A background correction algorithm for Van Allen Probes MagEIS electron flux measurements

Claudepierre, S. G.; O’Brien, T. P.; Blake, J. B.; Fennell, J. F.; Roeder, J. L.; Clemmons, J. H.; Looper, M. D.; Mazur, J. E.; Mulligan, T.; Spence, H. E.; Reeves, G. D.; Friedel, R. H. W.; Henderson, M. G.; Larsen, B.

doi:10.1002/2015ja021171

Cited by 85 publications

(130 citation statements)

References 30 publications

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“…The largest outlier seen in CXD channels 1 and 2 has been investigated. For this work we have used the background‐corrected MagEIS fluxes [see Claudepierre et al , ] and where no background correction is available the flux is set to a fill value; we note that this primarily affects the lower energy channels on RBSP‐A. In this case our processing sets the missing MagEIS flux values to zero and thus the expected count rate is underestimated in the channels most sensitive to lower energy electrons.…”

Section: Resultsmentioning

confidence: 99%

The Global Positioning System constellation as a space weather monitor: Comparison of electron measurements with Van Allen Probes data

et al. 2016

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Energetic electron observations in Earth's radiation belts are typically sparse, and multipoint studies often rely on serendipitous conjunctions. This paper establishes the scientific utility of the Combined X-ray Dosimeter (CXD), currently flown on 19 satellites in the Global Positioning System (GPS) constellation, by cross-calibrating energetic electron measurements against data from the Van Allen Probes. By breaking our cross calibration into two parts-one that removes any spectral assumptions from the CXD flux calculation and one that compares the energy spectra-we first validate the modeled instrument response functions, then the calculated electron fluxes. Unlike previous forward modeling of energetic electron spectra, we use a combination of four distributions that together capture a wide range of observed spectral shapes. Our two-step approach allowed us to identify, and correct for, small systematic offsets between block IIR and IIF satellites. Using the Magnetic Electron Ion Spectrometer and Relativistic Electron-Proton Telescope on Van Allen Probes as a "gold standard," we demonstrate that the CXD instruments are well understood. A robust statistical analysis shows that CXD and Van Allen Probes fluxes are similar and the measured fluxes from CXD are typically within a factor of 2 of Van Allen Probes at energies ≲4 MeV. We present data from 17 CXD-equipped GPS satellites covering the 2015 "St. Patrick's Day" geomagnetic storm to illustrate the scientific applications of such a high data density satellite constellation and therefore demonstrate that the GPS constellation is positioned to enable new insights in inner magnetospheric physics and space weather forecasting.

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Section: Resultsmentioning

confidence: 99%

The Global Positioning System constellation as a space weather monitor: Comparison of electron measurements with Van Allen Probes data

et al. 2016

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“…In this paper, we display measurements from only one (VAP‐A) of the two satellites, although measurements from both satellites have been examined indicating similar electron characteristics. The background correction [ Claudepierre et al ., ] was applied to data shown in Figure . We note that the differences in the flux level between the corrected (Figure ) and uncorrected data (Figure ) are very small in the energy range of interest, and the time variations are the same.…”

Section: Observationsmentioning

confidence: 99%

Formation of the inner electron radiation belt by enhanced large‐scale electric fields

Selesnick

Blake

2016

JGR Space Physics

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A two‐dimensional bounce‐averaged test particle code was developed to examine trapped electron trajectories during geomagnetic storms with the assumption of conservation of the first and second adiabatic invariants. The March 2013 storm was selected as an example because the geomagnetic activity Kp index sharply increased from 2 + to 7− at 6:00 UT on 17 March. Electron measurements with energies between 37 and 460 keV from the Magnetic Electron Ion Spectrometer (MagEIS) instrument onboard Van Allen Probes (VAP) are used as initial conditions prior to the storm onset and served to validate test particle simulations during the storm. Simulation results help to interpret the observed electron injection as nondiffusive radial transport over a short distance in the inner belt and slot region based on various electric field models, although the quantitative comparisons are not precise. We show that electron drift trajectories are sensitive to the selection of electric field models. Moreover, our simulation results suggest that the actual field strength of penetration electric fields during this storm is stronger than any existing electric field model, particularly for L ≤ 2.

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“…6 (VAP A gives almost the same result). We use the MAGEIS data corrected from proton contamination that appeared mainly at L<2 in the inner belt (Claudepierre et al, 2014;Li et al, 2015). The resolution obtained with EPT is higher than with VAP because PROBA-V has a period of 101 min.…”

Section: Characteristics Of the 17 March 2015 Eventmentioning

confidence: 99%

The effects of the big storm events in the first half of 2015 on the radiation belts observed by EPT/PROBA-V

Pierrard

Rosson

2016

Ann. Geophys.

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Abstract. With the energetic particle telescope (EPT) performing with direct electron and proton discrimination on board the ESA satellite PROBA-V, we analyze the highresolution measurements of the charged particle radiation environment at an altitude of 820 km for the year 2015. On 17 March 2015, a big geomagnetic storm event injected unusual fluxes up to low radial distances in the radiation belts. EPT electron measurements show a deep dropout at L>4 starting during the main phase of the storm, associated to the penetration of high energy fluxes at L<2 completely filling the slot region. After 10 days, the formation of a new slot around L = 2.8 for electrons of 500-600 keV separates the outer belt from the belt extending at other longitudes than the South Atlantic Anomaly. Two other major events appeared in January and June 2015, again with injections of electrons in the inner belt, contrary to what was observed in 2013 and 2014. These observations open many perspectives to better understand the source and loss mechanisms, and particularly concerning the formation of three belts.

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A background correction algorithm for Van Allen Probes MagEIS electron flux measurements

Cited by 85 publications

References 30 publications

The Global Positioning System constellation as a space weather monitor: Comparison of electron measurements with Van Allen Probes data

The Global Positioning System constellation as a space weather monitor: Comparison of electron measurements with Van Allen Probes data

Formation of the inner electron radiation belt by enhanced large‐scale electric fields

The effects of the big storm events in the first half of 2015 on the radiation belts observed by EPT/PROBA-V

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