Interplanetary gas. XXVII - A catalog of disconnection events in cometary plasma tails

Heliospheric Latitude Variations of Properties of Cometary Plasma Tails: A Test of the Ulysses Comet Watch Paradigm

“…While the tail orientations shown in Fig. 7 nicely fit the paradigm, we note that Niedner (1981) lists DEs in Comet Brooks on September 16.3 (at latitude 36…”

“…Belton and Brandt (1966) gave comet-tail orientations (position angles) and descriptive data for comets observed from 1889 to 1963. Niedner (1981) presented data for 72 DEs observed from 1892 to 1976. When these sources are combined with the data for DEs in Halley's comet (Brandt et al 1999) and the Ulyssesera comets, the data set is extensive.…”

“…3. Figure 6 shows a plot of DE latitude versus solar-cycle phase for 100 DEs. The DEs consist of 72 from Niedner's (1981) catalog, 19 from Comet Halley (Brandt et al 1999), 4 from the UCW comets (2 probables from Comet de Vico and one each from comets Hyakutake and Hale-Bopp), and 5 additional from the literature. The latter are one possible DE in Comet Bradfield (1979X) (Schulz et al 1994), one DE in Comet Bradfield (1987s) (Cremonese and Fulle 1988), two possible DEs in Comet Austin (1990V) (Farnham and Meech 1994), and one DE in Comet Levy (1990c) (Kosuka et al 1991).…”

“…• outside the hatched area near P = 0.98 are Comet West (1975n) in March of 1976 (Niedner 1981; see Plate 1). Niedner (1982) noted that 2 of the 3 DEs in Comet West ".…”

Disconnection Events (DEs) in Halley's Comet 1985–1986:

“…These are found by fitting a kinematical expression for the recession speed that includes an initial speed and a constant acceleration (Niedner 1981). Specific examples for Halley's comet in 1985-1986 are found in Niedner et al (1991) and Yi et al (1993Yi et al ( , 1994a.…”