Visibility Of Meteor Showers In Largescale Activity Curves

Figure 1 shows the activity profiles for all meteors detected by amor over four years of operation. Detections during night-time (1800-0600 NZST) and day-time (06001800 NZST) are shown separately; the expected activity times of the three strongest showers observed by amor are highlighted. Note the lack of visible shower activity in these realms, apart from the tentative increase in the night-time profiles over the period of the Southern 8 Aquarids (the strongest shower in the amor data set).

Figure 1 shows the activity profiles for all meteors detected by amor over four years of operation. Detections during night-time (1800-0600 NZST) and day-time (06001800 NZST) are shown separately; the expected activity times of the three strongest showers observed by amor are highlighted. Note the lack of visible shower activity in these realms, apart from the tentative increase in the night-time profiles over the period of the Southern 8 Aquarids (the strongest shower in the amor data set).

Figure 1. Daily meteor activity over four years of amor operation. Night-time profiles are shown on the left and day-time on the right. Years stretch between vernal equinoxes with mean solar longitude as a time unit. The three strongest shower periods are marked for the r] Aquarids (ETA), Southern S Aquarids (SDA) and the Daytime Sextantids (DSX) respectively.

The time periods selected in Figure 1 are expected to distinguish the antihelion and helion source activities with the retrograde apex region meteors being split evenly between the two regimes. Selecting the prograde and retrograde meteors separately is found to slightly improve the relative strength in the Southern 5 Aquarids period, but with no noticeable effect in the other two shower periods.

It is clearly that even the major showers are a second order effect on the sporadic background. A method of probing this background more deeply is therefore desirable in order to enhance the underlying shower structure for detection.

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