31 Dec 1998
                        On the solar cycle dependence of winds and planetary waves as seen from mid-latitude D1 LF mesopause region wind measurements
                        
                            Ann. Geophys., 16, 1534–1543,  1998
                     31 Dec 1998
                        Effects of geomagnetic activity on the mesospheric electric fields
                        
                            Ann. Geophys., 16, 1544–1551,  1998
                     31 Dec 1998
                        What causes the variations of the peak intensity of CIR accelerated energetic ion fluxes?
                        
                            Ann. Geophys., 16, 1552–1556,  1998
                     31 Dec 1998
                        A quantitative model of the magnetosphere with poloidal vector fields
                        
                            Ann. Geophys., 16, 1557–1566,  1998
                     31 Dec 1998
                        A case study of electron precipitation in the late substorm growth phase on and nearby a preonset arc
                        
                            Ann. Geophys., 16, 1567–1572,  1998
                     31 Dec 1998
                        Longitudinal (UT) effect in the onset of auroral disturbances over two solar cycles as deduced from the AE-index
                        
                            Ann. Geophys., 16, 1573–1579,  1998
                     31 Dec 1998
                        Low frequency 1/f-like fluctuations of the AE-index as a possible manifestation of self-organized criticality in the magnetosphere
                        
                            Ann. Geophys., 16, 1580–1588,  1998
                     31 Dec 1998
                        Spectral characteristics of spring arctic mesosphere dynamics
                        
                            Ann. Geophys., 16, 1607–1618,  1998
                    