Modeling spacecraft safe mode events

Imken, Travis; Randolph, Thomas; DiNicola, Michael; Nicholas, Austin

doi:10.1109/aero.2018.8396383

Cited by 20 publications

(4 citation statements)

References 5 publications

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“…Rapid changes in solar wind conditions have a direct impact on Earth's magnetosphere (e.g., Meziane et al 2014), ionosphere (e.g., Milan et al 2007), and both ground-based and space-based technology (e.g., Imken et al 2018;Baker et al 2004;Doherty et al 2004). Estimates of economic impact of space weather on European power grids alone range from €10s-100s billion (e.g., Eastwood -2et al 2018).…”

Section: Introductionmentioning

confidence: 99%

An inner boundary condition for solar wind models based on coronal density

Bunting¹,

Morgan²

2022

J. Space Weather Space Clim.

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Accurate forecasting of the solar wind has grown in importance as society becomes increasingly dependent on technology that is susceptible to space weather events. This work describes an inner boundary condition for ambient solar wind models based on tomography maps of the coronal plasma density gained from coronagraph observations, providing a novel alternative to magnetic extrapolations. The tomographical density maps provide a direct constraint of the coronal structure at heliocentric distances of 4 to 8 Rs, thus avoiding the need to model the complex non-radial lower corona. An empirical inverse relationship converts densities to solar wind velocities which are used as an inner boundary condition by the Heliospheric Upwind Extrapolation (HUXt) model to give ambient solar wind velocity at Earth. The dynamic time warping (DTW) algorithm is used to quantify the agreement between tomography/HUXt output and insitu data. An exhaustive search method is then used to adjust the lower boundary velocity range in order to optimize the model. Early results show a 40% decrease in mean absolute error between measured and modelled velocities compared to that of the coupled MAS/HUXt model. The use of density maps gained from tomography as an inner boundary constraint is thus a valid alternative to coronal magnetic models, and offers a significant advancement in the field given the availability of routine space-based coronagraph observations.

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Section: Introductionmentioning

confidence: 99%

An inner boundary condition for solar wind models based on coronal density

Bunting¹,

Morgan²

2022

J. Space Weather Space Clim.

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show abstract

“…Traditional space systems have fault protection schemes that enter safe modes, requiring human diagnosis and commanding to restore nominal operation. As a result, 4% of nominal spaceflight operations are blocked by spacecraft safings [44]. Notably, [44] presents a lower bound on blocked operational time, as other anomalies can occur that restrict nominal operations and do not cause safing.…”

Section: Adaptive Fault Protection Enables More Observationsmentioning

confidence: 99%

“…As a result, 4% of nominal spaceflight operations are blocked by spacecraft safings [44]. Notably, [44] presents a lower bound on blocked operational time, as other anomalies can occur that restrict nominal operations and do not cause safing. Figure 3 indicates that on-board planning/execution with on-board health diagnosis may mitigate the impact of about 50% of safings.…”

Section: Adaptive Fault Protection Enables More Observationsmentioning

confidence: 99%

Enabling and Enhancing Astrophysical Observations with Autonomous Systems

Amini,

Chien,

Fesq

et al. 2020

Preprint

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Section: Introductionmentioning

confidence: 99%

An inner boundary condition for solar wind models based on coronal density

Bunting¹,

Morgan²

2022

Preprint

View full text Add to dashboard Cite

Accurate forecasting of the solar wind has grown in importance as society becomes increasingly dependent on technology that is susceptible to space weather events. This work describes an inner boundary condition for ambient solar wind models based on tomography maps of the coronal plasma density gained from coronagraph observations, providing a novel alternative to magnetic extrapolations. The tomographical density maps provide a direct constraint of the coronal structure at heliocentric distances of 4 to 8R , thus avoiding the need to model the complex non-radial lower corona. An empirical inverse relationship converts densities to solar wind velocities which are used as an inner boundary condition by the Heliospheric Upwind Extrapolation (HUXt) model to give ambient solar wind velocity at Earth. The dynamic time warping (DTW) algorithm is used to quantify the agreement between tomography/HUXt output and in situ data. An exhaustive search method is then used to adjust the lower boundary velocity range in order to optimize the model. Early results show up to a 32% decrease in mean absolute error between the modelled and observed solar wind velocities compared to that of the coupled MAS/HUXt model. The use of density maps gained from tomography as an inner boundary constraint is thus a valid alternative to coronal magnetic models, and offers a significant advancement in the field given the availability of routine space-based coronagraph observations.

show abstract

Modeling spacecraft safe mode events

Cited by 20 publications

References 5 publications

An inner boundary condition for solar wind models based on coronal density

An inner boundary condition for solar wind models based on coronal density

Enabling and Enhancing Astrophysical Observations with Autonomous Systems

An inner boundary condition for solar wind models based on coronal density

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