Pc4 giant pulsations recorded in Tromsø, 1929–1985

In this investigation terrestrial magnetic records for 1929–1985 from the Auroral Observatory in Tromsø have been examined for giant micropulsations (Pg). This period encompasses five solar cycles and supplements the work of Harang, who studied the records from the time such recordings started in Tromsø in March 1929 through March 1941. In agreement with Harang, an anticorrelation with the solar cycle is found in the frequency of occurrence of the micropulsations. A seasonal variation with maxima in March and September is clearly revealed, as already indicated in Harang's much more limited data set. Also in support of Harang, it is found that the period of oscillation tends to increase for long lasting pulsations and for recurring ones. Contrary to Harang, who found a daily maximum between 0100 and 0200 UT, however, we find the maximum to occur somewhere between 0200 and 0300 UT.     

Publications received 1984–1985

José Manuel Sánchez Ron (1997): INTA. 50 años de ciencia y técnica aeroespacial (Madrid: INTA)

Dieter Hoffmann and Kristie Macrakis (eds.), Naturwissenschaft und Technik in der DDR (Berlin: Akademie Verlag, 1997), pp. 410.

Monika Renneberg and Mark Walker (eds.), Science, Technology and National Socialum (Cambridge: Cambridge University Press, 1994), pp. 422.

Keith Wailoo, Drawing Blood: Technology and Disease Identity in Twentieth‐Century America, (Baltimore &; London: The Johns Hopkins University Press, 1997), xii+288 pp., ill.

Richard H. Grove, Green Imperialism: Colonial Expansion, Tropical Islands and the Origins of Environmentalism. 1660–1860 (Cambridge: Cambridge University Press, 1995 (HB) and 1996 (PB)), pp. xiv+540.

Peter Galison, Image and Logic. A Material Culture of Mkrophysics. (Chicago and London: The University of Chicago Press, 1997) pp. xxv+955.