Outstanding Solar Radio Burst at 4.2 mm

Details Outstanding Solar Radio Burst at 4.2 mm Outstanding Solar Radio Burst at 4.2 mm

Mar 1969

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969natur.221..945c&link_type=abstract

Nature, Volume 221, Issue 5184, pp. 945-947 (1969).

Physics

9

Scientific paper

ALTHOUGH the Sun has been studied extensively over a wide range of radio-wavelengths for 20 yr, until recently there have been very few observations at wavelengths of less than 3 cm and even fewer at wavelengths of less than 1 cm (that is, in the millimetre band). We report here the observation of a major radio burst at 4.2 mm (71 GHz) and 16 mm (19 GHz). This burst, which was associated with a class 2B flare1 at 0944 UT on July 6, 1968, may be the largest ever recorded at millimetre wavelengths, and in any case ranks among the largest bursts ever observed at any wavelength2. It is particularly interesting to note that at the most commonly used solar-monitoring wavelength in the microwave band (10.7 cm) the burst was only of very moderate intensity. The details of the burst, as recorded at the Slough Solar Radio Observatory (51° 29' 1ST, 0° 34' W), are given in Table 1 and Fig. 1. (The 10.7 cm data were provided by Mr A. Cribbens of University College, London.)

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