Relativistic electron fluxes and dose rate variations observed on the international space station

Dachev, Ts.; Tomov, B.; Matviichuk, Yu.; Dimitrov, P.; Bankov, N.; Reitz, G.; Horneck, G.; Häder, Donat-Peter; Lebert, Michael; Schuster, Martin

doi:10.1016/j.jastp.2012.07.007

Cited by 13 publications

(10 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The dynamics of the ORB doses measured for the whole EXPOSE-mission periods confirm conclusions made by Dachev et al (2013) that the ORB relativistic electrons are common on the ISS. Therefore, we were not able to compare them with any other measurement.…”

Section: Discussionsupporting

confidence: 81%

“…These enhancements occur mainly after magnetic storms. The variations of the R3DE/R ORB daily fluences and dose rates have already been studied earlier (Dachev et al 2012a, b, 2013; Dachev 2013a).…”

Section: Resultsmentioning

confidence: 87%

“…The most interesting phenomenon observed in this period were the relativistic electron fluxes and dose rate variations during April–May 2010 geomagnetic disturbances. These variations in the R3DR data on the ISS were connected with the second largest fluence of electrons with energies >2 MeV in the history of the Global Geostationary Weather Satellite (GOES) measurements (Dachev et al 2012a, 2013; Dachev 2013a).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

EXPOSE-R cosmic radiation time profile

Dachev

Horneck²,

Häder

et al. 2014

International Journal of Astrobiology

View full text Add to dashboard Cite

The aim of the paper is to present the time profile of cosmic radiation exposure obtained by the radiation risks radiometer-dosimeter (R3DR) during the ESA exposition facility for EXPOSE-R mission (EXPOSE-R) in the EXPOSE-R facility outside the Russian Zvezda module of the International Space Station (ISS). Another aim is to make the obtained results available to other EXPOSE-R teams for use in their data analysis. R3DR is a low mass and small dimensions automated device, which measures solar radiation in four channels and in addition cosmic ionizing radiation. The main results of cosmic ionizing radiation measurements are: three different radiation sources were detected and quantified: galactic cosmic rays (GCR), energetic protons from the inner radiation belt (IRB) in the region of the South Atlantic anomaly and energetic electrons from the outer radiation belt (ORB). The highest daily averaged absorbed dose rate of 506 μGy day − 1 came from IRB protons; GCR delivered much smaller daily absorbed dose rates of 81.4 μGy day − 1 on average, and ORB source delivered on average a dose rate of 89 μGy day − 1 . The IRB and ORB daily averaged absorbed dose rates were higher than those observed during the ESA exposition facility for EXPOSE-E mission (EXPOSE-E), whereas the GCR rate was smaller than that measured during the EXPOSE-E mission. The reason for this difference is much less surrounding constructions shielding of the R3DR instrument in comparison with the R3DE instrument.

show abstract

Section: Discussionsupporting

confidence: 81%

Section: Resultsmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

EXPOSE-R cosmic radiation time profile

Dachev

Horneck²,

Häder

et al. 2014

International Journal of Astrobiology

View full text Add to dashboard Cite

show abstract

“…Here the flux of relativistic electrons can change by a factor of 100 or more on a variety of timescales ranging from minutes to tens of days [e.g., Blake et al , ; Baker et al , ]. Understanding how these so‐called “killer” electrons behave is important since enhanced fluxes of relativistic electrons damage satellites [ Wrenn , ; Baker , ; Wrenn et al , ] and pose a risk to astronauts on extravehicular activities [e.g., Dachev et al , ].…”

Section: Introductionmentioning

confidence: 99%

Global morphology and spectral properties of EMIC waves derived from CRRES observations

et al. 2014

View full text Add to dashboard Cite

Gyroresonant wave-particle interactions with electromagnetic ion cyclotron (EMIC) waves are a potentially important loss process for relativistic electrons in the Earth's radiation belts. Here we perform a statistical analysis of the EMIC waves observed by the Combined Release and Radiation Effects Satellite (CRRES) to determine the global morphology and spectral properties of the waves and to help assess their role in radiation belt dynamics. Helium band EMIC waves, with intensities, B 2 w , greater than 0.1 nT 2 , are most prevalent during active conditions (AE > 300 nT), from 4 < L * < 7 in the afternoon sector, with an average percentage occurrence of 2.7%. Hydrogen band EMIC wave events, with intensities greater than 0.1 nT 2 , are also most prevalent in the afternoon sector during active conditions in the same region, but they are less frequent with an average percentage occurrence of 0.6%. The average intensity of the helium and hydrogen band EMIC waves in the region 4 < L * < 7 in the afternoon sector during active conditions is 2 nT 2 and 0.5 nT 2 , respectively, and suggests that the waves can cause strong diffusion. However, the time-averaged properties are very different, being a factor of 30-50 lower for helium and hydrogen band EMIC waves, respectively, suggesting that the overall effect will be correspondingly weaker. Nevertheless, the moderate and strong EMIC wave events with B 2 w > 0.1 nT 2 reported on here will contribute to relativistic electron loss in the Earth's radiation belts and should be included in radiation belt models.

show abstract

“…Radiation hardness against high-energy electrons plays an important role, particularly for space applications. The electronics in the spacecraft is exposed to electrons with energies of a few MeV and up to fluences of 10 10 cm −2 day −1 sr −1 (1). High radiation hardness is also required for other experiments.…”

Section: Introductionmentioning

confidence: 99%

Influence of electron irradiation on properties of semi-insulating GaAs detectors

Šagátová

Затько

Sedlačková

et al. 2014

Radiation Effects and Defects in Solids

View full text Add to dashboard Cite

The effects of electron beam irradiation on electrical and spectrometric properties of semi-insulating (SI) GaAs detectors were studied. The electric properties were monitored by reverse and forward currentvoltage characteristics. In general, a breakdown voltage decrease with the dose was observed. However, some samples showed a local increase in the breakdown voltage at doses between 5 and 10 kGy. The detector spectrometric properties (the charge collection efficiency (CCE), the energy resolution and the detection efficiency) were evaluated from measured spectra of the 241 Am radionuclide gamma source before and after electron irradiation. The CCE and energy resolution showed minor changes after irradiation. The detection efficiency noticed an initial increase (up to a dose of 5 kGy) followed by a permanent decrease. At 30 kGy, the overall degradation of detector functionality was observed with all samples.

show abstract

Relativistic electron fluxes and dose rate variations observed on the international space station

Cited by 13 publications

References 29 publications

EXPOSE-R cosmic radiation time profile

EXPOSE-R cosmic radiation time profile

Global morphology and spectral properties of EMIC waves derived from CRRES observations

Influence of electron irradiation on properties of semi-insulating GaAs detectors

Contact Info

Product

Resources

About