Solar particle events seen by the MOPITT instrument

Nichitiu, F.; Drummond, J. R.; Zou, J.; Deschambault, R.

doi:10.1016/j.jastp.2004.06.002

Cited by 15 publications

(15 citation statements)

References 12 publications

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“…In addition, we reject data in the vicinity of the South Atlantic anomaly (SAA), a region characterized by strong radiation and a weak geomagnetic field strength. We use the location of the SAA (latitude=−26.1 • , width=16.7 • , longitude=−47.4 • , width=28.4 • ) as derived in Nichitiu et al (2004), and we exclude those data for which the distance from the SAA location defined as d= exp(−(…”

Section: Data Selection For the Inversionmentioning

confidence: 99%

Global emissions of non-methane hydrocarbons deduced from SCIAMACHY formaldehyde columns through 2003–2006

et al. 2009

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Abstract. Formaldehyde columns retrieved from the Scanning Imaging Absorption Spectrometer for Atmospheric Chartography/Chemistry (SCIAMACHY) instrument onboard ENVISAT satellite through 2003 to 2006 are used as top-down constraints to derive updated global biogenic and biomass burning flux estimates for the non-methane volatile organic compounds (NMVOCs) precursors of formaldehyde. Our interest is centered over regions experiencing strong emissions, and hence exhibiting a high signal-to-noise ratio and lower measurement uncertainties. The formaldehyde dataset used in this study has been recently made available to the community and complements the long record of formaldehyde measurements from the Global Ozone Monitoring Experiment (GOME). We use the IMAGESv2 global chemistry-transport model driven by the Global Fire Emissions Database (GFED) version 1 or 2 for biomass burning, and from the newly developed MEGAN-ECMWF isoprene emission database. The adjoint of the model is implemented in a grid-based framework within which emission fluxes are derived at the model resolution, together with a differentiation of the sources in a grid cell. Two inversion studies are conducted using either the GFEDv1 or GFEDv2 as a priori for the pyrogenic fluxes. Although on the global scale the inferred emissions from the two categories exhibit only weak deviations from the corresponding a priori estimates, the regional updates often present large departures from their a priori values. The posterior isoprene emissions over North America, amounting to about 34 Tg C/yr, are estimated to be Correspondence to: T. Stavrakou (jenny@aeronomie.be) on average by 25% lower than the a priori over [2003][2004][2005][2006], whereas a strong increase (55%) is deduced over the south African continent, the optimized emission being estimated at 57 Tg C/yr. Over Indonesia the biogenic emissions appear to be overestimated by 20-30%, whereas over Indochina and the Amazon basin during the wet season the a priori inventory captures both the seasonality and the magnitude of the observed columns. Although neither biomass burning inventory seems to be consistent with the data over all regions, pyrogenic estimates inferred from the two inversions are reasonably similar, despite their a priori deviations. A number of sensitivity experiments are conducted in order to assess the impact of uncertainties related to the inversion setup and the chemical mechanism. Whereas changes in the background error covariance matrix have only a limited impact on the posterior fluxes, the use of an alternative isoprene mechanism characterized by lower HCHO yields (the GEOS-Chem mechanism) increases the posterior isoprene source estimate by 11% over northern America, and by up to 40% in tropical regions.

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Section: Data Selection For the Inversionmentioning

confidence: 99%

Global emissions of non-methane hydrocarbons deduced from SCIAMACHY formaldehyde columns through 2003–2006

et al. 2009

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“…This effect is called the day-night asymmetry. (c) The day-night asymmetry in the particle intensity was observed initially by satellite experiments such as the MOP-PIT space instrument [14] in the MeV energy region. The effect was also observed by experiments on balloons, where an enhancement in the atmospheric pre-reversal electric field in the SAA region has been observed [2].…”

Section: Conclusion and Remarksmentioning

confidence: 93%

Simultaneous observation at sea level and at 5200 m.a.s.l. of high energy particles in the South Atlantic Anomaly

Augusto

Navia

Tsui

et al. 2010

Astroparticle Physics

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“…Analysis of the accelerometer signals shows a direct correlation of the DSE daily rate with solar activity, a day/night asymmetry likely caused by interaction of trapped particles with the neutral atmosphere, and a direct correlation with high-intensity solar proton events (SPE). The events are localized mainly in the South Atlantic Anomaly region, but the polar regions, particularly the southern pole, are also regions of higher risk mainly during intense SPEs [7].…”

Section: -80k Cooler Pair -Mopitt On Nasa Terra Platformmentioning

confidence: 99%

Heritage Overview: 20 Years of Commercial Production of Cryocoolers for Space

Gibson¹,

Reed²,

Bradshaw³

et al. 2008

AIP Conference Proceedings

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The paper presents an overview of the results of industrialization of the ISAMS Stirling cooler technology, achieved through cooperation with the Rutherford Appleton Laboratory. Seven batches of coolers have been produced and delivered to international customers for various space applications. A summary of in-orbit flight heritage is presented showing flight telemetry data for detector and mounting interface temperatures, vibration and other drive parameters. Thirteen of the 50-80K cooler models have been launched, with many of the coolers having already exceeded their required lifetimes. Highlights of cooler commissioning and performance in orbit are presented, with discussion of lessons learned, focusing on the last three production batches of the 50-80K Stirling cooler.

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Solar particle events seen by the MOPITT instrument

Cited by 15 publications

References 12 publications

Global emissions of non-methane hydrocarbons deduced from SCIAMACHY formaldehyde columns through 2003–2006

Global emissions of non-methane hydrocarbons deduced from SCIAMACHY formaldehyde columns through 2003–2006

Simultaneous observation at sea level and at 5200 m.a.s.l. of high energy particles in the South Atlantic Anomaly

Heritage Overview: 20 Years of Commercial Production of Cryocoolers for Space

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