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  • 1
    Electronic Resource
    Electronic Resource
    Fifth overtone spectra of carbon-hydrogen stretching vibrations of pyridine, pyrazine, and their related compounds (1991)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 95 (1991), S. 10592-10595 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100179a020
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  • 2
    Electronic Resource
    Electronic Resource
    Prompt proton and electron acceleration to relativistic energies in solar flares (1988)
    Springer
    Solar physics 116 (1988), S. 157-162 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract As a possible mechanism for particle acceleration in the impulsive phase of solar flares, a new particle acceleration mechanism in shock waves is proposed; a collisionless fast magnetosonic shock wave can promptly accelerate protons and electrons to relativistic energies, which was found by theory and relativistic particle simulation. The simultaneous acceleration of protons and electrons takes place in a rather strong magnetic field such that ω ce ≳ ω pe . For a weak magnetic field (ω ce ≪ ω pe ), strong acceleration occurs to protons only. Resonant protons gain relativistic energies within the order of the ion cyclotron period (much less than 1 s for solar plasma parameters). The electron acceleration time is shorter than the ion-cyclotron period.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00171720
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  • 3
    Electronic Resource
    Electronic Resource
    Acceleration through X-type coalescence in a small energetic flare (1989)
    Springer
    Solar physics 123 (1989), S. 389-392 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We studied the acceleration conditions in the small but fairly energetic flare of May 21, 1984 at 13∶26 UT. The most pronounced aspect of this flare was a series of 13 microwave/X-ray spikes, each lasting for about 0.1 s. A previous study has shown that each of these was due to a series of successive sudden formations of small plasma knots of high-energy particles. Each of these knots lost its energy in about 50 ms. In the present study we show that these knots can originate by the process of X-type (3-D) flux tube coalescence. The predicted rise time (30 to 50 ms) and energy are in good agreement with the observationally derived parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00149115
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  • 4
    Electronic Resource
    Electronic Resource
    3-D MHD simulation of plasmoid formation during coalescence of two current loops (1995)
    Springer
    Solar physics 156 (1995), S. 265-280 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We consider two force-free current loops, as proposed by Gold and Hoyle (1960), as the initial current loops, to investigate two types of the magnetic reconnection process, the partial and complete reconnections during coalescence of these loops, by using a 3-D resistive MHD code. It is shown that two plasmoids can be produced on both sides of the coalescence area by both types of the magnetic reconnection process during coalescence of two current loops. It is also shown that strong fast magnetosonic waves can be induced in the partial reconnection case of two-current-loop collision. When two current loops collide locally at two points, four plasmoids can be produced and two of these plasmoids merge into one.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00670227
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  • 5
    Electronic Resource
    Electronic Resource
    Classification of magnetic reconnection during two current-loop coalescence (1992)
    Springer
    Solar physics 142 (1992), S. 399-402 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present a classification of magnetic reconnection during two current loop coalescence, which may be quite important for the physical process of both solar flares and coronal loop heating in the solar active region. It is suggested that different kinds of the current loop coalescence processes could be identified from the soft X-ray telescope(SXT) of the “ Yohkoh ” satellite and the magnetic field data in the active region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00151463
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  • 6
    Electronic Resource
    Electronic Resource
    Ongoing partial reconnection in a limb flare (1995)
    Springer
    Solar physics 158 (1995), S. 391-394 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The limb flare on August 2, 1993 08:30 UT, consisting of two crossed loops, shows evidence of partial X-type reconnection. The observations suggest that partial reconnection was an ongoing process during about 10 min until flare ignition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00795673
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  • 7
    Electronic Resource
    Electronic Resource
    Dynamics of the physical state during two-current-loop collisions (1993)
    Springer
    Solar physics 145 (1993), S. 297-315 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A model of two-current-loop collisions is presented to explain the impulsive nature of solar flares. From MHD equations considering the gravity and resistivity effects we find self-consistent expressions and a set of equations governing the behavior of all physical quantities just after magnetic reconnection has taken place. Numerical simulations have revealed that the most important parameters of the problem are the plasmaβ and the ratio of initial values of pressure gradient in the longitudinal and radial directions. Thus, the low plasmaβ case during aY-type interaction (initial longitudinal pressure gradient is comparable with initial radial pressure gradient) shows a rapid pinch and simultaneous enhancement of all physical quantities, including the electric field components, which are important for high-energy particle acceleration. However, an increase of the plasmaβ causes a weakening of the pinch effect and a decrease of extreme values of all physical quantities. On the other hand, for anX-type collision (initial longitudinal pressure gradient is much greater than initial radial pressure gradient), which is able to provide a jet, the increase of the plasmaβ causes a high velocity jet. As for aI-type collision (initial longitudinal pressure gradient is much less than initial radial pressure gradient) it shows neither jet production nor very strong enhancement of physical quantities. We also consider direct and oblique collisions, taking into account both cases of partial and complete reconnection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00690658
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  • 8
    Electronic Resource
    Electronic Resource
    Modulational instability of fast magnetosonic waves in a solar plasma (1983)
    Springer
    Solar physics 84 (1983), S. 109-118 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Transverse amplitude modulations of fast magnetosonic waves propagating perpendicular to the background magnetic field are shown to be unstable on a time scale τ ∼- λ∥/V aφ, if the wave amplitude φ exceeds a critical value, φ c = C s/V a. The slow modes generated by the modulational instability under gravity can propagate along the magnetic field with the characteristic velocity, V ph = g/2k ∥ V aφ. The applications of this modulational instability and slow-mode generation mechanism to a solar plasma are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00157449
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  • 9
    Electronic Resource
    Electronic Resource
    3-D MHD simulation of the formation of spiral plasma flows during collision of two current loops (1995)
    Springer
    Solar physics 161 (1995), S. 317-330 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present the results from a simulation of the collision between two current loops, by using a 3-D resistive MHD code. We consider two force-free current loops, as proposed by Gold and Hoyle (1960), which are obliquely approaching each other with angular momentum. It is shown that spiral plasma flows are produced after the collision of the two twisting current loops. This process of spiral plasma flow formation is important to understand the plasma mass flows observed in solar active regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00732073
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  • 10
    Electronic Resource
    Electronic Resource
    Magnetic reconnection driven by recombination during collision of two current loops (1996)
    Springer
    Solar physics 169 (1996), S. 367-376 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is shown by using a 3-D resistive MHD simulation code, taking into account the recombination effect, that magnetic reconnection during collision of two current loops can be enhanced by recombination. It is also shown that the temperature in the thin current sheet formed between two loops increases from few to about thirty times larger than a case of no recombination, depending on both the plasma beta and the strength of recombination. The simulation results obtained here may be applicable for a mechanism of chromospheric heating and as an explanation of X-ray bright points as well as solar flares observed in the chromosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00190613
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