Excitation of magnetospheric waveguide modes by magnetosheath flows

Mann, I. R.; Wright, Andrew N.; Mills, Katharine J.; Nakariakov, V. M.

doi:10.1029/1998ja900026

Cited by 203 publications

(259 citation statements)

References 53 publications

(50 reference statements)

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“…It was observed that, at auroral latitudes, low-frequency pulsations show a clear morning/afternoon asymmetry, with an higher occurrence rate in the morning (Rostoker and Sullivan, 1987;Ziesolleck and McDiarmid, 1995;Chisham and Orr, 1997;Mathie et al, 1999) and that afternoon pulsations are driven dominantly by sporadic impulses in the SW (Rostoker and Sullivan, 1987). Consistent with the theory by Mann et al (1999), who investigated the energization of waveguide modes by magnetosheath flows on the magnetopause flanks, and with the observations by Mathie et al (1999) and Matthie and Mann (2000), the observed morning/afternoon asymmetry can be explained in terms of a greater stability of the postnoon magnetopause to shear-flow instabilities than the dawn flank; in this sense, pulsations driven by magnetopause instabilities during intervals of enhanced SW speed occur predominantly in the morning, while impulsively driven pulsations may extend over a wide range of local times. It is interesting to note that at low latitude, the occurrence of pulsations at cavity/waveguide mode frequencies is statistically higher in the afternoon (Villante et al, 2001); this feature has been interpreted in terms of SW pressure pulses associated with corotating structures, which more frequently impinge on the postnoon magnetopause.…”

Section: Introductionsupporting

confidence: 75%

Geomagnetic field fluctuations during the passage at the Earth’s orbit of the tail of the 15–16 July 2000 ejecta

2002

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Abstract. In this work we present the analysis of the geomagnetic field fluctuations observed at different ground stations (approximately along two latitudinal arrays, separated by several hours in local time) during the passage at the Earth's orbit of the tail of the 15-16 July 2000 coronal ejecta. The time interval of interest is characterized by northward interplanetary magnetic field conditions and several changes in the solar wind dynamic pressure. We found at all stations, both in the local morning and in the local evening, simultaneous and highly coherent waves at the same discrete frequencies (∼1.8 and ∼3.6 mHz) and suggest a possible interpretation in terms of global compressional modes driven by an impulsive variation of the solar wind pressure. Along the array situated in the morning sector, at the highest latitudes, the higher frequency mode seems to couple with the local field line resonance; on the other hand, along the array situated in the evening sector, the characteristics of the observed fluctuations suggest that the highest latitude station could be located at the footprint of open field lines. Our results also show that solar wind pressure variations observed during the recovery phase of the storm do not find correspondence in the geomagnetic field variations, regardless of local time and latitude; conversely, some hours later continuous solar wind pressure variations find a close correspondence in the geomagnetic field variations at all stations.

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Section: Introductionsupporting

confidence: 75%

Geomagnetic field fluctuations during the passage at the Earth’s orbit of the tail of the 15–16 July 2000 ejecta

2002

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“…Moreover, Rostoker and Sullivan (1987) reported that a large fraction of the afternoon pulsations they observed were perhaps driven by impulses in the solar wind rather than the magnetopause instabilities thought to energize the morning sector pulsations. In a survey of Pc 5 pulsation events observed with the IMAGE array, Mathie et al (1999) presented evidence of clear resonance signatures in the morning sector, but showed that FLR signatures were ill-defined closer to local noon, consistent with the scenario described by Mann et al (1999).…”

Section: Introductionmentioning

confidence: 53%

ULF waves in the outer magnetosphere: Geotail observation 1 transverse waves

Kokubun

2013

Earth Planet Sp

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A survey of ULF waves in the Pc 5 frequency range during the six year period (1995)(1996)(1997)(1998)(1999)(2000) has been made for the field line resonance waves in the outer magnetosphere, using plasma flow and magnetic field measurements with the Geotail spacecraft. On the morning side a series of wave trains often appears during several hours. In contrast such a series of wave trains with a long duration is rarely observed in the afternoon to evening sector. Most of waves in the afternoon sector are isolated, of which duration is approximately one hour. The existence of a set of preferential frequencies and the pronounced dawn-dusk asymmetry of wave occurrence and wave features, which were found in ground-based and ionospheric measurements of geomagnetic ULF pulsations, were statistically confirmed. It is also noted that the background plasma flow is sunward in the evening sector without exception. Transverse waves are generally observed in the condition of plasma β below 1.5. High β cases are mostly associated with events on the dusk side. As for the relation to solar wind conditions, Pc 5 waves tend to occur under the condition of more radial than the average IMF spiral angle, or of low cone angle.

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“…Allan et al, 1986;Samson et al, 1992;Mann et al, 1999) or Kelvin-Helmholtz instability surface waves on the flanks of the magnetopause (e.g. Southwood, 1974;Fujita et al, 1996;Engebretson et al, 1998;Rae et al, 2005) have been proposed, the spatial amplitude and phase structures of ground based magnetic field measurements during FLR events are commonly accepted due to abundant experimental evidence (e.g.…”

Section: Introductionmentioning

confidence: 99%

Statistical analysis of ground based magnetic field measurements with the field line resonance detector

et al. 2008

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Abstract. In this paper we introduce the field line resonance detector (FLRD), a wave telescope technique which has been specially adapted to estimate the spectral energy density of field line resonance (FLR) phase structures in a superposed wave field. The field line resonance detector is able to detect and correctly characterize several superposed FLR structures of a wave field and therefore constitutes a new and powerful tool in ULF pulsation studies. In our work we derive the technique from the classical wave telescope beamformer and present a statistical analysis of one year of ground based magnetometer data from the Canadian magnetometer network CANOPUS, now known as CARISMA. The statistical analysis shows that the FLRD is capable of detecting and characterizing superposed or hidden FLR structures in most of the detected ULF pulsation events; the one year statistical database is therefore extraordinarily comprehensive. The results of this analysis confirm the results of previous FLR characterizations and furthermore allow a detailed generalized dispersion analysis of FLRs.

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Excitation of magnetospheric waveguide modes by magnetosheath flows

Cited by 203 publications

References 53 publications

Geomagnetic field fluctuations during the passage at the Earth’s orbit of the tail of the 15–16 July 2000 ejecta

Geomagnetic field fluctuations during the passage at the Earth’s orbit of the tail of the 15–16 July 2000 ejecta

ULF waves in the outer magnetosphere: Geotail observation 1 transverse waves

Statistical analysis of ground based magnetic field measurements with the field line resonance detector

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