TEPC reference measurements at aircraft altitudes during a solar storm

Beck, P.; Latocha, M.; Rollet, S.; Stehno, G.

doi:10.1016/j.asr.2005.05.035

Cited by 51 publications

(35 citation statements)

References 10 publications

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“…Another possible explanation for the relative difference in the Chicago-Munich measured dose rates reported by Beck et al (2005) and our computed dose rates for the LHR-JFK flight is our use of the event-averaged incident SEP spectral fluence rate, which we employed for the purpose of isolating geomagnetic effects in our case study. It is clear from the shaded regions in Figure 9 that our event-averaged SEP spectra fluence rate is weighted more toward the peak ion flux measurements observed during SEP event 3.…”

Section: Global Sep Dose Distributionmentioning

confidence: 99%

Atmospheric Ionizing Radiation from Galactic and Solar Cosmic Rays

Mertens¹,

Kress²,

Wiltberger³

et al. 2012

Current Topics in Ionizing Radiation Research

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Section: Global Sep Dose Distributionmentioning

confidence: 99%

Atmospheric Ionizing Radiation from Galactic and Solar Cosmic Rays

Mertens¹,

Kress²,

Wiltberger³

et al. 2012

Current Topics in Ionizing Radiation Research

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“…Both calculation codes show the effective dose distribution between 7:04 and 7:16 UTC in a standard barometric altitude of 40 000 ft. Figure 4. Observation of about 40% increase and 30% decrease of the radiation exposure in 12 km due to GLE 65 and the following Forbush decrease (21) compared to the normal cosmic radiation condition before the solar storm. The mean quality factor of the radiation field for flights during normal cosmic radiation conditions is 2.2, during GLE 65 Q ¼ 2.5, and during Forbush decrease Q ¼ 2.1.…”

Section: Solar Event Calculationmentioning

confidence: 99%

“…Neutron monitor count rates related to normal conditions before the solar storm in percent from the monitors at Thule, at Rome and at the South Pole (below). GLE65, GLE66 and GLE67 occurred during these time period (21) .…”

Section: Radiation Measurements On-boardmentioning

confidence: 99%

“…Both measurements show a significant increase of the radiation exposure during the flight for a time period of up to 3 h. The total increase in terms of the radiation quantity H*(10) was about 50%. Figure 3 summarises the whole scenario of radiation exposure, including proton fluence rates measured by satellite, and ground level neutron monitor count rates during a solar storm which happened between October and November 2003 (Halloween storms) (21) . The radiation monitor used was a TEPC showing the low-and high-LET contribution separately, installed on-board a Lufthansa Airbus A340.…”

Section: Radiation Measurements On-boardmentioning

confidence: 99%

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Validation of modelling the radiation exposure due to solar particle events at aircraft altitudes

Beck

Bartlett²,

Bilski

et al. 2008

Radiation Protection Dosimetry

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Dose assessment procedures for cosmic radiation exposure of aircraft crew have been introduced in most European countries in accordance with the corresponding European directive and national regulations. However, the radiation exposure due to solar particle events is still a matter of scientific research. Here we describe the European research project CONRAD, WP6, Subgroup-B, about the current status of available solar storm measurements and existing models for dose estimation at flight altitudes during solar particle events leading to ground level enhancement (GLE). Three models for the numerical dose estimation during GLEs are discussed. Some of the models agree with limited experimental data reasonably well. Analysis of GLEs during geomagnetically disturbed conditions is still complex and time consuming. Currently available solar particle event models can disagree with each other by an order of magnitude. Further research and verification by on-board measurements is still needed.

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“…Solar energetic particles (SEPs) pose a significant radiation hazard to humans in space (Hoff, Townsend, and Zapp, 2004) and in high-flying aircraft, particularly at high latitudes (Beck et al, 2005). They may also cause serious damage to satellites (Feynman and Gabriel, 2000) and make high-frequency radio communications either difficult or impossible (Hargreaves, 2005).…”

Section: Introductionmentioning

confidence: 99%

Solar Energetic Particle Forecasting Algorithms and Associated False Alarms

2017

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Solar energetic particle (SEP) events are known to occur following solar flares and coronal mass ejections (CMEs). However, some high-energy solar events do not result in SEPs being detected at Earth, and it is these types of event which may be termed "false alarms".We define two simple SEP forecasting algorithms based upon the occurrence of a magnetically well-connected CME with a speed in excess of 1500 km s −1 (a "fast" CME) or a well-connected X-class flare and analyse them with respect to historical datasets. We compare the parameters of those solar events which produced an enhancement of > 40 MeV protons at Earth (an "SEP event") and the parameters of false alarms.We find that an SEP forecasting algorithm based solely upon the occurrence of a wellconnected fast CME produces fewer false alarms (28.8%) than an algorithm which is based solely upon a well-connected X-class flare (50.6%). Both algorithms fail to forecast a relatively high percentage of SEP events (53.2% and 50.6%, respectively).Our analysis of the historical datasets shows that false-alarm X-class flares were either not associated with any CME, or were associated with a CME slower than 500 km s −1 ; false-alarm fast CMEs tended to be associated with flare classes lower than M3.A better approach to forecasting would be an algorithm which takes as its base the occurrence of both CMEs and flares. We define a new forecasting algorithm which uses a combination of CME and flare parameters, and we show that the false-alarm ratio is similar to that for the algorithm based upon fast CMEs (29.6%), but the percentage of SEP events not forecast is reduced to 32.4%.Lists of the solar events which gave rise to > 40 MeV protons and the false alarms have been derived and are made available to aid further study.

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TEPC reference measurements at aircraft altitudes during a solar storm

Cited by 51 publications

References 10 publications

Atmospheric Ionizing Radiation from Galactic and Solar Cosmic Rays

Atmospheric Ionizing Radiation from Galactic and Solar Cosmic Rays

Validation of modelling the radiation exposure due to solar particle events at aircraft altitudes

Solar Energetic Particle Forecasting Algorithms and Associated False Alarms

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