Global view of dayside magnetic reconnection with the dusk-dawn IMF orientation: A statistical study for Double Star and Cluster data

2007 ◽  
Vol 34 (20) ◽  
Author(s):  
Z. Y. Pu ◽  
X. G. Zhang ◽  
X. G. Wang ◽  
J. Wang ◽  
X.-Z. Zhou ◽  
...  
Keyword(s):  
Magnetic Reconnection ◽  
Statistical Study ◽  
Double Star ◽  
Global View ◽  
Cluster Data

scholarly journals A statistical study of fast magnetic reconnection in turbulent accretion disks and jets

2019 ◽  
Author(s):  
Luis H.S. Kadowaki ◽  
Elisabete De Gouveia Dal Pino ◽  
Tania E. Medina-Torrejon
Keyword(s):  
Magnetic Reconnection ◽  
Accretion Disks ◽  
Statistical Study

scholarly journals A statistical study of the cross-shock electric potential at low Mach number, quasi-perpendicular bow shock crossings using Cluster data

2012 ◽  
Vol 117 (A2) ◽  
pp. n/a-n/a ◽  
Author(s):  
A. P. Dimmock ◽  
M. A. Balikhin ◽  
V. V. Krasnoselskikh ◽  
S. N. Walker ◽  
S. D. Bale ◽  
...  
Keyword(s):  
Mach Number ◽  
Electric Potential ◽  
Statistical Study ◽  
Bow Shock ◽  
Low Mach Number ◽  
Cluster Data ◽  
The Cross

scholarly journals Double Star, Cluster, and ground-based observations of magnetic reconnection during an interval of duskward oriented IMF: preliminary results

2005 ◽  
Vol 23 (8) ◽  
pp. 2903-2907 ◽  
Author(s):  
J. A. Wild ◽  
S. E. Milan ◽  
J. A. Davies ◽  
S. W. H. Cowley ◽  
C. M. Carr ◽  
...  
Keyword(s):  
Magnetic Reconnection ◽  
Northern Hemisphere ◽  
High Latitude ◽  
Double Star ◽  
Flux Tubes ◽  
Flux Transfer Events ◽  
Subsolar Point ◽  
Magnetic Flux Tubes ◽  
In Situ Observations

Abstract. We present a space- and ground-based study exploiting data from the coordinated Cluster and Double Star missions in order to investigate dayside magnetic reconnection under BY+ dominated IMF conditions. In-situ observations of magnetosheath flux transfer events combined with measurements of pulsed poleward and dawnward directed flows in the pre-noon sector high-latitude northern hemisphere ionosphere are interpreted as indications of pulsed magnetic reconnection during an interval in which the IMF remained relatively steady. Observations of newly-reconnected magnetic flux tubes anchored in the northern hemisphere both at mid-latitudes and in the vicinity of the subsolar point suggests that during BY+ dominated IMF, reconnection is not, as proposed previously, limited to the high-latitude magnetopause.

scholarly journals Magnetopause reconnection across wide local time

2011 ◽  
Vol 29 (9) ◽  
pp. 1683-1697 ◽  
Author(s):  
M. W. Dunlop ◽  
Q.-H. Zhang ◽  
Y. V. Bogdanova ◽  
K. J. Trattner ◽  
Z. Pu ◽  
...  
Keyword(s):  
Magnetic Reconnection ◽  
Large Scale ◽  
Double Star ◽  
Local Times ◽  
Low Latitude ◽  
Guide Field ◽  
Dayside Magnetopause ◽  
Wide Range ◽  
Low Latitudes ◽  
Local Noon

Abstract. During April to July 2007 a combination of 10 spacecraft provided simultaneous monitoring of the dayside magnetopause across a wide range of local times. The array of four Cluster spacecraft, separated at large distances (10 000 km), were traversing the dawn-side magnetopause at high and low latitudes; the five THEMIS spacecraft were often in a 4 + 1 grouped configuration, traversing the low latitude, dusk-side magnetosphere, and the Double star, TC-1 spacecraft was in an equatorial orbit between the local times of the THEMIS and Cluster orbits. We show here a number of near simultaneous conjunctions of all 10 spacecraft at the magnetopause. One conjunction identifies an extended magnetic reconnection X-line, tilted in the low latitude, sub-solar region, which exists together with active anti-parallel reconnection sites extending to locations on the dawn-side flank. Oppositely moving FTE's are observed on all spacecraft, consistent with the initially strong IMF By conditions and the comparative locations of the spacecraft both dusk-ward and dawn-ward of noon. Comparison with other conjunctions of magnetopause crossings, which are also distributed over wide local times, supports the result that reconnection activity may occur at many sites simultaneously across the sub-solar and flank magnetopause, but linked to the large scale (extended) configuration of the merging line; broadly depending on IMF orientation. The occurrence of MR therefore inherently follows a "component" driven scenario irrespective of the guide field conditions. Some conjunctions allow the global magnetopause response to IMF changes to be observed and the distribution of spacecraft can directly confirm its shape, motion and deformation at local noon, dawn and dusk-side, simultaneously.

scholarly journals A statistical study of hot flow anomalies using Cluster data

2008 ◽  
Vol 41 (8) ◽  
pp. 1286-1291 ◽  
Author(s):  
G. Facskó ◽  
K. Kecskeméty ◽  
G. Erdős ◽  
M. Tátrallyay ◽  
P.W. Daly ◽  
...  
Keyword(s):  
Statistical Study ◽  
Cluster Data

scholarly journals Statistical study of magnetic cloud erosion by magnetic reconnection

2015 ◽  
Vol 120 (1) ◽  
pp. 43-60 ◽  
Author(s):  
A. Ruffenach ◽  
B. Lavraud ◽  
C. J. Farrugia ◽  
P. Démoulin ◽  
S. Dasso ◽  
...  
Keyword(s):  
Magnetic Reconnection ◽  
Statistical Study ◽  
Magnetic Cloud

scholarly journals Recent highlights from Cluster, the first 3-D magnetospheric mission

2015 ◽  
Vol 33 (10) ◽  
pp. 1221-1235 ◽  
Author(s):  
C. P. Escoubet ◽  
A. Masson ◽  
H. Laakso ◽  
M. L. Goldstein
Keyword(s):  
Solar Wind ◽  
High Resolution ◽  
Magnetic Reconnection ◽  
High Temporal Resolution ◽  
Science Data ◽  
High Resolution Data ◽  
Cluster Data ◽  
Time Period ◽  
Wide Range ◽  
First Time

Abstract. The Cluster mission has been operated successfully for 14 years. During this time period, the evolution of the orbit has enabled Cluster to sample many more magnetospheric regions than was initially anticipated. So far, the separation of the Cluster spacecraft has been changed more than 30 times and has ranged from a few kilometres up to 36 000 km. These orbital changes have enabled the science team to address a wide variety of scientific objectives in key regions of Earth's geospace environment: the solar wind and bow shock, the magnetopause, polar cusps, magnetotail, plasmasphere and the auroral acceleration region. Recent results have shed new light on solar wind turbulence. They showed that the magnetosheath can be asymmetric under low Mach number and that it can contain density enhancement that may affect the magnetosphere. The magnetopause was found to be thinner and to have a higher current density on the duskside than on the dawnside. New methods have been used to obtain characteristic of the magnetotail current sheet and high-temporal-resolution measurements of electron pitch angle within flux transfer events (FTEs). Plasmaspheric wind has been discovered, and the refilling of the plasmasphere was observed for the first time over a very wide range of L shells. New models of global electric and magnetic fields of the magnetosphere have been obtained where Cluster, due to its polar orbit, has been essential. Finally, magnetic reconnection was viewed for the first time with high-resolution wave and electron measurements and acceleration of plasma was observed during times of varying rate of magnetic reconnection. The analysis of Cluster data was facilitated by the creation of the Cluster Science Data System (CSDS) and the Cluster Science Archive (CSA). Those systems were implemented to provide, for the first time for a plasma physics mission, a long-term public archive of all calibrated high-resolution data from all instruments.

scholarly journals Statistical Study of Solar White-light Flares and Comparison with Superflares on Solar-type Stars

2018 ◽  
Vol 13 (S340) ◽  
pp. 221-224
Author(s):  
Kosuke Namekata ◽  
Takahito Sakaue ◽  
Kyoko Watanabe ◽  
Ayumi Asai ◽  
Hiroyuki Maehara ◽  
...  
Keyword(s):  
Magnetic Reconnection ◽  
White Light ◽  
Decay Time ◽  
Solar Flares ◽  
Statistical Study ◽  
Scaling Law ◽  
Statistical Research ◽  
Solar Type

AbstractRecently, many superflares on solar-type stars were discovered as white-light flares (WLFs). A correlation between the energies (E) and durations (t) of superflares is derived as t∝E0.39, and this can be theoretically explained by magnetic reconnection (t∝E1/3). In this study, we carried out a statistical research on 50 solar WLFs with SDO/HMI to examine the t-E relation. As a result, the t-E relation on solar WLFs (t∝E0.38) is quite similar stellar superflares, but the durations of stellar superflares are much shorter than those extrapolated from solar WLFs. We present the following two interpretations; (1) in solar flares, the cooling timescale of WL emission may be longer than the reconnection one, and the decay time can be determined by the cooling timescale; (2) the distribution can be understood by applying a scaling law t∝E1/3B−5/3 derived from the magnetic reconnection theory.

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