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Danish Space Research Institute Danish Small Satellite Programme FH 2002-06-11Space_Environment.ppt Slide # 1 Flemming Hansen MScEE, PhD Technology Manager.

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Presentation on theme: "Danish Space Research Institute Danish Small Satellite Programme FH 2002-06-11Space_Environment.ppt Slide # 1 Flemming Hansen MScEE, PhD Technology Manager."— Presentation transcript:

1 Danish Space Research Institute Danish Small Satellite Programme FH 2002-06-11Space_Environment.ppt Slide # 1 Flemming Hansen MScEE, PhD Technology Manager Danish Small Satellite Programme Danish Space Research Institute Phone: 3532 5712 Mobile: 2177 5712 E-mail: fh@dsri.dk Satellite Technology Course Space Environment Downloads available from: http://www.dsri.dk/roemer/pub/sat_tech RØMER 3D Model by Jan Erik Rasmussen, DSRI

2 Danish Space Research Institute Danish Small Satellite Programme FH 2002-06-11Space_Environment.ppt Slide # 2 Overview of the Space Environment External Factors Residual atmosphere (up to  800 km) - Drag causes orbit decay and reentry Trapped protons - Degrades materials and electronic components, causes single-event effects in semiconductor components. Trapped electrons - Degrades materials and electronic components Solar protons from flares - Degrades materials and electronic components, causes single-event effects in semiconductor components. Cosmic rays - causes single-event effects in semiconductor components. Solar radiation: IR, Visible, UV, X-Ray - Degrades materials Plasma from magnetic substorms - Causes spacecraft charging Atomic oxygen - Erodes exposed surfaces Local Factors Outgassing - Deposits on cold surfaces, e.g. optical apertures.

3 Danish Space Research Institute Danish Small Satellite Programme FH 2002-06-11Space_Environment.ppt Slide # 3 Earth’s Radiation Belts Trapped ProtonsTrapped Electrons

4 Danish Space Research Institute Danish Small Satellite Programme FH 2002-06-11Space_Environment.ppt Slide # 4 Effects of High-Energy Charged Particles in the Space Environment  Biological effects (Prolonged exposure of astronauts in MIR and International Space Station)  Shielding, return to ground in case of majorsolar flares  Degradation of materials and semiconductors by ionization and lattice displacements  Materials selection, radiation hardening, shielding  Single-Event Upsets in computer memory cells  Error Detection and Correction (EDAC), radiation hardening  Radiation background (Increased noise level in CCD, X-ray and gamma-ray detectors)  Radiation hardening, shielding, select orbit outside or inside radiation belts, disable payload while passing through radiation belts

5 Danish Space Research Institute Danish Small Satellite Programme FH 2002-06-11Space_Environment.ppt Slide # 5 Calculation of Effects of Ionizing Radiation in the Space Environment ESA has created a web-facility - SPENVIS that gives the user acess to a number of useful modeling and calculation resources – see SPENVIS opening vindow at right You have to be a registered user to gain access to the facility. http://www.spenvis.oma.be/spenvis/

6 Danish Space Research Institute Danish Small Satellite Programme FH 2002-06-11Space_Environment.ppt Slide # 6 Radiation in Syn-Synchronous Polar Low Earth Orbit

7 Danish Space Research Institute Danish Small Satellite Programme FH 2002-06-11Space_Environment.ppt Slide # 7 Radiation in Molniya Orbit (RØMER)

8 Danish Space Research Institute Danish Small Satellite Programme FH 2002-06-11Space_Environment.ppt Slide # 8 Radiation Environment in Molniya Orbit - Trapped Proton Fluxes Along Orbit

9 Danish Space Research Institute Danish Small Satellite Programme FH 2002-06-11Space_Environment.ppt Slide # 9 Radiation Environment in Molniya Orbit - Trapped Electron Fluxes Along Orbit

10 Danish Space Research Institute Danish Small Satellite Programme FH 2002-06-11Space_Environment.ppt Slide # 10 Radiation Environment in Geostationary Transfer Orbit, 28.5° Inclination

11 Danish Space Research Institute Danish Small Satellite Programme FH 2002-06-11Space_Environment.ppt Slide # 11 Radiation Environment in Molniya Orbit - Trapped Proton Fluxes Along Orbit

12 Danish Space Research Institute Danish Small Satellite Programme FH 2002-06-11Space_Environment.ppt Slide # 12 ØRSTED Magnetic Field Model Today’s Field Changes Since 1980 South-Atlantic Anomaly (SAA)

13 Danish Space Research Institute Danish Small Satellite Programme FH 2002-06-11Space_Environment.ppt Slide # 13 Effects of South-Atlantic Anomaly - 1 Ørsted Single-Event Upsets

14 Danish Space Research Institute Danish Small Satellite Programme FH 2002-06-11Space_Environment.ppt Slide # 14 Effects of South-Atlantic Anomaly - 2 UoSAT-3 Single-Event Upsets

15 Danish Space Research Institute Danish Small Satellite Programme FH 2002-06-11Space_Environment.ppt Slide # 15 Radiation Dose Tolerance of Materials

16 Danish Space Research Institute Danish Small Satellite Programme FH 2002-06-11Space_Environment.ppt Slide # 16 Solar Flares Protons above 10 MeV Probability of exceeding a given fluence level for various mission durations Major Solar Flare

17 Danish Space Research Institute Danish Small Satellite Programme FH 2002-06-11Space_Environment.ppt Slide # 17 Cosmic Rays Cosmic ray species vs particle energy Effect of high-energy charged particle in integrated circuit

18 Danish Space Research Institute Danish Small Satellite Programme FH 2002-06-11Space_Environment.ppt Slide # 18 Single-Event Latch-Up Two-transistor model for latch-up in CMOS device showing parasitic elements Latch-up protection circuit for ADSP-2100 digital signal processor

19 Danish Space Research Institute Danish Small Satellite Programme FH 2002-06-11Space_Environment.ppt Slide # 19 Typical Radiation Tolerences of Rad Hard and COTS Parts COTS: Commercial Off-the-Shelf (parts)

20 Danish Space Research Institute Danish Small Satellite Programme FH 2002-06-11Space_Environment.ppt Slide # 20 Linear Energy Transfer (LET) Spectra in Orbit

21 Danish Space Research Institute Danish Small Satellite Programme FH 2002-06-11Space_Environment.ppt Slide # 21 Single-Event Upset - Linear Energy Transfer Threshold Radiation Hard Radiation Soft

22 Danish Space Research Institute Danish Small Satellite Programme FH 2002-06-11Space_Environment.ppt Slide # 22 Single-Event Upset Protection Methods

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