Academician Ilmo Hela

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Geophysical Society 1926-1975

Veikko Rossi

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A Simple Method to Estimate Cloudiness at an Automatic Weather Station

Alf Nyberg and Helge Björklund

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The Interaction of the Monthly Mean Flow and Large-Scale Transient Eddies in two Different Circulation Types

Hannu Savijärvi

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Sporadic E-layer and Magnetic Activity at Sodankylä

Tauno Turunen

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The Diurnal Variation of Es-layer parameters at Sodankylä in Summer 1973 Based on Ionospheric Soundings Utilizing Low Fixed Gain

Tauno Turunen

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The Long Term Variation of Es-layer Parameters at Sodankylä 1958-1972

Tauno Turunen

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Statistical Behaviour of Sporadic E at Sodankylä 1958-1971

Tauno Turunen and M. Mukunda Rao

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Constants of Long-period Seismographs at Nurmijärvi (Finland)

Vladimír Tobyáš, Pekka Teikari and Eijo Vesanen

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Short-period Seismic Noise Variations in Southern Finland

Urmas Luosto

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Detection of Signal Power in the Presence of Noise

Ilkka Noponen and Erkki Mikkola

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Detection Capability of India Meteorological Department Seismological Stations Situated in South India

T. K. S. Prakasa Rao and V. S. Rao

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Analogue Tape Recording System for Seismological Use

Seppo Nurminen

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PCM Tape Recording System for Seismological Use Constructed of C-MOS Intergrated Circuits

Seppo Nurminen

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Determination of Movements in the Earth's Crust by the Finite Element Method

Jukka Aalto and Eero-Matti Salonen

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