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Cometary meteoroid trails exist in the vicinity of comets, forming finestructure of the interplanetary dust cloud. The trails consist predominantly ofcometary particles with sizes of approximately 0.1 mm to 1 cm which are ejectedat low speeds and remain very close to the comet orbit for several revolutionsaround the Sun. When re-analysing the Helios dust data measured in the 1970s,Altobelli et al. (2006) recognized a clustering of seven impacts, detected in avery narrow region of space at a true anomaly angle of 135 deg, which theauthors considered as potential cometary trail particles. We re-analyse thesecandidate cometary trail particles to investigate the possibility that some orall of them indeed originate from cometary trails and we constrain their sourcecomets. The Interplanetary Meteoroid Environment for eXploration (IMEX) duststreams in space model is a new universal model for cometary meteoroid streamsin the inner solar system, developed by Soja et al. (2015). Using IMEX we studycometary trail traverses by Helios. During ten revolutions around the Sun, andin the narrow region of space where Helios detected the candidate dustparticles, the spacecraft repeatedly traversed the trails of comets45P/Honda-Mrkos-Pajduvsakova and 72P/Denning-Fujikawa. Based on the detectiontimes and particle impact directions, four detected particles are compatiblewith an origin from these two comets. We find a dust spatial density in thesetrails of about 10^-8 to 10^-7 m^-3. The in-situ detection and analysis ofmeteoroid trail particles which can be traced back to their source bodies byspacecraft-based dust analysers opens a new window to remote compositionalanalysis of comets and asteroids without the necessity to fly a spacecraft toor even land on those celestial bodies. This provides new science opportunitiesfor future missions like Destiny+, Europa Clipper and IMAP.

Helios spacecraft data revisited: Detection of cometary meteoroid trails by in-situ dust impacts