- R. Ernst (University of Aachen), stagiaire from July 2007 (ongoing)
Subject: Analysis of Hipparcos micro-particle impact data
The Hipparcos satellite measured during its
operational lifetime several small attitude changes, which
are assumed to result from hypervelocity micro-particle
impacts. These changes were observed during the Hipparcos attitude reconstruction. Robert will
analyse the Hipparcos catalogue with the
discrete rate changes and compare the results
with our micro-particle flux model predictions.
After this analysis, Robert will use the Hipparcos data to predict
the effects of impacting micro-meteoroids for
the GAIA mission. This analysis could be used in
addition to our (statistical) micro-particle
impact risk analysis.
- A.-L. Salagoity (Ecole
d'ingénieurs MATMECA Bordeaux), stagiaire from February
to July 2007.
Subject: Design of a Martian wind mill
The first aim of this research is to prove
that the Rover of the Martian exploration can work, or at
least can be kept in life, thanks to wind power energy. The
idea is basically to build a windmill on top of the rover’s
roof in addition to the existing solar panels. This windmill
could enable to make run the rover when the solar panels are
not efficient anymore (during Martian dust storm and during
Martian polar night).
The second part of the study is to define,
thanks to propeller and blade theories, the more suitable
design for this Martian windmill (horizontal or vertical
axis, number of blades, blade bank angle, blade radius,
blade chord length…).
Once the Martian design defined, similarity
method will allow us to calculate the dimensions of an
equivalent Earth windmill – a wind mill whose performances
on Earth would be equal to a wind mill on Mars.
From this calculation, an
experimental model of the Earth windmill could be built and
performances tests could be conducted.
Anne-Laure used the results of her stage work for her
Supervisor: J.-P Huot
- W. Kuiper (Delft University of
Technology), stagiaire from January to
Subject: Verification and application of ESABASE2/DEBRIS
impact risk assessment tool
Wim performed two main tasks during his stage:
he validated the newly developed software tool
ESBASE2/DEBRIS. This PC based tool allows the assessment of
the impact risk from meteoroids and space debris objects to
spacecraft in orbit. To verify the proper functioning of
ESABASE2 Wim established a test plan, wrote several small
test programs himself and compared results of ESABASE2 to
those from other existing tools where possible. He
identified several errors in the code which were
Next he used the tool to assess
the impact risk to future ConeXpress missions. ConeXpress is
a planned service spacecraft intended to extend the lifetime
of telecommunication spacecraft in the geostationary orbit.
The tanks of ConeXpress were identified as being most at
risk from hypervelocity impacts. Wim also studied options to
enhance the impact protection and calculated that a second
protective layer spaced several cm from the tank would
greatly reduce the impact risk.
Wim used the results of his stage work for his Master
- R. Lindberg (Lulea University of Technology), YGT from
April 2005 to October 2006
Subject: Investigation of the effect of radiation
transport techniques and tools to space environment
The work consisted of several activities aimed at the
investigation of the uncertainties related to the radiation
transport techniques commonly used at the Agency and in
Industry for the assessment of the radiation effects to
R. Lindberg made a detailed comparisons of Monte Carlo and
Sector Shielding analysis for space applications
- Review of physical interaction models and comparison of
radiation transmission probability after shielding
- Assessment of the radiation transport techniques in
simple and complex geometry models, in lightly and heavily
- Detailed assessment of Total Ionising Dose induced by
the space proton and electron environment for a realistic
geometry and orbit model, with the ConeXpress mission chosen
The results of Ronnie's analyses were published on the
refereed journal IEEE Transactions in Nuclear
- Felix van der Sommen (University Utrecht), stagiaire
from January 2004 to July 2004.
Subject: Orbital Evolution of Objects in GEO
Felix studied numerically the orbital evolution of
uncontrolled objects in the geostationary orbit.
modified and applied an existing tool which was originally
developed by ESOC. For his analysis he considered all
important perturbing forces: the non-spherical shape of the
Earth, the effects from the gravity of the sun and moon and
the solar radiation pressure. He studied the long term
evolution of objects of different sizes. The area to mass
ratio was identified as main parameter which leads to a
spread of objects which originate from the same source.
Felix also studied the most likely impact velocities and
angles of these drifting objects to spacecraft in GEO. His
calculations were in perfect agreement with recent optical
measurements of drifting objects in GEO.
Felix used the results of his stage work for his Master
- R. Lindberg (Lulea University of Technology), stagiaire
from September 2003 to April 2004
In this work, a model for finding the location of
INTEGRAL spacecraft entry into the trapped radiation belts
as well as the exit from them was developed using data from
the INTEGRAL Radiation Monitor (IREM) instrument. This was
done to see if the available science time could be increased
by observing possible seasonal variations of the radiation
belts as seen by INTEGRAL. Emphasis was on detecting entry
in or exit from the outer, electron dominated radiation belt
by looking at the count rate of electrons with energy
greater than 0.5 MeV.
Furthermore, an algorithm was developed to predict the
space environment for INTEGRAL in the radiation belts using
data from the SREM instrument on the PROBA-1 satellite. The
algorithm uses the calculated flux for the two satellites to
scale the measured count rate onboard PROBA-1 to a predicted
count rate for INTEGRAL.
Results from the radiation belt entry and exit model
showed a variation over the 13-month period analysed
(November 2002 to December 2003). A seasonal variation was
detected for the exit points, but similar results for the
entry points were difficult to resolve. This was due to
INTEGRAL's orbit in which the satellite enters the outer
belt in a region where the belt is highly dynamic and
variable. The analysis also considered the L-shell,
altitude, time from perigee, and local time of the entry
and exit points.
The results of Ronnie's analyses were used in his Master
in Science degree.
- L. Rosenqvist (YGT from Uppsala Tekniska
Högskola) from July 2002 to September 2003.
Subj: Solar proton environment modelling for space
The work consisted on various activities related to
statistical modelling of MeV solar proton fluence for space
mission radiation effects assessments. She performed 3 main
- review of a solar proton fluence database
developed by University of Barcelona of which she found
various weaknesses and proposed significant
- development of heuristic models to
investigate the influence of the dynamics of the solar
proton source in the integrated fluence and especially its
heliocentric distance gradient.
- assessment of data
processing and quality on the output of solar proton fluence
models and development of a procedure for generating model
- E. Sasot (Stagiaire from GMM-INSA, Toulouse,
France) from June 2001 to August 2001.
Subj: Assessment of solar particle events models
The project has included a review of 3 statistical models
of Solar Particle Events developed at JPL, NRL and MSU
respectively. It was shown that major limitations of these
models include the lack of information on the data used to
fit the model parameters and on the uncertainty of the model
prediction. The work was completed by the study of a method
to assess model parameters and their uncertainties based on
a Bayesian analysis. It was essentially applied to the JPL
- S. Guegan (Stagiaire Ecole MATMECA,
Bordeaux, France) from June 2000 to September 2000.
Subj: Preparation of the infrastructure of the Spacecraft
Plasma Interaction Network in Europe (SPINE).
The training consisted on several items related to the
development of SPINE infrastructure. It included: the
development of the web site for SPINE, the improvement of
the Freja charging database interface, the preliminary work
required for the preparation of a proposal for an European
training network and a review of the potential of the code
PicUp3D as a community simulation tool.
- P. Beltrami (Stagiaire Technical University
Braunschweig) from February 2000 to July 2000.
Subj: He performed a very detailed and elaborate
meteoroid and space debris impact risk analyses for the
Automated Transfer Vehicle (ATV, a resource module for the
International Space Station). Using the ESABASE/DEBRIS
impact risk assessment tool he studied different options for
shielding enhancements of various ATV subsystems and the
related mass penalties. He also developed an improved
ESABASE model of the Crew Rescue Vehicle (CRV) which can be
used for future impact studies
- J. Idestrom (Stagiaire from University of
Oldenburg) from February 2000 to April 2000.
Subj: He developed and applied a software tool which
calculates the angle between the viewing direction of the
GORID impact detector in the geostationary orbit and any
fixed user specified direction (e.g. the direction of the
sun or of a given meteoroid stream).
- L. Rosenqvist (Stagiaire from Uppsala Tekniska
Högskola) from June 1999 to August 1999.
Subj: A model of the annual and diurnal variation of the
XMM plasma sheet crossing duration was developed. This model
improved the long term prediction of the occurrence of
background induced in the XMM detectors.
- V. Jaffrézic (Stagiaire from GMM-INSA, Toulouse,
France) from June 1999 to September 1999.
Subj: Long Term prediction of solar proton fluence:
scaling based model and comparision with JPL-91.
An investigation of the applicability of the
multi-fractal analysis on solar proton fluence time series
has been performed.
- J.-P. Braeunig (Stagiaire) from February
1999 to June 1999.
Subj: Study of the influence of chlorophyll on the
diurnal and annual cycles of the ocean, using a coupled
mixed-layer and thermocline model.
- T. Bieler (Stagiaire from University of Aachen)
from November 1998 to April 1999.
Subj: Modelling of impacts from meteoroid
of Impacts from Meteoroid Streams
- N. Crosby (Research Fellow) from April
1998 to August 1999.
Subj: Space weather activities; solar particle event
models and predictions.
- J. Forest (Stagiaire from Univ. Versailles St
Quentin, DEA Modèles Mathématiques, Simulation et
Applications de la Physique)
from March 1998 to July
Subj: Numerical modelling of magnetic interactions on
Langmuir probe current in space plasma.
- L. Wedin (Stagiaire from
Högskola) from June 1998 to December 1998.
Subj: Study and simulation of spacecraft charging in
- D. Grystad (Stagiaire from the Space Engineering Program
of Umeå University, Kiruna) from April 1997 to July
Subj: Analysis of Meteosat P2 anomaly with the Space
- P. Moreno (Young Graduate Trainee, from
Royal Institute of Technology,
Stockholm) from April 1997 to April 1998.
Subj: Installation and testing of Martian Global
Circulation Models (GCM).
- M. Pankhurst (Stagiaire from
University College London
) from June 1997 to September 1997.
Subj: Extending and updating the TEC-EES webpages.
Evaluation of the web server usage.
- U. Svensson (Stagiaire from the
Space Engineering Program
of Umeå University, Kiruna) from April 1997 to July
Subj: Simulation of Freja charging events using Polar
- S. Tucker (Stagiaire from
University of Bristol,
Engineering) from June 1997 to September 1997.
Subj: Analysis of cosmic dust and space debris data
obtained from geostationary orbit impact detector
- V. Génot
(Stagiaire from Univ. Versailles St Quentin, DEA Modèles
Mathématiques, Simulation et Applications de la
Physique) from March 1996 to July 1996.
Subj: Self consistent methods for the computation of non
monotoneous electrostatic potential around electron-emitting
bodies in space.
- A. Glover (Stagiaire from University College,
London) from June 1996 to September 1996
Subj: Analysis of data from the Radiation Environment
Monitor instrument and Graphical presentation of dose
results for future missions.
- S. Hamzavi (Stagiaire from T.U. Delft, Technical
Informatics) from Feb 1996 to Aug 1996.
Subj: Langmuir probe measurements reduction using a
feed-forward neural network.
- S. Hauptmann (Young Graduate Trainee) from March
1996 to March 1997.
Subj: Implementation, analysis and enhancement of the
1996 release of the NASA space debris environment reference
model, including comparison to existing models and
measurement data from retrieved satellite surfaces.
- A. Zaragoza Gray (Spanish Trainee<) from January
1996 to December 1997.
Subj: (i) Study to include directionality of fluxes of
meteoroid streams into ESABASE/DEBRIS; (ii) Hypervelocity
impact damage analysis for the Columbus Orbital
Facility; (iii) Data processing using IDL and CDF for the
Ulysses Data System; (iv) Radiation analysis using
ESABASE/RADIATION for the SREM.
- J. Bakker (Stagiaire from U. Delft, Dept. Aerospace
Engineering) from March 1995 to December 1995
Subj: Cosmic Radiation Induced Interference in
- F. Camermans (Young Graduate Trainee<) from March
1995 to March 1996.
Subj: (i) Visualisation of REM data taken from the
STRV-1b satellite; (ii) Extraction of X-ray flux data from
the GOES satellite; (iii) Investigation of Meteosat
Time-Tagged Anomalies on the Basis of the GOES satellites'
Electron Flux Data
- F. J. López Honrubia (Spanish Trainee) from Aug.
1995 to Aug. 1996.
Subj.: Non-linear relationship between Meteosat Anomalies
and the high-energy electron environment at geostationary
orbit using a LVQ neural network.
- C.Trenkel (Young Graduate Trainee) from January
1993 to November 1993.
Subj: (i) Comparison of GEANT 3.15 and ITS 3.0
Radiation Transport Codes; (ii) Software Simulation of and
Enhanced Radiation Environment Monitor
- M.Rolfe (Stagiaire from University of Bristol, Dept.
Aeronautics and Astronautics)
Subj: (i) O/O+ Ratios for 6 LEO Missions; (ii) Atomic
Oxygen Study for Eureca Post-Flight Investigation
- P. Nieminen (Stagiaire from U. Helsinki) from
June 1992 to December 1992
Subj: (i) Lithium-drifted silicon detectors on space
radiation measurements: (ii) A study of a compact sensor
for space radiation monitoring
- R. Danner (Stagiaire from Max-Plank-Institut for
Extraterresrial Physics) from February 1992 to August
Subj: Charged-Particle Induced Background Expected on
XMM, based on analysis of ISEE particle data and
GEANT Monte-Carlo simulation.