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Daniels, Lori R.; McGuire, Terry

doi:10.1023/a:1022154917650

Cited by 10 publications

(3 citation statements)

References 38 publications

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“…As stated above, the α = 1 case corresponds to equal numbers of grains per mass bin, while α = 2 corresponds to equal total mass per mass bin. The α = 1.65 case corresponds to the mass distribution index derived by Daniels & Hughes (1981a) when accretion proceeds with a constant reservoir of low-mass grains. The α = 1.73 case corresponds to the accretion model described in Daniels & Hughes (1981b).…”

Section: I G H T-c U Rv E S Y N T H E S I Smentioning

confidence: 99%

Leonid meteor light-curve synthesis

Beech

Murray

2003

Monthly Notices RAS

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An analytic model of dustball meteoroid ablation is developed and used to generate synthesized Leonid meteor light curves. The model light curves are compared against observational data collected during the 1998, 1999, 2000 and 2001 Leonid outbursts. A power‐law distribution of the form m−α is assumed for the fundamental grain mass distribution, and we find that α= 1.6 ± 0.1 provides a good description to the typical Leonid meteor light‐curve morphology, although the range 1.0 ≤α≤ 2.0 is required to explain the entire gamut of observed light curves. We find an interesting discordance between the light‐curve morphologies derived for the 1998 and 1999 Leonid returns; the former light curves being best described by α∼ 1.6, the latter having α∼ 1.0 and being noticeably more rotund in shape. We suggest that the 1999 Leonid meteoroids were relatively rich in larger‐mass fundamental grains. Since, however, both the 1998 and 1999 returns were composed of material ejected from comet 55P/Tempel‐Tuttle in 1899, it is suggested that some form of orbital ‘sifting’, based upon meteoroid structure, has occurred. In addition, we find evidence for the existence of dustball meteoroids that are much richer in larger‐mass grains than a simple power‐law model would predict. Such dustballs may be clustered assemblages produced by accretion in the near‐cometary nucleus environment. We find no clear correlation between Leonid meteor light‐curve morphology and streamlet age, indicating that fragmentation, ‘weathering’ and thermal cycling effects are apparently not important for modifying Leonid meteoroid structure on time‐scales of the order of at least several hundreds of years.

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Section: I G H T-c U Rv E S Y N T H E S I Smentioning

confidence: 99%

Leonid meteor light-curve synthesis

Beech

Murray

2003

Monthly Notices RAS

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“…In this case, the therapist may include non-verbal activities like art (Chapman, Morabito, Ladakakos, Schreier, & Knudson, 2001), dance (Gray, 2001), and sandplay (Daniels & McGuire, 1998) into the session. Research on these types of alternative therapy is scarce and needs further investigation to support their efficacy as independent modalities.…”

Section: Trauma-induced Neurobiological Changes and Their Influence O...mentioning

confidence: 99%

“…Research on these types of alternative therapy is scarce and needs further investigation to support their efficacy as independent modalities. The limited literature on these therapy models indicate their effectiveness in reducing PTSD symptoms in children (Chapman et al, 2001), rebuilding adults' sense of self after torture (Gray, 2001), and communicating recurrent nightmares in adult war survivors (Daniels & McGuire, 1998).…”

Section: Trauma-induced Neurobiological Changes and Their Influence O...mentioning

confidence: 99%