Processes of Relaxation in the Ultraviolet Band Spectrum by High Velocity Interaction of Exhaust Products on ISS (Relaksatsia-Groza (Relaxation-Thunderstorm)) - 09.02.15

Overview | Description | Applications | Operations | Results | Publications | Imagery

ISS Science for Everyone

Science Objectives for Everyone
Relaksatsiya (Relaxation) makes UV spectrometer observations of the chemiluminescent reactions in the Xenon plasma from firings of the two PCUs (plasma contactor units) installed on the U.S. Z1 truss.
Science Results for Everyone
Spacecraft light, spacecraft bright. This investigation measures light-emitting phenomena, including those from spacecraft plasma and re-entry spacecraft fragments. Data are also collected on origin and development of global thunderstorm phenomena in Earth’s upper atmosphere, including elves, sprites, and jets. Some measurements reveal a splitting of oxygen atoms in atmospheric layers over seismically active areas where Earth’s tectonic plates converge. Overall, the experiments demonstrate the effectiveness of using UV spectral measurements to monitor natural and man-made global physical phenomena and geophysical conditions in Earth's atmosphere and near-Earth space.

The following content was provided by N. A. Anfimov, Ph.D., Yuri A. Plastinin, V. N. Sychyov, and is maintained in a database by the ISS Program Science Office.
Experiment Details


Principal Investigator(s)
N. A. Anfimov, Ph.D., Russia
Yuri A. Plastinin, TSNIIMASH, Moscow, Russia
V. N. Sychyov, Institute of Medical and Biological Problems of Russian Academy of Sciences (IMBP RAS), Russia

Information Pending

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Sponsoring Space Agency
Russian Federal Space Agency (Roscosmos)

Sponsoring Organization
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Research Benefits
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ISS Expedition Duration 1
December 2001 - December 2002; November 2002 - May 2003; April 2003 - September 2015

Expeditions Assigned

Previous ISS Missions
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Experiment Description

Research Overview
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Investigation of chemiluminescent chemical reactions and atmospheric optical phenomena occurring during high-speed interaction between jet engine exhausts and the Earth's upper atmosphere, atmospheric optical phenomena during re-entry of bodies into rarified upper atmosphere and its optical properties in the UV range.

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Space Applications
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Earth Applications
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Operational Requirements
UV camera, Spectrometer, Video camera, set of interference filters.

Operational Protocols
Conducting radiometric and spectrometric measurements in the UV range: Radiation emitted in reactions of interaction between ISS RS propulsion system exhaust products and atomic oxygen; Radiation emitted in reactions of interaction of Soyuz and Progress propulsion system exhaust products during undocking maneuvers, retroburns and re-entry into the Earth's upper atmosphere; Spacial distribution and emission spectra of atmospheric formations and phenomena.

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Results/More Information

Determining the effects of propulsion system exhausts on the Earth's upper atmosphere and ISS environment on optically sensitive surfaces (windows, equipment lenses, solar array panels). In perspective, simulation of atmospheric optical phenomena in ultra-violet, visible and near-infrared spectral bands (Earth atmosphere nightglow, SC re-entry glow, planetary atmospheric glow).

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Results Publications

    Karabadzhak GF, Komrakov GP, Kuznetsov VD, Plastinin YA, Ruzhin YY, Frolov VL, Khmelinin BA.  ISS-based  study of global spatiotemporal glowing of the Earth`s upper atmosphere and ionosphere under radiofrequency emission impact on them . Kosmonavtika i Raketostroenie (Cosmonautics and Rocket Engineering). 2009; 57(4): 88-94.

    Karabadzhak GF, Plastinin YA, Rodionov AV, Szhenov EY, Sipachev GF, Khmelinin BA.  Spectrosegmental Studies in Superlow Natural and Man-Made Emissions in the Earth Upper Atmosphere and Ionosphere. Kosmonavtika i Raketostroenie (Cosmonautics and Rocket Engineering). 2007; 49(4): 26-32.

    Karabadzhak GF.  Revelation of the effective cross-section of the O + H2O = OH (A) + OH (X) reaction during hypervelocity collisions of components by measuring the intensity of hydroxyl glow in the course of space experiments. Kosmonavtika i Raketostroenie (Cosmonautics and Rocket Engineering). 2004; 36(3): 123-130.

    Plastinin YA, Karabadzhak GF, Khmelinin BA.  Remote Measurement of the atomic oxygen distribution in Earth atmosphere from International Space Station. 46th Aerospace Sciences Meeting and Exhibit, Reno, NV; 2008

    Anfimov NA, Zemlyanskiy BA, Karabadzhak GF, Plastinin YA.  Study of Earth's atmosphere and ionosphere from the ISS. Polyot. 2007(12): 3-10.

    Karabadzhak GF, Krasotkin VS, Manzhaley AI, Plastinin YA, Khmelinin BA.  ISS-based observation of a European ATV cargo vehicle entering the Earth's atmosphere with the Fialka–MV-Kosmo multispectral system  . Kosmonavtika i Raketostroenie (Cosmonautics and Rocket Engineering). 2010; 59(2).

    Zemlyanskiy BA, Karabadzhak GF, Plastinin YA.  The Relaxation Space Experiments: Scientific Objectives, Instruments and Results of the Studies at the International Space Station Russian Segment. Kosmonavtika i Raketostroenie (Cosmonautics and Rocket Engineering). 2007; 49(4): 33-40.

    Plastinin YA, Rizvanov AA, Sipachev GF, Khmelinin BA.  Space-based UV survey of  thunderous  formations  in the Earth's upper atmosphere . Kosmonavtika i Raketostroenie (Cosmonautics and Rocket Engineering). 2011; 63(2): 123-132.

    Karabadzhak GF, Plastinin YA, Szhenov EY, Khmelinin BA.  Specification of oxygen atom concentration profiles in Earth`s upper atmosphere basing on experimental data received from manned space stations . Kosmonavtika i Raketostroenie (Cosmonautics and Rocket Engineering). 2007; 46(1): 38-43.

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Ground Based Results Publications

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ISS Patents

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Related Publications

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Related Websites
Energia - Science Research on the ISS Russian Segment

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image Fialka-MV-Kosmos multispectral UV system.
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