Contents
Cosmic Research

Vol. 50, No. 2, 2012

A simultaneous English language translation of this journal is available from Pleiades Publishing, Ltd.
Distributed worldwide by Springer. Cosmic Research ISSN 0010-9525.

On the Asteroid Hazard

T. M. Eneev, R. Z. Akhmetshin, and G. B. Efimov p. 93  abstract

Concentration of Ions in the Topside Ionosphere as Measured onboard the DEMETER Satellite:
Morphology and Dependence on Solar and Geomagnetic Activity

V. A. Gladyshev, A. Yu. Shchekotov, N. V. Yagova, J.-J. Berthelier, M. Parrot,
O. S. Akent’eva, L. N. Baranskii, E. N. Fedorov, T. M. Mulyarchik, and O. A. Molchanov^† p. 103  abstract

On the Belt of Energetic Electrons at L = 2.75 in the Earth’s Magnetosphere

Yu. I. Logachev and L. L. Lazutin p. 116  abstract

Relationship between the Fluxes of Relativistic Electrons at Geosynchronous Orbit
and the Level of ULF Activity on the Earth’s Surface and in the Solar Wind
during the 23rd Solar Activity Cycle

A. S. Potapov, B. Tsegmed, and L. V. Ryzhakova p. 124  abstract

The Influence of Effects of the Heliospheric Interface on Parameters of Backscattered
Solar L Radiation Measured at the Earth’s Orbit

O. A. Katushkina and V. V. Izmodenov p. 141  abstract

Spherical Harmonic Series for Derivatives of All Orders of the Gravitational Potential
of a Planet and Their Application in Satellite Geodesy and Space Navigation

M. S. Petrovskaya and A. N. Vershkov p. 152  abstract

A Mechanism of Formation of Polar Cyclones and Possibility of Their Prediction
Using Satellite Observations

I. V. Mingalev, K. G. Orlov, and V. S. Mingalev p. 160  abstract

Investigation of the Effectiveness of an Algorithm of Active Magnetic Damping

M. Yu. Ovchinnikov, V. I. Pen’kov, D. S. Roldugin, and S. O. Karpenko p. 170  abstract

Motion of a Descent Capsule Relative to Its Center of Mass when Deploying
the Orbital Tether System

Yu. M. Zabolotnov and O. N. Naumov p. 177  abstract

Chaotic Oscillations of Spacecraft with an Elastic Radially Oriented Tether

V. S. Aslanov and A. S. Ledkov p. 188  abstract

SHORT COMMUNICATIONS

Elliptic Orbits and Satellite Constellations for Coverage of Illuminated Areas

Yu. P. Ulybyshev p.199  abstract

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