OPTICAL AND RADIO SPECTRAL ANALYSIS OF A RECURRENT SURGE

Coordinated observations obtained at Meudon (MSDP) and at Ondejov provide surge spectra in optical range (H, H, H, Hµ, Ca H and K lines) and in radio range. The MSDP data allowed us to follow the time evolution of the surge. The spectra of Balmer lines were used to derive the electron density of the expelled cool material. The radio bursts indicate that the acceleration of electrons took place in the low and dense atmosphere, giving a good argument for a reconnection near the transition region.     

Biostratigraphic correlation of the Kärlich Interglacial, Northwestern Germany

Palaeobotanical investigations of limnic sediments in the Karlich clay pit (Middle Rhine area) in Northwestern Germany indicate that deposition took place during a middle Pleistocene interglacial, the initial part of which is absent at the site investigated. Of special biostratigraphic importance is the occurrence of taxa Azolla filiculoides, Pterocarya and Celtis auslralis. In the Carpinus-Betula zone of this interglacial, early Palaeolithic artifacts are present. Remains of mammalian fauna have been found in the investigated layers. The interglacial has no clear palaeobotanic equivalent in Northwestern Europe, but the intermediate character of the palaeoflora suggests an intra-Saalian age.