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Glaßmeier, Karl‐Heinz; Othmer, Carsten; Cramm, R.; Stellmacher, Martin; Engebretson, M. J.

doi:10.1023/a:1006659717963

Cited by 55 publications

(26 citation statements)

References 102 publications

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“…Note that the amplitudes of the fundamental mode and of the first harmonic appear to be comparable in the ground observations, as is seen, e.g., in Figure 4d. The reason for the large amplitude of the first harmonic oscillation may be smaller ionospheric impedance on shorter magnetic field lines, when field line resonance effects [e.g., Takahashi et al, 1996;Glassmeier et al, 1999] are more dramatic. Thus, it is important to study how the magnetosphere-ionosphere transmission of the Pi2 pulsations down to Earth is organized in more detail.…”

Section: Discussionmentioning

confidence: 99%

Anharmonic oscillatory flow braking in the Earth's magnetotail

Panov

Wolf

Kubyshkina

et al. 2015

Geophysical Research Letters

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Plasma sheet bursty bulk flows often oscillate around their equilibrium position at about 10 RE downtail. The radial magnetic field, pressure, and flux tube volume profiles usually behave differently earthward and tailward of this position. Using data from five Time History of Events and Macroscale Interactions during Substorms (THEMIS) probes, we reconstruct these profiles with the help of an empirical model and apply thin filament theory to show that the oscillatory flow braking can occur in an asymmetric potential. Thus, the thin filament oscillations appear to be anharmonic, with a power spectrum exhibiting peaks at both the fundamental frequency and the first harmonic. Such anharmonic oscillatory braking can explain the presence of the first harmonic in Pi2 pulsations (frequency doubling), which are simultaneously observed by magnetometers on the ground near the conjugate THEMIS footprints.

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Section: Discussionmentioning

confidence: 99%

Anharmonic oscillatory flow braking in the Earth's magnetotail

Panov

Wolf

Kubyshkina

et al. 2015

Geophysical Research Letters

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“…On a final note, Glaβmeier et al (1999) note that: "definitive proof of the existence of magnetospheric field line resonances requires detailed consideration of Poynting fluxes in the resonance region where isotropic energy flow is converted into field-aligned energy flow. Such an observation has not yet been reported and field line resonances need to be regarded as a well argued conjecture, but not as a proven phenomenon" R05 presented the definitive existence of a toroidal mode FLR, by detailing magnetospheric observations of the electric and magnetic field structure of the FLR whilst the Polar spacecraft was conjugate to the "Churchill Line" of the CARISMA magnetometer array.…”

Section: Discussionmentioning

confidence: 99%

Energy deposition in the ionosphere through a global field line resonance

et al. 2007

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Abstract.We present an interval whereby we can estimate the energy dissipation in the ionosphere through an externally-driven field line resonance. In this paper, we utilise an interval described in general by Rae et al. (2005), where the global magnetospheric cavity was shown to be energised via a high solar wind speed stream. Using the ground-based instrumentation available, we estimate the spatial extent of the generated pulsations to be at least 10 • in latitude and 65 • in longitude, a sizeable fraction of the dusksector ionosphere. Using a fortuitous conjunction with the Polar spacecraft, we compare point measurements of the net downward Poynting vector to the estimated Joule heating rate in the ionosphere, and find that model values of the Pedersen conductance are reasonable. In the interval of interest, we estimate the total dissipation rate during a global field line resonance to be comparable to that reported in substorm studies. Previous studies have estimated the total energy deposition via field line resonance to be up to 4% of that deposited during a small substorm. However, in this paper we find that the total energy deposited via Joule heating may actually be 30% or more of the energy deposited in the ionosphere during a substorm cycle using a conservative estimate of the pulsation duration.+

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“…In addition to the ground magnetometer studies (Samson et al 1971), radar studies (Walker et al 1979;Ruohoniemi et al 1991), and optical studies (Samson et al 1996) of FLRs, satellite measurements by Ogo 5 (Kokubun et al 1976), GOES (Lin and Barfield 1985), ISEE (Singer et al 1982), DE1 (Cahill et al 1986), AMPTE (Anderson et al 1990), Geotail (Sakurai et al 2001), Polar (Keiling et al 2003), FAST (Lotko et al 1998), and Cluster (Zheng et al 2006) provide a wealth of in situ magnetospheric observations. For a review on FLRs see Glassmeier et al (1999) or Takahashi (1998), or for a historical perspective see Hughes (1994).…”

Section: Pc 5 Field Line Resonancesmentioning

confidence: 99%

THEMIS ESA First Science Results and Performance Issues

et al. 2008

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Early observations by the THEMIS ESA plasma instrument have revealed new details of the dayside magnetosphere. As an introduction to THEMIS plasma data, this paper presents observations of plasmaspheric plumes, ionospheric ion outflows, field line resonances, structure at the low latitude boundary layer, flux transfer events at the magnetopause, and wave and particle interactions at the bow shock. These observations demonstrate the capabilities of the plasma sensors and the synergy of its measurements with the other THEMIS experiments. In addition, the paper includes discussions of various performance issues with the ESA instrument such as sources of sensor background, measurement limitations, and data formatting problems. These initial results demonstrate successful achievement of all measurement objectives for the plasma instrument.

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Cited by 55 publications

References 102 publications

Anharmonic oscillatory flow braking in the Earth's magnetotail

Anharmonic oscillatory flow braking in the Earth's magnetotail

Energy deposition in the ionosphere through a global field line resonance

THEMIS ESA First Science Results and Performance Issues

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