Asymmetric ionospheric outflow observed at the dayside magnetopause

2015 ◽  
Vol 120 (5) ◽  
pp. 3564-3573 ◽  
Author(s):  
S. H. Lee ◽  
H. Zhang ◽  
Q.-G. Zong ◽  
Y. Wang ◽  
A. Otto ◽  
...  
Keyword(s):  
Dayside Magnetopause ◽  
Ionospheric Outflow

The Effect of Solar Wind Mach Numbers on the Occurrence Rate of Flux Transfer Events at the Dayside Magnetopause

2019 ◽  
Vol 46 (8) ◽  
pp. 4106-4113 ◽  
Author(s):  
C. Chen ◽  
T. R. Sun ◽  
C. Wang ◽  
Z. H. Huang ◽  
B. B. Tang ◽  
...  
Keyword(s):  
Solar Wind ◽  
Occurrence Rate ◽  
Flux Transfer Events ◽  
Dayside Magnetopause ◽  
Mach Numbers ◽  
Flux Transfer

scholarly journals Interplanetary magnetic field control of Saturn's polar cusp aurora

2005 ◽  
Vol 23 (4) ◽  
pp. 1405-1431 ◽  
Author(s):  
E. J. Bunce ◽  
S. W. H. Cowley ◽  
S. E. Milan
Keyword(s):  
Magnetic Field ◽  
Solar Wind ◽  
Interplanetary Magnetic Field ◽  
Field Line ◽  
High Latitude ◽  
Closed Field ◽  
Vortical Flows ◽  
Dayside Magnetopause ◽  
Closed Field Line ◽  
Lobe Reconnection

Abstract. Dayside UV emissions in Saturn's polar ionosphere have been suggested to be the first observational evidence of the kronian "cusp" (Gérard et al., 2004). The emission has two distinct states. The first is a bright arc-like feature located in the pre-noon sector, and the second is a more diffuse "spot" of aurora which lies poleward of the general location of the main auroral oval, which may be related to different upstream interplanetary magnetic field (IMF) orientations. Here we take up the suggestion that these emissions correspond to the cusp. However, direct precipitation of electrons in the cusp regions is not capable of producing significant UV aurora. We have therefore investigated the possibility that the observed UV emissions are associated with reconnection occurring at the dayside magnetopause, possibly pulsed, akin to flux transfer events seen at the Earth. We devise a conceptual model of pulsed reconnection at the low-latitude dayside magnetopause for the case of northwards IMF which will give rise to pulsed twin-vortical flows in the magnetosphere and ionosphere in the vicinity of the open-closed field-line boundary, and hence to bi-polar field-aligned currents centred in the vortical flows. During intervals of high-latitude lobe reconnection for southward IMF, we also expect to have pulsed twin-vortical flows and corresponding bi-polar field-aligned currents. The vortical flows in this case, however, are displaced poleward of the open-closed field line boundary, and are reversed in sense, such that the field-aligned currents are also reversed. For both cases of northward and southward IMF we have also for the first time included the effects associated with the IMF By effect. We also include the modulation introduced by the structured nature of the solar wind and IMF at Saturn's orbit by developing "slow" and "fast" flow models corresponding to intermediate and high strength IMF respectively. We then consider the conditions under which the plasma populations appropriate to either sub-solar reconnection or high-latitude lobe reconnection can carry the currents indicated. We have estimated the field-aligned voltages required, the resulting precipitating particle energy fluxes, and the consequent auroral output. Overall our model of pulsed reconnection under conditions of northwards and southwards IMF, and for varying orientations of IMF By, is found to produce a range of UV emission intensities and geometries which is in good agreement with the data presented by Gérard et al. (2004). The recent HST-Cassini solar wind campaign provides a unique opportunity to test the theoretical ideas presented here.

Investigation into the spatial and temporal coherence of ionospheric outflow on January 9–12, 1997

2002 ◽  
Vol 64 (15) ◽  
pp. 1659-1666 ◽  
Author(s):  
W.K. Peterson ◽  
H.L. Collin ◽  
M. Boehm ◽  
A.W. Yau ◽  
C. Cully ◽  
...  
Keyword(s):  
Temporal Coherence ◽  
Ionospheric Outflow

scholarly journals Bifurcation of drift shells near the dayside magnetopause

2007 ◽  
Vol 112 (A7) ◽  
pp. n/a-n/a ◽  
Author(s):  
M. Kaan Öztürk ◽  
R. A. Wolf
Keyword(s):  
Dayside Magnetopause

A study of multiple X line reconnection at the dayside magnetopause

1988 ◽  
Vol 15 (4) ◽  
pp. 295-298 ◽  
Author(s):  
Y. Shi ◽  
C. C. Wu ◽  
L. C. Lee
Keyword(s):  
Dayside Magnetopause

scholarly journals Some comments on transient and steady-state reconnection at the dayside magnetopause

2000 ◽  
Vol 27 (9) ◽  
pp. 1359-1362 ◽  
Author(s):  
Alan S. Rodger ◽  
Iain J. Coleman ◽  
Mike Pinnock
Keyword(s):  
Steady State ◽  
Dayside Magnetopause ◽  
Transient And Steady State

A statistical study of accelerated flow events at the dayside magnetopause

1994 ◽  
Vol 99 (A8) ◽  
pp. 14815 ◽  
Author(s):  
L. Scurry ◽  
C. T. Russell ◽  
J. T. Gosling
Keyword(s):  
Statistical Study ◽  
Dayside Magnetopause ◽  
Accelerated Flow
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