The roles of charge exchange and dissociation in spreading Saturn's neutral clouds

B. L. Fleshman; P. A. Delamere; F. Bagenal; T. Cassidy

doi:10.1029/2011je003996

The roles of charge exchange and dissociation in spreading Saturn's neutral clouds

Journal of Geophysical Research Atmospheres ◽

10.1029/2011je003996 ◽

2012 ◽

Vol 117 (E5) ◽

pp. n/a-n/a ◽

Cited By ~ 36

Author(s):

B. L. Fleshman ◽

P. A. Delamere ◽

F. Bagenal ◽

T. Cassidy

Keyword(s):

Charge Exchange ◽

Neutral Clouds

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How much Io material reaches Europa?

10.5194/epsc2020-486 ◽

2020 ◽

Author(s):

Fran Bagenal ◽

Vincent Dols ◽

Edward Nerney ◽

Frank Crary ◽

Tim Cassidy

Keyword(s):

Charge Exchange ◽

Neutral Atoms ◽

Plasma Interaction ◽

High Energies ◽

Energetic Neutral Atoms ◽

Neutral Clouds ◽

Atmosphere Interaction ◽

Plasma Torus ◽

Io Plasma Torus

<p>The plasma interaction with Io&#8217;s atmosphere results in at least a ton per second of escaping neutrals. Most of these neutrals supply extended neutral clouds along Io's orbit &#160;and eventually become ionized and accelerated to corotation with Jupiter, populating the Io plasma torus as well as spreading out to fill Jupiter&#8217;s vast magnetosphere. About half to two-thirds of the plasma torus ions charge-exchange with the extended neutral clouds &#160;and leave the torus as energetic neutral atoms, passing Europa&#8217;s orbit. Energetic neutrals are also produced directly in the plasma-atmosphere interaction, escaping with sufficient speed to reach Europa&#8217;s orbit before being ionized. The iogenic ions that are accelerated to high energies in the middle magnetosphere ultimately move back inward, again crossing Europa&#8217;s orbit. We present estimates of the fluxes of these various iogenic populations and how much oxygen, sulfur and sodium might be hitting Europa.</p>

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First H+ Charge-Exchange Images in the Stim.

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100092487 ◽

1976 ◽

Vol 34 ◽

pp. 504-505

Author(s):

Wm. H. Escovitz ◽

T. R. Fox ◽

R. Levi-Setti

Keyword(s):

Charge Exchange ◽

Neutral Component ◽

Channel Electron Multiplier ◽

Electron Multiplier ◽

Neutral Particles ◽

Charged Beam ◽

Scanning Transmission ◽

Contrast Mechanism ◽

Ion Microscopy ◽

Beam Component

Charge exchange, the neutralization of ions by electron capture as the ions traverse matter, is a well-known phenomenon of atomic physics which is relevant to ion microscopy. In conventional transmission ion microscopes, the neutral component of the beam after it emerges from the specimen cannot be focused. The scanning transmission ion microscope (STIM) enables the detection of this signal to make images. Experiments with a low-resolution 55 kV STIM indicate that the charge-exchange signal provides a new contrast mechanism to detect extremely small amounts of matter. In an early version of charge-exchange detection (fig. 1), a permanent magnet installed between the specimen and the detector (a channel electron multiplier) sweeps the charged beam component away from the detector and allows only the neutrals to reach it. When the magnet is removed, both charged and neutral particles reach the detector.

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