http://hdl.handle.net/2122/108 Search the Channel search http://www.earth-prints.org/simple-search http://hdl.handle.net/2122/3668 Title: La variazione secolare del campo geomagnetico <br/> <br/>Authors: Meloni, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia Thu, 29 Oct 1992 22:58:59 GMT http://hdl.handle.net/2122/1684 Title: Probable values of rise and fall off time of solar cycles 23,24, and 25 <br/> <br/>Authors: Ortiz de Adler, N.; Laboratorio de Ionosfera, Instituto de Fisica, Facultad de Ciencias Exactas y Tecnologia, Universidad Nacional de Tucuman, Argentina; Elias, A. G.; Consejo Nacional de Investigaciones Cientificas y Técnicas, Buenos Aires, Argentina <br/> <br/>Abstract: From an analysis of the rise and fall off time of solar cycles 4 to 22, a recurrence tendency of 7 cycles is observed in the rise time and, apparently, of 9 cycles in the fall off time. The envelope of these times presents a decreasing amplitude of oscillation. According to this behaviour, the rise and fall length of future solar cycles until cycle 25 can be inferred qualitatively. These values are compared with those obtained with a multiple regression method showing a good agreement. Sun, 28 Apr 1996 22:58:59 GMT http://hdl.handle.net/2122/1494 Title: Solar cycle 22 control on daily geomagnetic variation at Terra Nova Bay (Antarctica) <br/> <br/>Authors: Cafarella, L.; Istituto Nazionale di Geofisica, Roma, Italy; Meloni, A.; Istituto Nazionale di Geofisica, Roma, Italy; Palangio, P.; Istituto Nazionale di Geofisica, Roma, Italy <br/> <br/>Abstract: Nine summer geomagnetic observatory data (1986-1995) from Terra Nova Bay Base, Antarctica (Lat.74.690S, Long. 164.120E, 80.040S magnetic latitude) are used to investigate the behaviour of the daily variation of the geomagnetic field at polar latitude. The instrumentation includes a proton precession magnetometer for total intensity |F| digital recordings; DI magnetometers for absolute measuring of the angular elements D and I and a three axis flux-gate system for acquiring H,D Z time variation data. We find that the magnetic time variation amplitude follows the solar cycle evolution and that the ratio between minimum solar median and maximum solar median is between 2-3 for intensive elements (H and Z) and 1.7 for declination(D). The solar cycle effect on geomagnetic daily variation elements amplitude in Antarctica, in comparison with previous studies, is then probably larger than expected. As a consequence, the electric current system that causes the daily magnetic field variation reveals a quite large solar cycle effect at Terra Nova Bay. Thu, 29 Oct 1998 22:58:59 GMT http://hdl.handle.net/2122/1474 Title: The solar-cycle variation of M(3000)F2 and its correlation with that of f0F2 <br/> <br/>Authors: Kouris, S. S.; Electrical Engineering Department, Aristotelian University of Thessaloniki, Greece <br/> <br/>Abstract: Using hourly monthly-median measured values from nine long-standing ionospheric sounding stations with data sets extending over several decades, best-fit empirical relationships are established for M (3000)F2 with different solar and ionospheric indices representative of state of the solar cycle. The statistical analysis shows that there is no difference in the degree of correlation in using one index over another. Comparisons are also made with similar relationships for monthly median f0F2 determined from the corresponding measurement data sets and the degree of correlation between the two ionospheric parameters is established. Mon, 28 Sep 1998 22:58:59 GMT