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Trockner (1970)

Roeder, H.

Weinheim : Wiley-Blackwell

Chemie Ingenieur Technik - CIT 42 (1970), S. 1394-1398

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ISSN: 0009-286X

Schlagwort(e): Chemistry ; Industrial Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Zusätzliches Material: 6 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/cite.330422303

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An Empirically Observed Pitch-Angle Diffusion Eigenmode in the Earth's Electron Belt Near L* = 5.0 (2014)

T. P. O'Brien, S. G. Claudepierre, J. B. Blake, J. F. Fennell, J. H. Clemmons, J. L. Roeder, H. E. Spence, G. D. Reeves, D. N. Baker

Wiley

In: Geophysical Research Letters

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Publikationsdatum: 2014-01-10

Beschreibung: [1] Using data from NASA's Van Allen Probes, we have identified a synchronized exponential decay of electron flux in the outer zone, near L * = 5.0. Exponential decays strongly indicate the presence of a pure eigenmode of a diffusion operator acting in the synchronized dimension(s). The decay has a timescale of about four days with no dependence on pitch angle. While flux at nearby energies and L * is also decaying exponentially, the decay time varies in those dimensions. This suggests the primary decay mechanism is elastic pitch angle scattering, which itself depends on energy and L * . We invert the shape of the observed eigenmode to obtain an approximate shape of the pitch angle diffusion coefficient and show excellent agreement with diffusion by plasmaspheric hiss. Our results suggest that empirically derived eigenmodes provide a powerful diagnostic of the dynamic processes behind exponential decays.

Print ISSN: 0094-8276

Digitale ISSN: 1944-8007

Thema: Geologie und Paläontologie , Physik

Publiziert von Wiley im Namen von American Geophysical Union (AGU).

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Great Sumatra Earthquake Registers on Electrostatic Sensor (2006)

Röder, H. ; Braun, T. ; Schuhmann, W. ; [weitere]

American Geophysical Union

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Publikationsdatum: 2017-04-04

Beschreibung: Strong electrical signals that correspond to the Mw = 9.3 earthquake of 26 December 2004, which occurred at 0058:50.7 UTC off the west coast of northern Sumatra, Indonesia, were recorded by an electrostatic sensor (a device that detects short-term variations in Earth’s electrostatic fi eld) at a seismic station in Italy, which had been installed to study the infl uence of local earthquakes on a new landslide monitoring system. Electrical signals arrived at the station practically instantaneously and were detected up to several hours before the onset of the Sumatra earthquake (Figure 1) as well as before local quakes. The corresponding seismic signals (p-waves) arrived 740 seconds after the start of the earthquake. Because the electrical signals travel at the speed of light, electrical monitoring for the global detection of very strong earthquakes could be an important tool in signifi cantly increasing the hazard alert window.

Beschreibung: Published

Beschreibung: 445-460

Beschreibung: open

Schlagwort(e): Sumatra earthquake ; electrostatic signals ; 04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics

Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)

Materialart: article

Format: 493858 bytes

Format: application/pdf

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