Results 71 to 80 of about 34,661 (210)

Multi-frequency HF radar measurements of artificial F-region field-aligned irregularities [PDF]

, 2004
International audienceWe present radar backscatter power measurements using the CUTLASS HF radar at Hankasalmi, Finland from F-region field-aligned irregularities induced by HF radio pumping with the EISCAT Heating facility.
A. Senior, Rietveld, Michael T., Kosch, M.J., Borisov, N. D., Honary, F., Rietveld, M. T., Senior, A., T. K. Yeoman, Borisov, N.D., M. T. Rietveld, Kosch, M. J., M. J. Kosch, F. Honary, Yeoman, T. K., N. D. Borisov, Yeoman, T.K.   +15 more
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Dynamics of Alfvén waves in the night-side ionospheric Alfvén resonator at mid-latitudes [PDF]

, 2005
International audienceA numerical solution of the problem on dynamics of shear-mode Alfvén waves in the ionospheric Alfvén resonator (IAR) region at middle latitudes at nighttime is presented for a case when a source emits a single pulse of duration ...
Grebnev, I. A., V. V. Alpatov, M. G. Deminov, D. S. Faermark, Kosch, M. J., M. J. Kosch, Faermark, D. S., I. A. Grebnev, Deminov, M. G., Alpatov, V. V.   +9 more
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Seasonal influence on polar cap patches in the high-latitude nightside ionosphere

, 2010
The influence of the season on the patch-to-background density ratio of polar cap patches in the nightside ionosphere was observed above northern Scandinavia around solar maximum (1999–2001).
Wood, Alan, Pryse, SE, S. E. Pryse, Wood, AG, A. G. Wood   +4 more
core   +1 more source

The background absorption at high latitudes [PDF]

, 2003
The high latitude ionosphere is more often disturbed than quiet, i.e. fluxes of charged particles dominate over solar controlled ionisation. Nonetheless, the actual amount of the predictable, solar-controlled ionisation and the resulting absorption is of
Torkar, K. M., S. R. Marple, M. Friedrich, Marple, S. R., K. M. Torkar, Harrich, M., M. Harrich, Friedrich, M.   +7 more
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Enhancing Geomagnetic Disturbance Predictions with Neural Networks: A Case Study on K-Index Classification

Atmosphere
To explore the application of neural networks for estimating geomagnetic field disturbances, this study pays particular attention to K-index classification.
Aizhan Altaibek, Beibit Zhumabayev, Aiganym Sarsembayeva, Marat Nurtas, Diana Zakir   +4 more
doaj   +1 more source

Interplanetary magnetic field control of fast azimuthal flows in the nightside high-latitude ionosphere [PDF]

, 2008
SuperDARN radar data from both hemispheres for the interval January 1999 to November 2006 have been inspected for evidence of high-speed azimuthal flows in the nightside high-latitude ionosphere.
Tim K. Yeoman (7583066), Milan, S. E., Yeoman, T. K., Steve E. Milan (7589666), Grocott, A., Adrian Grocott (7590026)   +5 more
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Artificial optical emissions at HAARP for pump frequencies near the third and second electron gyro-harmonic [PDF]

, 2005
International audienceHigh-power high-frequency radio waves beamed into the ionosphere cause plasma turbulence, which can accelerate electrons. These electrons collide with the F-layer neutral oxygen causing artificial optical emissions identical to ...
F. T. Djuth, T. Pedersen, A. Senior, Hughes, J., Gerken, E., E. Gerken, Marshall, R., Pedersen, T., Senior, A., McCarrick, M., R. Marshall, Djuth, F. T., Kosch, M. J., M. J. Kosch, D. Sentman, J. Hughes, M. McCarrick, Sentman, D.   +17 more
core   +1 more source

Evaluation of a Soviet-Era Gravimetric Survey Using Absolute Gravity Measurements and Global Gravity Models: Toward the First National Geoid of Kazakhstan

Geosciences
Determining a high-precision national geoid is a fundamental step in modernizing Kazakhstan’s vertical reference system. However, the country’s vast territory, complex topography, and limited coverage of modern terrestrial and airborne gravimetric ...
Daniya Shoganbekova, Asset Urazaliyev, Roman Sermiagin, Serik Nurakynov, Magzhan Kozhakhmetov, Nailya Zhaksygul, Anel Islyamova   +6 more
doaj   +1 more source

Magnetic location of a possible earthquake epicentre area: a mathematical model

Geomatics, Natural Hazards & Risk, 2016
We study one of the problems of the theory of seismo-electromagnetic methods of earthquake prediction, namely, the physical nature of magnetic location of a future epicentre.
O.B. Novik, S.V. Ershov, M.N. Volgin, A.O. Novik   +3 more
doaj   +1 more source

Cosmic radio noise absorption events associated with equatorward drifting arcs during a substorm growth phase [PDF]

, 2004
International audienceCosmic radio noise absorption (CNA) events associated with equatorward drifting arcs during a substorm growth phase are studied by using simultaneous optical auroral, IRIS imaging riometer and EISCAT incoherent scatter radar ...
S. R. Marple, Aikio, A. T., A. T. Aikio, J. R. T. Jussila, Shalimov, S., Marple, S. R., S. Shalimov, Jussila, J. R. T.   +7 more
core   +1 more source