer plasma sheet population on closed magnetospheric field lines. However, a boundary motion study indicates that this region convects past Cluster, a characteristic more consistent with open field lines. An interpretation of this event in terms of the motion of the cusp boundary region is presented.Key words. Magnetospheric physics (magnetopause, cusp and boundary layers; solar wind-magnetosphere interactions)

scholarly journals A new, unique signature of the true cusp

2001 ◽  
Vol 19 (6) ◽  
pp. 611-619 ◽  
Author(s):  
W. R. Keith ◽  
J. D. Winningham ◽  
O. Norberg
Keyword(s):  
Weak Field ◽  
Particle Field ◽  
Continuous Contact ◽  
Scale Size ◽  
And Topology ◽  
Magnetospheric Configuration And Dynamics ◽  
Field Lines ◽  
Magnetospheric Field ◽  
Insight Into ◽  
Unique Signature

Abstract. The "cusp proper" is generally understood to be the region enclosed by the outermost magnetospheric field lines as they map to low altitudes. It is therefore a weak-field region with continuous contact with magnetosheath plasma. Data from the recent Astrid-2 Swedish microsatellite are presented which show a new, unique signature (dubbed the "true cusp") during cusp crossings that can now be shown to be consistently present and with which one can redefine the physical meaning and topology of the cusp. Similar crossings made by the DE-2, UARS and DMSP-F10 satellites also show this same, unique signature although in most cases the spatial resolution was much less than that of the Astrid-2 MEDUSA spectrometer. The presence of concurrent features of the same scale size as the plasma in the energetic particle, field and wave power data shows that this is a real structural feature and not a coincidental structure among plasma instruments. The persistence of this feature may lend new insight into the dynamics of the cusp and magnetospheric particle entry.Key words. Magnetospheric physics (magnetopause, cusp, arid boundary layers; magnetospheric configuration and dynamics)

Collective Ion Acceleration by Relativistic Electron Rings in the Magnetosphere

1982 ◽  
Vol 37 (8) ◽  
pp. 946-953
Author(s):  
U. Schumacher ◽  
R. W. Boswell
Keyword(s):  
Magnetic Field ◽  
Initial Energy ◽  
Local Magnetic Field ◽  
Relativistic Electrons ◽  
Polar Regions ◽  
Drift Motion ◽  
Field Lines ◽  
Constant Altitude ◽  
The Magnetic Field ◽  
Magnetospheric Field

Calculations are presented which show that the collective acceleration of ions by rings of relativistic electrons seems feasible in the polar regions of a dipolar magnetospheric field. The well known magnetic field of the earth is taken as an example and it is found that with rings of electrons of only 4 MeV initial energy, deuterons can be accelerated up to energies of about 50 MeV from rest in a distance of one third of an earth radius. Although the drift motion of the electron rings across the magnetic field lines is negligible for latitudes greater than 45°, in the equatorial plane the ring drifts at constant altitude with a speed proportional to the local magnetic field index

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