WHISTLER DUCTS AND GEOMAGNETIC PULSATION RESONANT FIELD LINE SHELLS NEAR L=2 - ARE THEY IDENTICAL

Data from the processing of about 1700 whistlers recorded in Tihany (L -value of propagation, equatorial electron density and tube content) a re compared with geomagnetic pulsation characteristics (mainly of peri ods) as recorded at the nearby Nagycenk Observatory (L similar to 2). In addition, the number of whistlers recorded at Panska Ves (Czech Rep ublic) for more than ten years (1971-1979, 1987, 1990) are compared wi th the Nagycenk pulsation activity. Both results can be reconciled wit h the supposition that whistler ducts and geomagnetic field line shell s are closely connected with each other as they appear simultaneously with enhanced probability, and the position of these structures is sim ilar within the magnetosphere. (C) 1997 Elsevier Science Ltd.