Evaluation of the dynamic cutoff rigidity model using dosimetry data from the STS-28 flight

Smart, D. F.; Shea, M. A.; Golightly, M. J.; Weyland, M.; Johnson, A.

doi:10.1016/s0273-1177(02)00800-1

Cited by 11 publications

(11 citation statements)

References 6 publications

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“…The comparison between the computed and measured dose rate is given in Figure 4. A more detailed description of these results are given by Smart and Shea (2002) and Smart et al (2003).…”

Section: Comparisons Using Cutoff Parametersmentioning

confidence: 99%

The space-developed dynamic vertical cutoff rigidity model and its applicability to aircraft radiation dose

Smart

Shea

2003

Advances in Space Research

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“…The comparison between the computed and measured dose rate is given in Figure 4. A more detailed description of these results are given by Smart and Shea (2002) and Smart et al (2003).…”

Section: Comparisons Using Cutoff Parametersmentioning

confidence: 99%

The space-developed dynamic vertical cutoff rigidity model and its applicability to aircraft radiation dose

Smart

Shea

2003

Advances in Space Research

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“…However, the literature also reports that the cutoff latitude predicted by either the Smart et al . [] or the updated Smart and Shea [] model shows good agreement with measurement‐derived cutoff latitudes for Kp ≤ 5, with the model deviating equatorward for larger Kp [ Smart et al ., ; Rodger et al ., ; Clilverd et al ., ]. Neal et al .…”

Section: Review Of Pca Modeling Techniquesmentioning

confidence: 98%

“…[], Smart et al . [], and Neal et al . [] all show that geomagnetic cutoff latitude, which is the minimum latitude to which a solar proton of a particular energy will precipitate, tracks well with geomagnetic activity.…”

Section: Review Of Pca Modeling Techniquesmentioning

confidence: 99%

Examination of the relationship between riometer-derived absorption and the integral proton flux in the context of modeling polar cap absorption

Fiori

Danskin

2016

Space Weather

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Energetic protons can penetrate into the ionosphere increasing ionization in the D region causing polar cap absorption that may potentially block high‐frequency radio communications for transpolar flights. The protons are guided by the geomagnetic field into the high‐latitude polar cap region. Riometers monitor variations in ionospheric absorption by observing the level of background cosmic radio noise. Current polar cap absorption modeling techniques are based on the linear relationship between absorption and the square root of the integral proton flux, which has previously only been demonstrated using data from a single high‐latitude polar station. The proportionality constant describing this relationship is evaluated for two different polar cap absorption events occurring 7–11 March 2012 and 23 January 2012 to 1 February 2012. Examination of the proportionality constant using data from riometers distributed between 60° and 90° magnetic latitude reveals a previously unreported latitudinal dependence for data at magnetic latitudes of ≤66.8° on the dayside and ≤70.8° on the nightside. Incorporating the latitudinal dependence into the current D Region Absorption Prediction absorption model improves the agreement between measurement‐derived and modeled parameters by increasing the correlation coefficient between data sets, reducing the root‐mean‐square error, and reducing the bias.

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“…Equator‐ward of the cutoff, no protons below the same given energy precipitate. Rigidity cutoffs are not static and vary with geomagnetic activity [ Smart et al , 2003; Rodger et al , 2006]. However, cutoff position and dynamics (on time scales of hours or less) are inherently difficult to measure or model for a specific case.…”

Section: January 2005 Sep Event Overviewmentioning

confidence: 99%

Atmosphere‐ionosphere conductivity enhancements during a hard solar energetic particle event

et al. 2012

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, a solar energetic particle (SEP) event caused the largest recorded solar proton ground level event since 1956. Serendipitously, a balloon-borne experiment intended to measure effects of relativistic electron precipitation was aloft over Antarctica ($32 km; near 70 S, 345 E geographic) throughout the duration of the SEP event, including the fast ($6 min) onset. The balloon instrumentation included dc electric field and scalar electrical conductivity sensors. The observed conductivity increased by nearly a factor of 20 above ambient with the SEP event onset and returned to within a factor of two above normal levels within 17 h. Results from a newly developed, globally applicable atmosphere-ionosphere conductivity model based on the Sodankylä Ion and Neutral Chemistry (SIC) model suggest that proton-induced ionization was directly responsible for the observed conductivity increase at the balloon. Model input for this event included estimates of ionization from energetic particle precipitation and rigidity cutoffs.Altitudes between 20 and 150 km were considered during model runs. The results show a maximum conductivity increase near 60 km of more than 600-fold directly after SEP event onset. Relatively small conductivity enhancements (two-to fivefold) are suggested to have occurred above 70 km as a result of SEP ionization, while almost no enhancement is thought to have occurred above 95 km. These results quantify the real effect that an SEP-event can have on atmosphere-ionosphere electrical conductivity on a large, nearly global scale and provide a detailed comparison to one of the few direct stratospheric conductivity observations made during an SEP event.

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Evaluation of the dynamic cutoff rigidity model using dosimetry data from the STS-28 flight

Cited by 11 publications

References 6 publications

The space-developed dynamic vertical cutoff rigidity model and its applicability to aircraft radiation dose

The space-developed dynamic vertical cutoff rigidity model and its applicability to aircraft radiation dose

Examination of the relationship between riometer-derived absorption and the integral proton flux in the context of modeling polar cap absorption

Atmosphere‐ionosphere conductivity enhancements during a hard solar energetic particle event

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