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  • PLASMA PHYSICS  (5)
  • Haplophyllum cappadocicum  (3)
  • 1
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    Evolution of the plasmoid-lobe interaction with downtail distance (1994)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: This study examines the interaction between plasmoids moving anti-sunward at high speeds and the tail lobes which bound them to the north and south. Attention is focused on the influence of changing lobe conditions with downtail distance. It is shown using International Sun Earth Explorer 3 (ISEE 3) measurements that the gradual filling of the lobes with mantle plasma and the decrease in magnetic field intensity reduces the average lobe MHD fast mode speed from 1200 km/s at X = -80 R(sub E) to 400 km/s at X = -220 R(sub E). This results in the ratio of the plasmoid speed to the fast mode speed increasing with downtail distance, from 0.3 at X = -80 R(sub E) to approx. 1 at X = -220 R(sub E). It is argued that the 'standard' traveling compression region (TCR) signature observed closer to the Earth will be distorted at large distances, where the fast mode transit time between the plasmoid and magnetopause becomes long compared to the time for the plasmoid to move past a given point in the tail. This change in the nature of the plasmoid-lobe interaction with downtail distance is offered as an explanation for why the reported rate of TCR occurrence peaks at X = -60 to -130 R(sub E) and decreases in the more distant fail.
    Keywords: PLASMA PHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 21; 24; p. 2765-2768
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Magnetic field-aligned electric potentials in nonideal plasma flows (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The electric field component parallel to the magnetic field arising from plasma flows which violate the frozen-in field condition of ideal magnetohydrodynamics is discussed. The quantity of interest is the potential U = integral E parallel ds where the integral is extended along field lines. It is shown that U can be directly related to magnetic field properties, expressed by Euler potentials, even when time-dependence is included. These results are applicable to earth's magnetosphere, to solar flares, to aligned-rotator models of compact objects, and to galactic rotation. On the basis of order-of-magnitude estimates, these results support the view that parallel electric fields associated with nonideal plasma flows might play an important role in cosmic particle acceleration.
    Keywords: PLASMA PHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 380; 293-301
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    NASA TECHNICAL REPORTS
  • 3
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    Magnetotail reconnection, MHD theory and simulations (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: Magnetotail reconnection leading to plasmoid formation and ejection is discussed, emphasizing three-dimensional structures and deviations from earlier imposed symmetries, based on MHD simulations and topological considerations. In general, the separation of the plasmoid takes a finite amount of time. During this stage the plasmoid is characterized by filamentary structures of interwoven flux tubes with different topological connections.
    Keywords: PLASMA PHYSICS
    Type: ESA, Proceedings of an International School and Workshop on Reconnection in Space Plasma, Volume 2; p 217-221
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    NASA TECHNICAL REPORTS
  • 4
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    Flux transfer events: Reconnection without separators (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: A topological analysis of a simple model magnetic field of a perturbation at the magnetopause modeling an apparent flux transfer event is presented. It is shown that a localized perturbation at the magnetopause can in principle open a closed magnetosphere by establishing magnetic connections across the magnetopause. Although the model field exhibits neutral points, these are not involved in the magnetic connection of the flux tubes. The topological substructure of a localized perturbation is analyzed in a simpler configuration. The presence of both signs of the magnetic field component normal to the magnetopause leads to a linkage of topologically different flux tubes, described as a flux knot, and a filamentary substructure of field lines of different topological types which becomes increasingly complicated for decreasing magnetic shear at the magnetopause.
    Keywords: PLASMA PHYSICS
    Type: ESA, Proceedings of an International School and Workshop on Reconnection in Space Plasma, Volume 2; p 263-268
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    General magnetic reconnection, parallel electric fields, and helicity (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: This paper considers the concept of magnetic reconnection from a general point of view, with special consideration given to magnetic reconnection in nonvanishing magnetic fields, i.e., finite-B reconnection as distinct from zero-B reconnection. It is shown that the electric field component parallel to the magnetic field (E-parallel) plays a crucial physical role in finite-B reconnection. Two theorems involving E-parallel are proposed. The first defines a necessary and sufficient condition of E-parallel for global reconnection to occur. The second theorem is concerned with the change of magnetic helicity to E-parallel for cases where the electric field vanishes at large distances. The general magnetic reconnection concept is tested by applying it to the process of plasmoid formation process.
    Keywords: PLASMA PHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 93; 5547-555
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    NASA TECHNICAL REPORTS
  • 6
    Electronic Resource
    Electronic Resource
    Lignans and lignan glycosides from Haplophyllum cappadocicum
    Amsterdam : Elsevier
    Phytochemistry 37 (1994), S. 1693-1698 
    Details
    ISSN: 0031-9422
    Keywords: Haplophyllum cappadocicum ; Rutaceae ; arylnaphthalene lignan glycosides ; aryltetrali ; lignan glycosides ; lignans ; unsaturated dibenzylbutyrolactones
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0031-9422(00)89594-1
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Isodaurinol, an arylnaphthalene lignan from Haplophyllum cappadocicum
    Amsterdam : Elsevier
    Phytochemistry 31 (1992), S. 2473-2475 
    Details
    ISSN: 0031-9422
    Keywords: Haplophyllum cappadocicum ; Rutaceae ; arylnaphthalene lignans ; coumarins. ; dibenzylbutyrolactone lignans ; furoquinoline alkaloids ; isodaurinol ; matairesinol
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-9422(92)83302-F
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  • 8
    Electronic Resource
    Electronic Resource
    Lignans and lignan glycosides fromHaplophyllum cappadocicum
    Amsterdam : Elsevier
    Phytochemistry 37 (1994), S. 1693-1698 
    Details
    ISSN: 0031-9422
    Keywords: Haplophyllum cappadocicum ; Rutaceae ; arylnaphthalene lignan glycosides ; aryltetrali ; lignan glycosides ; lignans ; unsaturated dibenzylbutyrolactones
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0031-9422(00)89594-1
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