Open AccessThe activity of the 2004 Geminid meteor shower from global visual observations
Author(s) -
Arlt R.,
Rendtel J.
Publication year - 2006
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2006.10077.x
Subject(s) - meteoroid , meteor shower , physics , meteor (satellite) , maxima , astrophysics , magnitude (astronomy) , astronomy , art , performance art , art history
A comprehensive set of 612 h of visual meteor observations with a total of 29 077 Geminid meteors detected was analysed. The shower activity is measured in terms of the Zenithal Hourly Rate (ZHR). Two peaks are found at solar longitudes and with ZHR = 126 ± 4 and ZHR = 134 ± 4 , respectively. The physical quantities of the Geminid meteoroid stream are the mass index and the spatial number density of particles. We find a mass index of s ≈ 1.7 and two peaks of spatial number density 234 ± 36 and 220 ± 31 particles causing meteors of magnitude +6.5 and brighter in a volume of 10 9 km 3 , for the two corresponding ZHR maxima. There were 0.88 ± 0.08 and 0.98 ± 0.08 particles with masses of 1 g or more in the same volume during the two ZHR peaks. The second of the two maxima was populated by larger particles than the first one. We compare the activity and mass index profiles with recent Geminid stream modelling. The comparison may be useful to calibrate the numerical models.