Allan Klassen

Learn More
In order to investigate the formation of radio emitting shock waves above flaring active regions, we combine spectral and imaging observations of type II radio events with X-ray imaging and full-Sun observations and, in one case, with the extrapolated magnetic field configuration in the corona. We confirm and extend earlier findings that type II bursts are(More)
A downhole-to-surface communication channel consisting of a long vertical cylinder (the stem) and an isolated downhole in-line cylinder (the electrode) embedded in a homogeneous earth is considered in this work. A signal voltage is applied between the electrode and stem, and the received voltage is picked up at the surface between the stem and a ground(More)
Ulysses, launched in 1990 October in the maximum phase of solar cycle 22, completed its third out-of-ecliptic orbit in 2008 February. This provides a unique opportunity to study the propagation of cosmic rays over a wide range of heliographic latitudes during different levels of solar activity and different polarities in the inner heliosphere. Comparison of(More)
Wediscuss consequences of the recently reported experimental evidence for third harmonic plasma emission during shock–excited solar radio bursts (type II bursts). Spectrographic and partly imaging observations of three type II bursts displaying three drifting bands with frequencies related as 1 : 2 : 3 have been studied. The radio data of these eventswere(More)
  • O. E. Malandraki, N. Dresing, +10 authors A. Kouloumvakos
  • 2014
The Solar Terrestrial Relations Observatory (STEREO) recordings provide an unprecedented opportunity to study the evolution of solar energetic particle (SEP) events from different observation points in the heliosphere, allowing one to identify the effects of the properties of the interplanetary magnetic field (IMF) and solar wind structures on the(More)
  • 1