Results of the dutch cosmic ray expedition 1933: IX. The ionisation-balance for cosmic rays on the ocean

✍ Scribed by J. Clay; M. Rutgers van der Loeff

• Publisher: Elsevier Science
• Year: 1936
• Weight: 638 KB
• Volume: 3
• Category: Article
• ISSN: 0031-8914
• DOI: 10.1016/s0031-8914(36)80352-8

✦ Synopsis

In the following pages the results are given of the measurements of the number and the average life of ions, and of the number of charged and uncharged condensation-nuclei in the air on the open sea.

The number of fast ions was constantly recorded with the aid of an E be r t-aspirator combined with an electrometer-triode. We watched the diurnal variation in Bandoeng, the influence of our approach to the coast, of fog and of rain and we tried to determine the mobility-spectrum. The average of all the measurements of ions caught in the aspirator was 213 ions per cc of air.

Following S c h wei die r's ,,~Iethod II" the "half-value voltage" was determined; as an average we find H = 0.80 Volt, corresponding to an average life .& = 63 sec.

. Calculation of the ionisation on the ocean from the balance (see preceding paper) gives as an average q = 2.0 J. in sufficient agreement with the value q between 1,8 and 2,1 J, due to cosmic radiation only.