On Jan Mayen, Beerenberg (2277m) extends to approximately the 750mbar level which, on this occasion, is well above the base of the inversion. In Fig. 1 the first visible cyclonic vortex is very well formed and a clear spiral of cloud can be seen. The second cyclonic vortex occurs within the band of convective cloud streets but is still clearly visible. However, the cloud associated with the anticyclonic vortices does not show such a clear circulation. The wavelength of the vortices is around 40km which is typical for such systems generated by Jan Mayen. The effect of the island can still be seen downstream where the clouds appear more chaotic than in the undisturbed flow. The cloud top temperatures, extracted from the 1 1pm imagery, indicate values in the range -12" to -13°C which are consistent with these clouds being trapped under the inversion.

REFERENCES Schwalb, A. (1978) The TIROS-N/NOAA A-G satellite series. NOAA~NESS Tech. Memo. 95 Scorer, R. S. (1978) Environmental Aerodynamics (Ellis Horwood) -(1986) Cloud Investigation by Satellite (Ellis Horwood)

REFLECTED-LIGHT RAINBOW

The photograph on page 368 was taken by Mr. Giles Goyder from his home at Harkstead near Ipswich at about 18ooBST in late September 1987. In addition to the familiar primary and secondary rainbow, a faint arc of a third rainbow can be seen rising from the base of the primary. This is an example of what R. F. Greenler (Rainbows, Hales and Glories, Cambridge University Press, 1980) terms a reflected-light rainbow. The reflected-light rainbow is formed by sunlight reflected from a body of water behind the observer - Mr. Goyder's home is just a quarter of a mile from the Stour Estuary.

The photograph is also an excellent example of the increased brightness of the sky inside the primary rainbow. The primary is formed by sunlight that has undergone its maximum deviation after a single reflection inside the water drops. The brighter region of the sky is due to the greater proportion of sunlight that has undergone smaller deviations.

OBITUARY

c. v. OCKENDEN, OBE

Cyril Victor Ockenden died on 17 July 1988 in Winchester at the age of 91 after a short illness.

Born in London on 12 July 1897, he worked for the Meteorological Office until his retirement, at which time he was the Assistant Director in charge of meteorological communications. During the First World War, he served overseas as a meteorologist with the Royal Engineers in Salonika and, in peace-time, overseas tours took him to Egypt and Iraq.

After his retirement he began a new career as a television weatherman with Southern-Tv, making occasional broadcasts until he was over 80.

His talents and interests were manifold and wide-ranging, and he maintained them until the very end of his life - indeed, on 7 May he attended the Society's special meeting on the Great Storm of 16 October 1987. Southampton TREVOR BAKER

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