Pressure balance on the magnetopause near the subsolar point according to observational data of the THEMIS project satellites

Znatkova, S.S.; Антонова, Е. Е.; Zastenker, G. N.; Kirpichev, I. P.

doi:10.1134/s0010952510061048

Cited by 15 publications

(6 citation statements)

References 13 publications

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“…In the current study MIPM coordinates are calculated for the time intervals with 17‐min duration. Thus, resulting values do not include fast oscillations of the boundaries' position (e.g., Nikolaeva et al, ; Znatkova et al, ). This may result in values of F MIPM that lie outside of the range [0, 1].…”

Section: Methodsmentioning

confidence: 99%

Kinetic‐Scale Ion Flux Fluctuations Behind the Quasi‐Parallel and Quasi‐Perpendicular Bow Shock

et al. 2018

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Properties of kinetic‐scale plasma turbulence are examined observationally with the help of Spektr‐R measurements in the Earth's magnetosheath. The statistics covers 6 years of ion flux measurements during years 2011–2017 and includes a few dozens of the magnetosheath crossings with total duration of 250 hr. Several types of Fourier spectra are distinguished in the magnetosheath according to a spectral shape at the scales of transition from magnetohydrodynamic to kinetic regimes. Spectral indices and occurrence rate of different spectral shapes are examined at different locations with respect to the magnetosheath boundaries—the magnetopause and the bow shock. Magnetosheath plasma behind the quasi‐parallel and quasi‐perpendicular bow shock is explored separately. Clear dynamics of spectral shapes across the magnetosheath is shown: spectra with broad bump at the transition frequencies occur more frequently in the vicinity of the bow shock, while spectra with plateau at the same frequencies are usually observed closer to the magnetopause. Spectral indices such as spectral slope at the kinetic scales and break frequency are shown to be weakly affected by the boundaries behind the quasi‐perpendicular bow shock. The steepest spectra are observed close to the quasi‐parallel bow shock.

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Section: Methodsmentioning

confidence: 99%

Kinetic‐Scale Ion Flux Fluctuations Behind the Quasi‐Parallel and Quasi‐Perpendicular Bow Shock

et al. 2018

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“…As it can be seen in Fig. 11 the total plasma pressure inside and outside magnetosphere is well balanced for all analyzed crossings of the magnetopause just as in the cases discussed by Znatkova et al (2011). The main difference of the events July 22, 2007 and July 18, 2007 is connected to the total pressure dynamics.…”

Section: Pressure Balance At the Magnetopausementioning

confidence: 48%

“…The main difference of the events July 22, 2007 and July 18, 2007 is connected to the total pressure dynamics. The total pressure is nearly constant for the event July 18, 2007 discussed by Znatkova et al (2011). The total pressure growth is observed for the event July 22, 2007.…”

Section: Pressure Balance At the Magnetopausementioning

confidence: 58%

“…An analysis of the pressure balance on the magnetopause near the subsolar point was made for 18 crossings of the magnetopause by the THEMIS project satellites under magneto-quiet conditions by Znatkova et al (2011). Dynamic and static pressures of plasma are determined, as well as magnetic pressure in the magnetosheath, and magnetic and plasma static pressure inside the magnetosphere.…”

Section: Pressure Balance At the Magnetopausementioning

confidence: 99%

“…Nevertheless, the same fluctuations at high latitudes, where the magnetic field at the magnetic field line is much smaller than the magnetic field at the subsolar point, the contribution of fluctuations of magnetic pressure is comparable with the magnetic pressure inside the magnetosphere. The total pressure inside the magnetopause is calculated as a sum of static and magnetic pressure in accordance with the relation P int =P  +(B 2 /2 0 ), where  0 is the magnetic permeability of vacuum; the integral pressure in the magnetosheath as a sum of dynamic, static and magnetic pressure P int = n p m p (v p ) 2 + P  +(B 2 /2 0 ) (see the results of Phan et al (1994) and discussion in (Znatkova et al, 2011)), where n p and v p are density and velocity (mainly X-component) of protons, m i is the mass of proton, P  is the component of plasma pressure perpendicular to the magnetic field line. Fig.…”

Section: Pressure Balance At the Magnetopausementioning

confidence: 99%

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Turbulence in the Magnetosheath and the Problem of Plasma Penetration Inside the Magnetosphere

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Ion leakage at dayside magnetopause in case of high and low magnetic shears

2017

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The nature of energetic ions in the magnetosheath of the Earth is studied using the data of the Time History of Events and Macroscale Interactions during Substorms mission. Three intervals of the multiple crossings of the magnetopause during northward orientation of the interplanetary magnetic field and quiet geomagnetic conditions were selected to illustrate the behavior of ion distribution functions near the subsolar region in case of high and low magnetic shears. For all analyzed events, the velocity and thickness of the magnetopause was estimated using the simultaneous measurements in two satellites. The ion spectra in the magnetosphere and magnetosheath were fitted by kappa and bi‐kappa distributions, respectively. It was found that during high shear events the energetic part of the ion spectra is practically identical inside and outside the magnetopause. On the other side, for low shear events the energetic fluxes of ions in the magnetosheath are lower. We argue that in case of high magnetic shear, the magnetopause becomes transparent when the ion Larmor radii is comparable or larger than the thickness of the magnetopause. It may explain coincidence of the energetic part of spectra inside and outside the magnetosphere. We discuss the reason for the changes of spectra at low magnetic shear.

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Pressure balance on the magnetopause near the subsolar point according to observational data of the THEMIS project satellites

Cited by 15 publications

References 13 publications

Kinetic‐Scale Ion Flux Fluctuations Behind the Quasi‐Parallel and Quasi‐Perpendicular Bow Shock

Kinetic‐Scale Ion Flux Fluctuations Behind the Quasi‐Parallel and Quasi‐Perpendicular Bow Shock

Turbulence in the Magnetosheath and the Problem of Plasma Penetration Inside the Magnetosphere

Ion leakage at dayside magnetopause in case of high and low magnetic shears

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