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Figure 1: Distribution of ecliptic coordinates of perihelion points of known SOHO sungrazers. For October 2004, the primary Kreutz group has 686 members, the Meyer group 40 and the Marsden & Kracht group together 39. Circles mark the angular distances around respective mean values containing 99% of the members of the three groups. |
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Figure 2: Histograms of perihelion passage times for the SOHO sungrazing groups of comets: upper panel - yearly, lower panel - monthly. The pattern for the monthly rates of the Kreutz group holds for each year within statistical uncertainty. |
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Figure 3: Detection chart for sungrazing comet-related PUI and ENA by Earth-bound spacecraft. The dark region is a projection on sky of the volume penetrated by nuclei of the Kreutz group comets. Its lighter envelope is a projection of the volume filled by their comae. The light gray streaks are sky projections of volumes penetrated by Meyer and Marsden & Kracht comets (with the comae). The black line is a sky projection of the most probable orbit of the Kreutz group. Arrows mark the dates of Earth entering and exiting the region prone for detection of the sungrazing comets populations and the date of the intersection with the projection of the most probable Kreutz orbit. The lower horizontal axis is scaled in ecliptic longitude and the upper axis in the corresponding DOY values; the vertical axis is ecliptic latitude. |
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Figure 4: Detection chart for the sungrazing comet-related PUI by Ulysses. The gray regions are identical as in Fig. 3. The Ulysses trajectory is marked with the dotted line. Ulysses was launched while in the Meyer, Marsden & Kracht region and exited it on January 1, 1991. Then, on its two out-of-ecliptic revolutions around the Sun, it crossed the regions prone to detection of the sungrazer population on the days indicated in the figure. |
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