A case study of transient event motion in the magnetosphere and in the ionosphere

Korotova, G. I.; Sibeck, D. G.

doi:10.1029/94ja02296

Cited by 53 publications

(49 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These are observed, for instance, by satellites in the cold, dense magnetosheath and in the hot and tenuous magnetosphere plasmas, consistent with other related observations (Plaschke et al, 2009). It has also been found (Kivelson et al, 1984;Sibeck et al, 1989;Korotova and Sibeck, 1995) that magnetic pulsations with 8-10 min periods measured by geosynchronous satellites are well correlated with oscillations in the solar wind dynamic pressure.…”

Section: Introductionmentioning

confidence: 92%

Minute-scale period oscillations of the magnetosphere

et al. 2011

View full text Add to dashboard Cite

Abstract.Oscillations with periods on the order of 5-10 min have been observed by instrumented spacecrafts in the Earth's magnetosphere. These oscillations often follow sudden impacts related to coronal mass ejections. It is demonstrated that a simple model is capable of explaining these oscillations and give a scaling law for their basic characteristics in terms of the basic parameters of the problem. The period of the oscillations and their anharmonic nature, in particular, are accounted for. The model has no free adjustable numerical parameters. The results agree well with observations. The analysis is supported by numerical simulations solving the Magneto-Hydro-Dynamic (MHD) equations in two spatial dimensions, where we let a solar wind interact with a magnetic dipole representing a magnetized Earth. We consider two tilt-angles of the magnetic dipole axis. We find the formation of a magnetosheath with the magnetopause at a distance corresponding well to the analytical results. Sudden pulses in the model solar wind sets the model magnetosphere into damped oscillatory motions and quantitatively good agreement with the analytical results is achieved.

show abstract

Section: Introductionmentioning

confidence: 92%

Minute-scale period oscillations of the magnetosphere

et al. 2011

View full text Add to dashboard Cite

show abstract

“…The Sarafopoulos event lasted 2±3 h and had a frequency of 1.7 mHz, which is quite close to one of the CMS frequencies. The pulsation reported by Korotova and Sibeck (1995) had a frequency of 2.2 mHz, and those reported by Matsuoka et al (1995) also had a median frequency of 2.2 mHz.…”

Section: Pc 5 Wavesmentioning

confidence: 92%

“…2 (bottom). Korotova and Sibeck (1995) and Matsuoka et al (1995) use ground and geosynchronous (or near-geosynchronous) satellite observations along with a solar wind monitor and report Pc 5-band pulsations that are associated with similar periodic changes in the dynamic pressure of the solar wind. Matsuoka et al (1995) demonstrate that pulsations seen on the ground can be explained by a small change in the Chapman-Ferraro current on the magnetopause induced by solar wind pressure variations.…”

Section: Pc 5 Wavesmentioning

confidence: 99%

ULF waves: 1997 IAGA division 3 reporter review

Takahashi

1998

Ann Geophysicae

View full text Add to dashboard Cite

Abstract. Highlights of studies of ULF waves from 1995 to early 1997 are presented. The subjects covered include (1) Pc 3±5 waves excited by sources in the solar wind, with emphasis on the role of the magnetospheric cavity in modifying the external source and establishing its own resonances, and the role of the plasmapause in magnetohydrodynamic wave propagation; (2) Pi 2 waves, with emphasis on the plasmaspheric resonances and possible alternative excitation by plasmasheet source waves; (3) the spatial structure of internally excited long-period waves, including a kinetic theory for radially con®ned ring current instability and groundbased multipoint observation of giant pulsations; (4) amplitude-modulated Pc 1±2 waves in the outer magnetosphere (Pc 1±2 bursts) and in the inner magnetosphere (structured Pc 1 waves or pearls); and (5) the source region of the quasi-periodic emissions. Theory and observations are compared, and controversial issues are highlighted. In addition, some future directions are suggested.

show abstract

“…The Sarafopoulos event lasted 2-3 h and had a frequency of 1.7 mHz, which is quite close to one of the CMS frequencies. The pulsation reported by Korotova and Sibeck (1995) had a frequency of 2.2 mHz, and those reported by Matsuoka et al (1995) also had a median frequency of 2.2 mHz. From these examples it is clear that disturbances in the solar wind can be a direct cause of low-frequency pulsations observed on the ground and that wave guide modes are not necessarily the only cause of Pc5 pulsations.…”

Section: Introductionmentioning

confidence: 92%

“…Korotova and Sibeck (1995) and Matsuoka et al (1995) used ground and geosynchronous (or near-geosynchronous) satellite observations, along with a solar wind monitor and reported Pc5-band pulsations that are associated with similar periodic changes in the dynamic pressure of the solar wind. A similar but more persistent solar-wind-driven pulsation event in the tail lobe is reported by Sarafopoulos (1995), using IMP-8 observations.…”

Section: Introductionmentioning

confidence: 99%

A case study testing the cavity mode model of the magnetosphere

Sarafopoulos

2005

Ann. Geophys.

View full text Add to dashboard Cite

Abstract. Based on a case study we test the cavity mode model of the magnetosphere, looking for eigenfrequencies via multi-satellite and multi-instrument measurements. Geotail and ACE provide information on the interplanetary medium that dictates the input parameters of the system; the four Cluster satellites monitor the magnetopause surface waves; the POLAR (L=9.4) and LANL 97A (L=6.6) satellites reveal two in-situ monochromatic field line resonances (FLRs) with T=6 and 2.5 min, respectively; and the IMAGE ground magnetometers demonstrate latitude dependent delays in signature arrival times, as inferred by Sarafopoulos (2004b). Similar dispersive structures showing systematic delays are also extensively scrutinized by Sarafopoulos (2005) and interpreted as tightly associated with the socalled pseudo-FLRs, which show almost the same observational characteristics with an authentic FLR. In particular for this episode, successive solar wind pressure pulses produce recurring ionosphere twin vortex Hall currents which are identified on the ground as pseudo-FLRs. The BJN ground magnetometer records the pseudo-FLR (alike with the other IMAGE station responses) associated with an intense power spectral density ranging from 8 to 12 min and, in addition, two discrete resonant lines with T=3.5 and 7 min. In this case study, even though the magnetosphere is evidently affected by a broad-band compressional wave originated upstream of the bow shock, nevertheless, we do not identify any cavity mode oscillation within the magnetosphere. We fail, also, to identify any of the cavity mode frequencies proposed by .

show abstract

A case study of transient event motion in the magnetosphere and in the ionosphere

Cited by 53 publications

References 44 publications

Minute-scale period oscillations of the magnetosphere

Minute-scale period oscillations of the magnetosphere

ULF waves: 1997 IAGA division 3 reporter review

A case study testing the cavity mode model of the magnetosphere

Contact Info

Product

Resources

About