ZIB

Hits per page

hits 1 - 2 | 2 hits

Sorting

Electronic Resource

Measurements of the direction of the solar wind using interplanetary scintillation (1998)

Moran, P. J. ; Breen, A. R. ; Varley, C. A. ; [et al.]

Springer

Annales geophysicae 16 (1998), S. 1259-1264

add to mindlist on the mindlist

Details

ISSN: 0992-7689

Keywords: Solar physics ; Astrophysics ; Astronomy ; Magnetic fields ; Space plasma physics ; Charged particle motion and acceleration

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences , Physics

Notes: Abstract EISCAT observations of the interplanetary scintillation of a single source were made over an extended period of time, during which the orientation of the baselines between the two observing sites changed significantly. Assuming that maximum correlation between the scintillations observed at the two sites occurs when the projected baseline is parallel to the direction of plasma flow, this technique can be used to make a unique determination of the direction of the solar wind. In the past it has usually been assumed that the plasma flow is radial, but measurements of eleven sources using this technique have indicated conclusively that in at least six cases observed at mid or high heliocentric latitude there is a significant non-radial component directed in four cases towards the heliocentric equator and in two cases towards the pole.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s00585-998-1259-3

Permalink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

Electronic Resource

Excited fluorescence in low-Z elements by the low-energy gamma transitions and L X-rays from a 241-am XRF source (1987)

Delgado, V. ; González, L. ; López, A. ; [et al.]

New York, NY [u.a.] : Wiley-Blackwell

X-Ray Spectrometry 16 (1987), S. 143-146

add to mindlist on the mindlist

Details

ISSN: 0049-8246

Keywords: Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Physics

Notes: The influence of the photons emitted by a 241Am XRF excitation source below 59.6 keV on sample fluorescence production has been analysed. A general method for evaluating the contribution of the various lines from the source in specific equipment configurations is presented. The excitation was performed with 23 elemental targets and the measured experimental intensities were fitted by means of a minimization program which takes into account the most important transition groups observed in the spectrum of the excitation source. The program allows for attenuation of excitation and fluoresced photons in the target. Intensity data for the exciting beam were compared with the theoretical intensities of photons from 237Np, and it was concluded that these values are compatible with the Am and Al thicknesses of the excitation source. Correction factors considering low-energy transitions were calculated for several elements for both thick and thin targets. The over-excitation evaluated for Z = 34 reached values ranging between 180% and 550%.

Additional Material: 1 Ill.