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Thursday, May 7, 2020 | History

2 edition of corona mechanism in the presence of a magnetic field found in the catalog.

corona mechanism in the presence of a magnetic field

Hall, Robert L.

corona mechanism in the presence of a magnetic field

by Hall, Robert L.

  • 87 Want to read
  • 35 Currently reading

Published .
Written in English

    Subjects:
  • Corona (Electricity).,
  • Magnetism.

  • Edition Notes

    Statementby Robert Leonard Hall.
    The Physical Object
    Pagination42 leaves, bound :
    Number of Pages42
    ID Numbers
    Open LibraryOL14300566M

      Alfvén waves, transverse incompressible magnetic oscillations, have been proposed as a possible mechanism to heat the Sun's corona to millions of degrees by transporting convective energy from the photosphere into the diffuse corona. We report the detection of Alfvén waves in intensity, line-of-sight velocity, and linear polarization images of the solar corona taken using the FeXIII Cited by:   Now most scientists believe that the heating of the corona is linked to the interaction of the magnetic field lines radiating out of the small patches mentioned above. Because the laws of electromagnetism prohibit the intersection of two magnetic field lines, every time magnetic field lines come close to crossing they are "rearranged," and this.

      Surface motion on the photosphere is one of the two mechanisms proposed to buildup the free energy in the corona (the other is the emergence of magnetic field). It can produce current sheets parallel to a separatrix that detach the interacting magnetic flux regions (Sweet ; Lau ; see Somov for a review).Cited by: 7. The corona discharge along the field lines and that field lines ending outside 0 65° usually originate on the point surface outside the ionization region. The Warburg distribution is sketched in Fig. 1. In point-to-plane unipolar current coronas, as well as in wire-cylinder or wire-plane ones, space.

    Abstract. Fertilized chicken eggs were incubated for 48 hours while exposed to extremely low frequency magnetic fields (ELMF) of 10 Hz, Hz and Hz with intensities of , and 12 micro T. Gross morphological and histological analysis of the exposed embryos revealed the following effects: (1) ELMF of Hz/ micro T had the most consistent and powerful inhibitory effect on Cited by:   The standard view of coronal heating is that free magnetic energy is either built up in the corona or transported to the corona, due to shuffling of the magnetic field lines in the photosphere (e.g.). The majority of coronal heating models proposed so far invoke either dissipation of magnetohydrodynamic (MHD) waves or magnetic by:


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Corona mechanism in the presence of a magnetic field by Hall, Robert L. Download PDF EPUB FB2

The corona mechanism in the presence of a magnetic fieldAuthor: Robert L. Hall. Protein corona of magnetic PEI/siRNA complex under the influence of a magnetic field improves transfection efficiency via complement and coagulation cascades †.

Peipei Jiang,a Yue Zhu,a Ke Kang,a Bin Luo,a Jing He *a and Yao Wu *a. Author affiliations. A coronal mass ejection (CME) is a significant release of plasma and accompanying magnetic field from the solar often follow solar flares and are normally present during a solar prominence eruption.

The plasma is released into the solar wind, and can be observed in coronagraph imagery. Coronal mass ejections are often associated with other forms of solar activity, but a broadly. He envisaged the possibility of using the observations to measure the magnetic field intensity, although the utility of type II frequency splitting as a technique for magnetic field measurements Cited by: 4.

Indian scientists show how chaotic magnetic field lines result in stronger current sheets and extreme heating of the sun’s corona. From the Journal: Physics of Plasmas WASHINGTON D.C., August 9, — It is known that the sun’s corona — the outermost layer of the sun’s atmosphere — is roughly times hotter than its photosphere — the sun’s visible layer.

Recent developments in the theory for heating the corona, including a self consistent magnetohydrodynamic turbulence mechanism and new ways of creating current sheets by shearing force free fields.

The cosmic magnetic fields in regions of low plasma pressure and large currents, such as in interstellar space and gaseous nebulae, are force-free in the sense that the Lorentz force vanishes. Abstract: The underlying origin of solar eruptive events (SEEs), ranging from giant coronal mass ejections to small coronal-hole jets, is that the lowest-lying magnetic flux in the Sun's corona undergoes the continual buildup of stress and free energy.

This magnetic stress has long been observed as the phenomenon of "filament channels:" strongly sheared magnetic field localized around Cited by: 6.

The current sheets, believed to be produced in the coronal plasma, are potential sites for magnetic reconnections, which provide a mechanism for extreme heating of the corona. Magnetic fields are produced due to the movement of electrical charge and they are present around permanent magnets and current carrying conductors (magnetic circuit) as shown in Figure In permanent magnets, revolving electrons produce an external field.

If a current carrying conductor is wounded to form a coil of multiturns, the magnetic field is stronger than that of a single. Iran's Military Says It Can Detect Coronavirus with Magnetic Fields.

the effect of increasing the presence of people around the city will be witnessed in. Progress in knowledge of corona mechanisms began in the late 's with the availability of the first single-sweep cathode ray oscilloscopes. Vastly improved instrumentation after World War II led to rapid development of the field, the results being published in a world-wide diversity of journals.5/5(2).

As shown in Fig. the common feature of all formation schemes is application of an electromotive force (EMF) along initially vacuum magnetic field lines so as to drive field-aligned plasma current. In the first edition of this book it was stated at this point.

Coronal magnetic fields calculated by the methods developed in Paper I (Altschuler and Newkirk, ) and the empirical description of the solar corona of November derived in Paper II (Newkirket al., ) are combined in order to investigate what connection exists between the magnetic fields and the density structure of the corona.

To facilitate the comparison of magnetic fields with Cited by:   The fundamental mechanism initiating coronal mass ejections (CMEs) remains controversial.

One of the leading theories is magnetic breakout, in which magnetic reconnection occurring high in the corona removes the confinement on an energized low-corona structure from the overlying magnetic field, thus allowing it to erupt. Here, we report critical observational evidence of Cited by: ELEMENTAL ABUNDANCE DIFFERENTIATION IN THE SOLAR CHROMOSPHERE - CORONA Raphael Steinitz Physics Dept., Ben-Gurion University, Israel There are indications that elemental abundances in the corona and in the solar wind are modified relative to their photospheric (and perhaps chromospheric) : Raphael Steinitz.

Scientific studies suggest that electric and magnetic fields are unlikely to be harmful at the levels normally found in homes, although there is some uncertainty regarding certain health effects. The magnetic field contributes additional pressure to the corona, which results in more heating via the shear stress.

The effect is similar to an increase in α, it leads to an increase of evaporation rate in the inner region while little effect in the outer by: The exact mechanism by which the corona is heated is still the subject of some debate, but likely possibilities include induction by the Sun's magnetic field and magnetohydrodynamic waves from below.

The outer edges of the Sun's corona are constantly being transported away due to open magnetic flux and hence generating the solar wind. Braiding and twisting of magnetic field structures, which is caused by the convective flows at the solar surface, was suggested as an efficient mechanism for atmospheric heating by:.

Fast magnetoacoustic waves and magnetic field measurements in the solar corona with the Low Frequency Array by Community of European Solar Radio Astronomers Figure 1.The Meissner effect (or Meissner–Ochsenfeld effect) is the expulsion of a magnetic field from a superconductor during its transition to the superconducting state when it is cooled below the critical temperature.

The German physicists Walther Meissner and Robert Ochsenfeld discovered this phenomenon in by measuring the magnetic field distribution outside superconducting tin and. We present a review of the different aspects associated with the interaction of successive coronal mass ejections (CMEs) in the corona and inner heliosphere, focusing on the initiation of series of CMEs, their interaction in the heliosphere, the particle acceleration associated with successive CMEs, and the effect of compound events on Earth's by: