Planetary Seismology: Nearly 3 years on Mars, and a return to the Moon
No abstract provided
Yana, Charles↗
Engineering topics
Charalambous, C.
Publications and source records attributed to Charalambous, C..
Seasonal Variations of Seismic Activity on Mars?
We analyze the sequence of seismic events of different types as recorded by the SEIS instrument of the InSight mission. After several weeks without any detection, event counts started to increase at the end of May 2019. The majority of recorded events belongs to the class of 2.4 Hz events, which prominently excite a continuously observed natural resonance frequency. Comparison with expected event counts from a constant-rate Poisson process shows a repeated, step wise increase of the event rate with time. At the same time, event amplitudes, and hence magnitudes, are found to increase as well.
Knapmeyer, M.↗
Fuel-optimal trajectories for aeroassisted coplanar orbital transfer problem
The optimal-control problem arising in coplanar orbital transfer using aeroassist technology is addressed. The maneuver involves the transfer from high earth orbit to low earth orbit with minimum fuel consumption. Simulations are carried out to obtain a corridor of entry conditions which are suitable for flying the spacecraft through the atmosphere. A highlight of the present work is the application of an efficient multiple shooting method for handling the difficult nonlinear two-point boundary value problem resulting from the optimization procedure.
Naidu, D. S.↗