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Solar cycle variations of MIR radiation environment as observed by the LIULIN dosimeter

dc.contributor.authorDachev, T.P.
dc.contributor.authorTomov, B.T.
dc.contributor.authorMatviichuk, Y.N.
dc.contributor.authorKoleva, R.T.
dc.contributor.authorSemkova, J.V.
dc.contributor.authorPetrov, V.M.
dc.contributor.authorBenghin, V.V.
dc.contributor.authorIvanov, Y.V.
dc.contributor.authorShurshakov, V.A.
dc.contributor.authorLemaire, J.F.
dc.date1999
dc.date.accessioned2017-05-09T11:58:43Z
dc.date.available2017-05-09T11:58:43Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/5379
dc.descriptionMeasurements on board the MIR space station by the Bulgarian-Russian dosimeter LIULIN have been used to study the solar cycle variations of the radiation environment. The fixed locations of the instrument in the MIR manned compartment behind 6-15 g/cm 2 of shielding have given homogeneous series of particle fluxes and doses measurements to be collected during the declining phase of 22nd solar cycle between September 1989 and April 1994. During the declining phase of 22nd solar cycle the GCR (Galactic Cosmic Rays) flux observed at L > 4 (where L is the McIlwain parameter) has enhanced from 0.6-0.7 cm -2 s -1 up to 1.4-1.6 cm -2 s -1. The long-term observations of the trapped radiation can be summarized as follows: the main maximum of the flux and dose rate is located at the southeast side of the geomagnetic field minimum of South Atlantic Anomaly (SAA) at L = 1.3-1.4. Protons depositing few (nGy cm 2)/particle in the detector predominantly populate this region. At practically the same spatial location and for similar conditions the dose rate rises up from 480 to 1470 μGy/h dose in silicon in the 1990-1994 time interval, during the declining phase of the solar cycle. On the other hand the flux rises from 35 up to 115 cm -2 s -1 for the same period of time. A power law dependence was extracted which predicts that when the total neutral density at the altitude of the station decreases from 8 × 10 -15 to 6 × 10 -16 g/cm 3 the dose increase from about 200 μGy/h up to 1200 μGy/h. At the same time the flux increase from about 30 cm -2 s -1 up to 120 cm -2 s -1. The AP8 model predictions give only 5.8% increase of the flux for the same conditions.
dc.languageeng
dc.titleSolar cycle variations of MIR radiation environment as observed by the LIULIN dosimeter
dc.typeArticle
dc.subject.frascatiPhysical sciences
dc.audienceScientific
dc.subject.freeApproximation theory
dc.subject.freeAtmospheric temperature
dc.subject.freeCosmic rays
dc.subject.freeDosimeters
dc.subject.freeDosimetry
dc.subject.freeProtons
dc.subject.freeSilicon sensors
dc.subject.freeSpace flight
dc.subject.freeSpace stations
dc.subject.freeDose rate
dc.subject.freeGalactic cosmic rays
dc.subject.freeParticle fluxes
dc.subject.freeSolar cycle variations
dc.subject.freeTotal neutral density
dc.subject.freeSolar radiation
dc.subject.freearticle
dc.subject.freeAtlantic Ocean
dc.subject.freeatmosphere
dc.subject.freechemistry
dc.subject.freecosmic radiation
dc.subject.freeFlight Experiment
dc.subject.freeinstrumentation
dc.subject.freelong duration
dc.subject.freemanned
dc.subject.freeMir Project
dc.subject.freeradiation dose
dc.subject.freeradiation monitoring
dc.subject.freeradiometry
dc.subject.freesolar energy
dc.subject.freeSouth America
dc.subject.freespace flight
dc.subject.freetheoretical model
dc.subject.freeweightlessness
dc.subject.freeFlight Experiment
dc.subject.freelong duration
dc.subject.freemanned
dc.subject.freeMir Project
dc.subject.freeAtlantic Ocean
dc.subject.freeAtmosphere
dc.subject.freeCosmic Radiation
dc.subject.freeModels, Theoretical
dc.subject.freeRadiation Dosage
dc.subject.freeRadiation Monitoring
dc.subject.freeRadiometry
dc.subject.freeSolar Activity
dc.subject.freeSouth America
dc.subject.freeSpace Flight
dc.subject.freeSpacecraft
dc.subject.freeWeightlessness
dc.source.titleRadiation Measurements
dc.source.volume30
dc.source.issue3
dc.source.page269-274
Orfeo.peerreviewedYes
dc.identifier.doi10.1016/S1350-4487(99)00061-X
dc.identifier.scopus2-s2.0-0033237357


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