On the solar wind flow control of the polar cusp

Lundin, R.; Aparicio, B.; Yamauchi, M.

doi:10.1029/2000ja900021

Cited by 21 publications

(14 citation statements)

References 29 publications

(18 reference statements)

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“…The wind sock effect due to the deviation of the solar wind velocity from the Sun‐Earth line has been indeed statistically observed by the Hawkeye mission [ Boardsen et al , 2000]. As suggested by Lundin et al [2001], the solar wind azimuthal flow component may probably be deflected by the large scale heliosphere current sheet/plasma sheet; see Figure 1. When the solar wind azimuthal flow changed from 7 degree to 2 degree, the cusp was shifted westward and Cluster entered the cusp again and repeated a couple of times [ Zong et al , 2004].…”

Section: Discussionmentioning

confidence: 72%

“…[4] The windsock effect due to the deviation of the solar wind velocity from the Sun-Earth line has been indeed observed by the Hawkeye mission [Boardsen et al, 2000]. Further, an explanation of the dawn-dusk displacement of the cusp which was strongly connected to the solar wind azimuthal flow component (which is probably deflected by the large scale heliosphere current sheet/plasma sheet) was suggested by Lundin et al [2001]. The solar wind component flow related displacement shows that there is a ''tugging'' motion of the cusp location whereby it moves in the direction of the flow.…”

Section: Introductionmentioning

confidence: 94%

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Multiple cusps during an extended northward IMF period with a significant B_y component

et al. 2008

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[1] On 21-22 March 2001, four cusp-like regions were observed consecutively in about five hours by all four Cluster spacecraft when the interplanetary magnetic field (IMF) was northward with a significant B y component. All four cusp-like encounters were characterized by turbulent magnetic fields, high-density plasma, and plasma flow significantly slower than the magnetosheath level. The cusp-like regions are associated with thermalized, bidirectional distributed plasma electrons. The first encountered cusp is the main cusp; the other three cusp-like regions are temporal effects. The normal velocities v n at boundary interfaces (exit from the cusp) are found to be almost three times larger than that at boundary interfaces (entry into the cusp). The boundary normal, velocity, and timing analysis for six clear boundaries of the last three cusps obtained by all four spacecraft indicates that they are most likely one boundary shifting in the dawn-dusk direction between the dayside magnetosphere/trapping region and the cusp region. So the Cluster spacecraft have been observing the same cusp, and it appeared as four cusp-like regions due to possible magnetospheric oscillations. Oscillations with a period of 22 min are observed by the Cluster spacecraft in the high-latitude region, which is in agreement with the cold-dense plasma sheet fluctuations (20 min period) observed by the Geotail satellite. Multiple cusps observed by Cluster and the wavy-like structures in the dusk low-latitude boundary layer observed by Geotail simultaneously suggest the whole magnetosphere is oscillating during northward IMF.Citation: Zong, Q. -G., et al. (2008), Multiple cusps during an extended northward IMF period with a significant B y component,

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Section: Discussionmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 94%

Multiple cusps during an extended northward IMF period with a significant B_y component

et al. 2008

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“…We found that the occurrence frequency of ion upflow is high for high SW density. Precipitating ion flux into the ionosphere is correlated with the SW density [ Lundin et al , 2001]. As a result, high SW dynamic pressure widens the cusp, whereas high magnetic pressure narrows it [ Yamauchi et al , 1996; Zhou et al , 2000].…”

Section: Discussionmentioning

confidence: 99%

Characteristics of ion upflow and downflow observed with the European Incoherent Scatter Svalbard radar

et al. 2009

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[1] We have investigated how geomagnetic activity, the solar wind (SW), and the interplanetary magnetic field (IMF) influence the occurrence of the F-region/topside ionospheric ion upflow and downflow. Occurrence of dayside ion upflow observed with the European Incoherent Scatter Svalbard radar (ESR) at 75.2°magnetic latitude is highly correlated with the SW density, as well as with the strength of the IMF By component. We suggest that this correlation exists because the region where ion upflow occurs is enlarged owing to SW density and IMF By magnitude, but it does not move significantly in geomagnetic latitude. The occurrence frequency of dayside ion upflow displays peaks versus the geomagnetic activity index (Kp), SW velocity, and negative IMF Bz component; that is, ion upflow is less frequently seen at the highest values of these parameters. Dayside ion downflow in the F-region/topside ionosphere occurs only when the Kp index and/or SW velocity are high or when IMF Bz is largely negative. The ion downflow is likely due to ballistic return of the ion upflow. We suggest that the region of ion upflow not only becomes larger but also moves equatorward with increasing Kp, SW velocity, and negative IMF Bz. The ESR can so be poleward of the upflow region and observe ions convecting poleward and returning ballistically downward.

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“…In a remarkable departure, Zong et al (2004) studied the motions of the dayside cusps and found a large response which they concluded was temporal, and which they attributed to just these velocity changes. Earlier work by Lundin et al (2001) had also highlighted the potential importance of these changes to the cusp.…”

Section: Introductionmentioning

confidence: 92%

Aspects of magnetopause/magnetosphere response to interplanetary discontinuities, and features of magnetopause Kelvin–Helmholtz waves

Farrugia

Gratton

2011

Journal of Atmospheric and Solar-Terrestrial Physics

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On the solar wind flow control of the polar cusp

Cited by 21 publications

References 29 publications

Multiple cusps during an extended northward IMF period with a significant B_y component

Multiple cusps during an extended northward IMF period with a significant B_y component

Characteristics of ion upflow and downflow observed with the European Incoherent Scatter Svalbard radar

Aspects of magnetopause/magnetosphere response to interplanetary discontinuities, and features of magnetopause Kelvin–Helmholtz waves

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On the solar wind flow control of the polar cusp

Cited by 21 publications

References 29 publications

Multiple cusps during an extended northward IMF period with a significant By component

Multiple cusps during an extended northward IMF period with a significant By component

Characteristics of ion upflow and downflow observed with the European Incoherent Scatter Svalbard radar

Aspects of magnetopause/magnetosphere response to interplanetary discontinuities, and features of magnetopause Kelvin–Helmholtz waves

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Multiple cusps during an extended northward IMF period with a significant B_y component

Multiple cusps during an extended northward IMF period with a significant B_y component