Space-ground radio interferometer RadioAstron

Andreyanov, V. V.; Кардашев, Н. С.; Хартов, В. В.

doi:10.1134/s0010952514050013

Cited by 10 publications

(8 citation statements)

References 2 publications

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“…Solar wind instrument suite Plasma‐F [ Zelenyi et al , ] is a payload of opportunity onboard Spectr‐R Russian radio astronomy mission [ Andreyanov et al , ] launched on 18 July 2011 on a highly elliptic orbit with apogee almost at a Moon orbit [ Kardashev et al , ]. Plasma‐F includes fast solar wind flow spectrometer [ Zastenker et al , ], energetic particle spectrometer [ Baláž et al , ], and data storage unit.…”

Section: Instrumentation and Datamentioning

confidence: 99%

Oscillations of energetic ions flux near the Earth's bow shock

et al. 2015

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A new type of variability in the foreshock and magnetosheath is revealed with the recent energetic particle experiments monitor of electrons and protons (MEP) onboard Spectr‐R spacecraft and solid‐state telescope onboard Time History of Events and Macroscale Interactions during Substorms spacecraft, which have high time resolution. Oscillations of energetic ion fluxes are observed in the broad energy range ∼4–400 keV, with periods 10–30 s, often rather monochromatic waveform and accompanied with magnetic oscillations. Such events are not so rare (∼100 cases are found for 2007–2012) but are associated mostly with high‐speed solar wind.

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Section: Instrumentation and Datamentioning

confidence: 99%

Oscillations of energetic ions flux near the Earth's bow shock

et al. 2015

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Section: Imaging With Radioastronmentioning

confidence: 99%

“…The data are recorded at a rate of 128 Megabits per second, providing a total bandwidth of up to 32 MHz per circular polarization channel (Andreyanov et al 2014). The satellite telemetry and science data are received and recorded at tracking stations in Puschino (Andreyanov et al 2014) and Green Bank (Ford et al 2014) and later transferred for correlation at one of the RadioAstron correlation facilities. Accurate reconstruction of the orbit and of the momentary state vector of the Spektr-R spacecraft is achieved by combining together radiometric range and radial velocity measurements made at the satellite control stations in Bear Lakes and Ussurijsk (Russia), Doppler measurements obtained at each of the tracking stations, and laser ranging and optical astrometric measurements of the spacecraft position in the sky Zakhvatkin et al 2014).…”

Section: Imaging With Radioastronmentioning

confidence: 99%

RadioAstron space VLBI imaging of polarized radio emission in the high-redshift quasar 0642+449 at 1.6 GHz

Lobanov

Gómez

Bruni

et al. 2015

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Context. Polarization of radio emission in extragalactic jets at a sub-milliarcsecond angular resolution holds important clues for understanding the structure of the magnetic field in the inner regions of the jets and in close vicinity of the supermassive black holes in the centers of active galaxies. Aims. Space VLBI observations provide a unique tool for polarimetric imaging at a sub-milliarcsecond angular resolution and studying the properties of magnetic field in active galactic nuclei on scales of less than 10 4 gravitational radii. Methods. A space VLBI observation of high-redshift quasar TXS 0642+449 (OH 471), made at a wavelength of 18 cm (frequency of 1.6 GHz) as part of the early science programme (ESP) of the RadioAstron mission, is used here to test the polarimetric performance of the orbiting Space Radio Telescope (SRT) employed by the mission, to establish a methodology for making full Stokes polarimetry with space VLBI at 1.6 GHz, and to study the polarized emission in the target object on sub-milliarcsecond scales. Results. Polarization leakage of the SRT at 18 cm is found to be within 9% in amplitude, demonstrating the feasibility of high fidelity polarization imaging with RadioAstron at this wavelength. A polarimetric image of 0642+449 with a resolution of 0.8 mas (signifying an ∼4 times improvement over ground VLBI observations at the same wavelength) is obtained. The image shows a compact corejet structure with low (≈2%) polarization and predominantly transverse magnetic field in the nuclear region. The VLBI data also uncover a complex structure of the nuclear region, with two prominent features possibly corresponding to the jet base and a strong recollimation shock. The maximum brightness temperature at the jet base can be as high as 4 × 10 13 K.

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“…The sampled wideband video signal generated by the shaper [4] is used as input data during the correla tion processing. Because of the high information con tent (~128 Mb/s), this stream can be transmitted to the Earth only via VIRK.…”

Section: Composition and Channels Of Ose Status Transmissionmentioning

confidence: 99%

Monitoring and control of onboard scientific equipment of the space radio telescope

et al. 2015

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This paper outlines the methods used at the ASC LPI for generating instruction sequences that control operation modes of the onboard scientific equipment and describes the means for timely receipt of information about the current state of the onboard equipment, thus making it possible to quickly assess the adequacy of the selected modes for the solution of scientific problems and respond to emergency situations. The main points of interaction with other subsystems and their controls are briefly described.

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Space-ground radio interferometer RadioAstron

Cited by 10 publications

References 2 publications

Oscillations of energetic ions flux near the Earth's bow shock

Oscillations of energetic ions flux near the Earth's bow shock

RadioAstron space VLBI imaging of polarized radio emission in the high-redshift quasar 0642+449 at 1.6 GHz

Monitoring and control of onboard scientific equipment of the space radio telescope

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