Article

# Properties of electric turbulence in the polar cap ionosphere

Geomagnetism and Aeronomy (Impact Factor: 0.49). 04/2010; 50(5):576-587. DOI: 10.1134/S001679321005004X

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B. V. Kozelov, Available from: Data provided are for informational purposes only. Although carefully collected, accuracy cannot be guaranteed. The impact factor represents a rough estimation of the journal's impact factor and does not reflect the actual current impact factor. Publisher conditions are provided by RoMEO. Differing provisions from the publisher's actual policy or licence agreement may be applicable.

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**ABSTRACT:**We analyze the dependence of the magnitude of the magnetic field, its three components, and the clock angle in the magnetosheath just in front of the magnetopause on the same values in the solar wind before a shock wave using the data of the THEMIS experiment. We take into account the time delay of the solar wind arrival at the subsolar point of the magnetopause. We obtain dependencies of the components of the magnetic field and the clock angle at the magnetopause on the corresponding quantities in the solar wind for different averaging intervals. We point to the events for which the direction of the magnetic field at the magnetopause is highly different from the direction of the magnetic field in the solar wind up to the sign change.Geomagnetism and Aeronomy 10/2012; 52(6). DOI:10.1134/S0016793212060084 · 0.49 Impact Factor - [Show abstract] [Hide abstract]

**ABSTRACT:**Scaling properties of variable electric fields in the topside ionosphere have been investigated on scales s from similar to 30 m to 2 km by FAST electric field observations with sample rate of 512 s(-1), in sixteen events of the broadband ELF turbulence. It is shown that down to scales of a few hundred meters, the power of turbulent electric fluctuations is a power law, similar to s (alpha). Scaling index alpha derived from the slope of logarithmic diagrams (LD) constructed by the discrete wavelet transform of data can be estimated as alpha = 2.2 +/- 0.3, which is close to alpha estimate earlier reported for scales 1-30 km by electric field observations of the Dynamics Explorer 2 satellite. The behavior of alpha index is analyzed near the scale of the order of electron inertial length lambda(e) = c/omega(0) (omega(0) being the electron plasma frequency). At altitudes considered (700-2500 km), lambda(e) makes 100-900 m. We demonstrate that at scales a parts per thousand currency sign lambda(e), a decrease of LD slope and deviation from the power law are typically observed. As pointed out in the discussion, this feature cannot be identified as a transition to the diffusion range, where dissipation of the turbulence occurs.Geomagnetism and Aeronomy 07/2012; 52(4-4):474-481. DOI:10.1134/S0016793212040044 · 0.49 Impact Factor