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@prefix dct: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix ns1: <https://w3id.org/citedcat-ap/> .
@prefix org: <http://www.w3.org/ns/org#> .
@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

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    dct:description """The four **T**rapped **R**adiation **EN**vironment model **D**evelopment studies were initiated and funded by ESA under ESTEC contracts between 1988 and 2000. The participating institutes were:\r
\r
- Matra Marconi Space (TREND-1)\r
- Space Technology Ireland (TREND-1)\r
- Belgian Institute for Space Aeronomy (TREND-1, 2, 3, 4)\r
- Mullard Space Science Laboratory (TREND-2, 3)\r
- Max Planck Institut für Aeronomie (TREND-3)\r
- Département d'Études et de Recherches en Technologie Spatiale (TREND-4)\r
- Paul Scherrer Institute (TREND-4)\r
\r
ESA Technical Manager: Eamonn Daly\r
\r
## TREND-1: Development Study of Improved Models of the Earth's Radiation Environment\r
\r
Initial study made under ESA/Contract No. 9011/88/NL/MAC with as objectives\r
\r
- to evaluate existing models of the Earth's radiation environment;\r
- to identify their limitations, and to outline requirements for future generation of environmental models;\r
- to identify the relevant particle measurements which are available to improve existing Earth's radiation environment models;\r
- to analyse some of these data and contribute a new step to long-term modelling efforts which started at NSSDC/WDC-A-R&S in the 60's;\r
- to make recommendation for future flight measurements and monitoring of the Earth's radiation environment.\r
\r
## TREND-2: Trapped Radiation Environment Model Development\r
\r
Study made under ESA/Contract No. 9828/92/NL/FM covering\r
\r
- the comparison of the Soviet radiation environment models with NASA’s AP-8 and AE-8 models;\r
- the extension of ESA radiation modeling tools with improved magnetic-field models, new models, and corrections for South Atlantic Anomaly motion;\r
- the investigation of alternative coordinate system to model low-altitude trapped proton environment using atmospheric-density averaging methods;\r
- the analyse of several electron and proton measurement datasets;\r
- the improvement of radiation electron belt models.\r
\r
## TREND-3: Radiation Environments of Astronomy Missions and LEO Missions\r
\r
Study made under ESA/Contracts No. 10725/94/NL/JG(SC) and No. 11711/95/NL/JG(SC) where\r
\r
- new radiation belt models (based on AZUR/EI-88, SAMPEX/PET, UARS/PEM, CRRES/MEA, and ISEE/WIM) have been developed, intercompared when applicable, and compared to the standard NASA models AP-8 or AE-8;\r
- a comprehensive Fortran subroutine library (UNILIB) for calculating magnetic coordinates and adiabatic invariants, performing coordinate transformations, field line and drift shell tracing, and computing averages of atmospheric and ionospheric density over drift shells has been developed;\r
- the anisotropy of the low-altitude trapped proton flux has been extensively studied.\r
\r
## TREND-4: Time-Dependent Radiation-Belt Space Weather Modelling\r
\r
Study made under ESA/Contract No. 11711/95/NL/JG addressing two specific aspects:\r
\r
- the storm-time behaviour of trapped electrons in the outer part of the radiation belts;\r
- the anisotropy and variability on different time scales of the trapped protons at the inner edge of the radiation belts.\r
"""@en ;
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    foaf:page "TREND-1 Final Report: https://orfeo.belnet.be/handle/internal/6605",
        "TREND-2 Final Report: https://doi.org/10.18758/A_393",
        "TREND-2 Technical Note 10: D.J. Rodgers (November 1994) *Outer Radiation Belt Model Development*",
        "TREND-2 Technical Note 1: https://orfeo.belnet.be/handle/internal/6596",
        "TREND-2 Technical Note 2: https://orfeo.belnet.be/handle/internal/6595",
        "TREND-2 Technical Note 3: https://orfeo.belnet.be/handle/internal/11230",
        "TREND-2 Technical Note 4 & 5: https://orfeo.belnet.be/handle/internal/11228",
        "TREND-2 Technical Note 6 & 7: S. Szita, D.J. Rodgers, A.D. Johnstone (June 1993) *Statistical Survey of SEM-2 Data and Probability of Occurrence vs Flux Model*",
        "TREND-2 Technical Note 8: D.J. Rodgers, S. Szita, A.D. Johnstone (June 1993) *Statistical Survey of SEM-2 Data and Probability of Occurrence vs Flux Model*",
        "TREND-2 Technical Note 9: D.J. Rodgers, A.D. Johnstone (November 1994) *Survey of CRRES data*",
        "TREND-2 Technical Note A: https://orfeo.belnet.be/handle/internal/6599",
        "TREND-2 Technical Note B: D.J. Rodgers (November 1994) *Analysis of GOES Electron Data*",
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        "TREND-3 Technical Note 10: https://orfeo.belnet.be/handle/internal/6593",
        "TREND-3 Technical Note 1: E. Keppler, R. Friedel, G. Loidl (June 1997) *Analysis of ISEE Data*",
        "TREND-3 Technical Note 2: D. Rodgers, S. Szita (unknown) *Improved MEA-3 MSSL model*",
        "TREND-3 Technical Note 3: A.D. Johnstone, S. Szita, G. Loidl unknown) *Model unification MEA3-ISEE*",
        "TREND-3 Technical Note 5: https://orfeo.belnet.be/handle/internal/6592",
        "TREND-3 Technical Note 6 part II: https://orfeo.belnet.be/handle/internal/6591",
        "TREND-3 Technical Note 6: https://orfeo.belnet.be/handle/internal/6590",
        "TREND-3 Technical Note 8: D. Rodgers (unknown) *Radiation loss injection study*",
        "TREND-3 Technical Note 9: D. Rodgers, S. Szita (unknown) *METEOSAT-3 analysis: corrections & new DB*",
        "TREND-3 User Manual: https://orfeo.belnet.be/handle/internal/6594",
        "TREND-4 Technical Note 1A: https://orfeo.belnet.be/handle/internal/6600",
        "TREND-4 Technical Note 1C: D. Bosher (June 1998) *Physical completeness of the Salammbô codes 3D and 4D*",
        "TREND-4 Technical Note 1D: D. Bosher (January 2000) *Study of the effects and time scales of the driving parameters",
        "TREND-4 Technical Note 1E/1F: https://orfeo.belnet.be/handle/internal/6601",
        "TREND-4 Technical Note 2A: https://orfeo.belnet.be/handle/internal/6602",
        "TREND-4 Technical Note 2C/2D: https://orfeo.belnet.be/handle/internal/6603",
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