Joint two-point observations of LF-waves at 67P/Churyumov—Gerasimenko
Glassmeier, K. -H.; Richter, I.; Fornacon, K. -H.; Cupido, E.; Heinisch, Philip; Auster, H. -U.; Haerendel, G.; Apathy, I.
Germany, Hungary, United Kingdom
Abstract
After the Rosetta mission reached its target comet 67P/Churyumov-Gerasimenko, the lander Philae touched down on the surface on 2014 November 12. During the First-Science-Sequence after touchdown the lander magnetometer ROMAP and the orbiter magnetometer RPC-MAG were both operating simultaneously which allowed for in situ magnetic two-point observations of the comet. This analysis aims at determining the characteristics of the low-frequency plasma waves present in the nucleus surface region, including frequency, propagation direction and velocity. These waves propagate predominantly from the nucleus towards the Sun with a mean phase velocity of ∼5.3 km s-1, a wavelength of ∼660 km and an average frequency of ∼8 mHz.