Variations of the radiation dose onboard Mir station

Panasyuk, M. I.; Teltsov, M. V.; Shumshurov, V. I.; Tsetlin, V. V.

doi:10.1016/s0273-1177(98)00006-4

Cited by 4 publications

(3 citation statements)

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“…The disturbances in the operation of scientific equipment are determined in [ Dmitriev et al , 2002] as increases of the daily probability of errors in the data from the gas discharge counter ( Z 1) or in the data from the scintillation detector NaI ( Z 2) that is more than one root mean square deviation (RMSD) of their average values, that is, >0.051 and >0.061, respectively, in logarithmic scale. The radiation doses D 1 and D 2 were measured on board the Mir station [ Panasyuk et al , 1998; Tverskaya et al , 2004] under equivalent aluminum shields of 4.5 g/cm 2 and 2 g/cm 2 . Therefore the doses are produced by protons with energies E > 70 MeV and E > 40 MeV, respectively, and by electrons with energies E > 8.5 MeV and E > 4 MeV, respectively.…”

Section: Space Weather Disturbancesmentioning

confidence: 99%

Interplanetary sources of space weather disturbances in 1997 to 2000

2005

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[1] Seventy-five disturbed intervals from 1997 through 2000 were analyzed and selected on the basis of space weather effect occurrences such as significant compression of the dayside magnetosphere, strong magnetic storms, ionospheric perturbations, relativistic electron enhancements, and increases in the rate of data failures and radiation doses on board the Mir station. Solar wind disturbances were considered as the main factor influencing the Earth's magnetosphere. We distinguished four geoeffective interplanetary (IP) phenomena: interplanetary coronal mass ejections (ICME), interplanetary forward shocks with compressed region (IS), fast solar wind streams from coronal holes (CH), and corotating interaction regions (CIR) between the CH and relatively slow ambient solar wind. Each selected interval was studied and classified under the IP phenomena that it was a direct consequence of. It was found that IP phenomena ''containing'' ISs, ICMEs, and CIRs were mostly responsible for geosynchronous magnetopause crossings, strong geomagnetic storms, and intensification of geomagnetically induced currents. The fast solar wind streams from coronal holes controlled mainly geosynchronous relativistic electron enhancements. The rate of data failures and variations of the radiation dose on board the Mir station were related to both IS-ICME and CIR-CH phenomena. Such a relationship was interpreted in terms of (1) decrease of cutoff threshold for solar energetic particles due to the magnetospheric compression and/or ring current intensification on the main phase of geomagnetic storms and (2) intensive relativistic electron precipitation from the outer radiation belt and its contribution to the radiation conditions at low altitudes during recovery phase of recurrent magnetic storms.

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Section: Space Weather Disturbancesmentioning

confidence: 99%

Interplanetary sources of space weather disturbances in 1997 to 2000

2005

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“…The doses increased by $80% in chamber D2 (E p > 40 MeV) and by $30% in chamber D1 (E p >70 MeV), which corresponds approximately to the ratio of dose increases in similar energy ranges recorded on CRRES (Gussenhoven et al, 1991). The later history of the new belt is difficult to trace in the Mir measurement data because its effect was ''overlapped'' from mid-1992 by the effect of dose increase due to the solar cycle variations of the inner belt proton intensity (Panasyuk et al, 1998). At the same time, the new belt is known to be observable during a few years (Ginzburg et al, 1993).…”

Section: Radiation Belt Variationsmentioning

confidence: 59%

The features of radiation dose variations onboard ISS and Mir space station: comparative study

Tverskaya

Panasyuk

Reizman

et al. 2004

Advances in Space Research

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“…Also, because most of the flights are at low altitude, the estimated trapped dose rate is sensitive to the correction applied for the galactic cosmic ray (GCR) contribution to the total TLD dose rate (GCR dose rate Total dose rate). Panasyuk et al [20] qualitatively examined the time variation of the absorbed dose rate on Mir station for the five years from January 1991 to December 1995 and suggested that the trapped particle dose rate has a seasonal dependence, reaching maximum values in summer in the northern hemisphere. They suggested that this is due to the known seasonal variation of the atmospheric density and would be more pronounced at 800 km than at 400 km.…”

Section: Introductionmentioning

confidence: 99%

Solar modulation of dose rate onboard the Mir station

Badhwar

Shurshakov

Tstelin³

1997

IEEE Trans. Nucl. Sci.

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Models of the radiation belts that are currently used to estimate exposure for astronauts describe the environment at times of either solar minimum or solar maximum. Static models, constructed using data acquired prior to 1970 during a solar cycle with relatively low solar radio flux, have flux uncertainties of a factor of two to five and dose-rate uncertainties of a factor of about two. The inability of these static models to provide a dynamic description of the radiation belt environment limits our ability to predict radiation exposures for long-duration missions in low earth orbits. In an attempt to add some predictive capability of these models, we studied the measured daily absorbed dose rate on the Mir orbital station over roughly the complete 22nd solar cycle that saw some of the highest solar flux values in the last 40 y. We show that the daily trapped particle dose rate is an approximate power law function of daily atmospheric density. Atmospheric density values are in turn obtained from standard correlation with observed solar radio noise flux. This correlation improves, particularly during periods of high solar activity, if the density at roughly 400 days earlier time is used. This study suggests the possibility of a dose-and flux-predictive trapped-belt model based on atmospheric density.

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Variations of the radiation dose onboard Mir station

Cited by 4 publications

References 1 publication

Interplanetary sources of space weather disturbances in 1997 to 2000

Interplanetary sources of space weather disturbances in 1997 to 2000

The features of radiation dose variations onboard ISS and Mir space station: comparative study

Solar modulation of dose rate onboard the Mir station

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