On auroral ion conics and electron beams acceleration

Evgeny Mishin; Marek Banaszkiewicz

doi:10.1029/1998gl900165

Ion conics and electron beams associated with auroral processes on Saturn

Journal of Geophysical Research Atmospheres ◽

10.1029/2008ja013621 ◽

2009 ◽

Vol 114 (A2) ◽

pp. n/a-n/a ◽

Cited By ~ 66

Author(s):

D. G. Mitchell ◽

W. S. Kurth ◽

G. B. Hospodarsky ◽

N. Krupp ◽

J. Saur ◽

...

Keyword(s):

Electron Beams ◽

Ion Conics

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A statistical study of field-aligned electron beams associated with ion conics events

Annales Geophysicae ◽

10.1007/s00585-998-0940-x ◽

1998 ◽

Vol 16 (8) ◽

pp. 940-947 ◽

Cited By ~ 1

Author(s):

W. Miyake ◽

T. Mukai ◽

N. Kaya

Keyword(s):

Pitch Angle ◽

Statistical Study ◽

Electron Beams ◽

Electron Acceleration ◽

Average Height ◽

Average Thickness ◽

Acceleration Region ◽

Association Rate ◽

Auroral Phenomena ◽

Ion Conics

Abstract. A statistical study of field-aligned electron beams associated with upflowing ion conics is presented from Exos-D (Akebono) observations below 10 000 km. The electron beams are narrowly collimated along the field line and generally have energies of several tens of eV. They are divided in the analysis into three types: upflowing, downflowing, and counterstreaming. All the types of electron beams are almost equivalent in their energy and pitch angle characteristics and their association rate with upflowing ion events. About 50% of ion conics are found to be coincident with field-aligned electron beams. There is also a correlation in energy between the field-aligned electrons and ion conics. These show that the association is not a mere coincidence but rather that the field-aligned acceleration of electrons is related to the perpendicular energization of ions. The association rate of upflowing electrons is high on the nightside, while that of downflowing electrons is high on the dayside. The association rate of downflowing electrons is high at low altitudes, and the rates of the three types of electron beams become equivalent at high altitudes. Data indicate that the height of the electron acceleration region is lower on the nightside. It is suggested that the average height of the electron acceleration region is around the satellite apogee (–10000 km), and the average thickness of the region is about thousands km.Key words. Ionosphere-magnetosphere interactions · Particle acceleration · Auroral phenomena

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A statistical study of field-aligned electron beams associated with ion conics events

Annales Geophysicae ◽

10.1007/s005850050664 ◽

1998 ◽

Vol 16 (8) ◽

pp. 940 ◽

Cited By ~ 6

Author(s):

W. Miyake ◽

T. Mukai ◽

N. Kaya

Keyword(s):

Statistical Study ◽

Electron Beams ◽

Ion Conics

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Correlations between ion conics and electron beams observed by the Viking satellite in the cusp-cleft region

Geophysical Research Letters ◽

10.1029/90gl01579 ◽

1991 ◽

Vol 18 (9) ◽

pp. 1679-1682 ◽

Cited By ~ 2

Author(s):

B. Thelin ◽

R. Lundin ◽

B. Aparicio

Keyword(s):

Electron Beams ◽

Ion Conics

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Materials for Electron Beam Information Storage

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100062671 ◽

1969 ◽

Vol 27 ◽

pp. 152-153 ◽

Cited By ~ 1

Author(s):

D. E. Speliotis

Keyword(s):

Magnetic Field ◽

Electron Beam ◽

Recent Literature ◽

Electron Beams ◽

Information Storage ◽

The Subject ◽

The Magnetic Field

The interaction of electron beams with a large variety of materials for information storage has been the subject of numerous proposals and studies in the recent literature. The materials range from photographic to thermoplastic and magnetic, and the interactions with the electron beam for writing and reading the information utilize the energy, or the current, or even the magnetic field associated with the electron beam.

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Energy Distribution in Electron Beams

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100096096 ◽

1972 ◽

Vol 30 ◽

pp. 568-569

Author(s):

Tamotsu Ohno

Keyword(s):

Electron Beam ◽

Energy Distribution ◽

Cross Section ◽

Integral Curve ◽

Electron Beams ◽

Electron Gun ◽

Angular Divergence ◽

Apparent Increase ◽

Integral Width ◽

The Cross

The energy distribution in an electron; beam from an electron gun provided with a biased Wehnelt cylinder was measured by a retarding potential analyser. All the measurements were carried out with a beam of small angular divergence (<3xl0-4 rad) to eliminate the apparent increase of energy width as pointed out by Ichinokawa.The cross section of the beam from a gun with a tungsten hairpin cathode varies as shown in Fig.1a with the bias voltage Vg. The central part of the beam was analysed. An example of the integral curve as well as the energy spectrum is shown in Fig.2. The integral width of the spectrum ΔEi varies with Vg as shown in Fig.1b The width ΔEi is smaller than the Maxwellian width near the cut-off. As |Vg| is decreased, ΔEi increases beyond the Maxwellian width, reaches a maximum and then decreases. Note that the cross section of the beam enlarges with decreasing |Vg|.

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