Limits on decametric radiation from the shoemaker-levy 9 impacts on jupiter

Observations were carried out from South Africa (lat. = -25?89, long. = 27?69) of the collisions of fragments A, E, H, Q1, Q₂, and S with Jupiter. The excellent observing location and winter ionosphere allowed observations at important low frequencies not routinely accessible at other sites. Observations were carried out at 7.06, 8.7, 10.2, and 11.9 MHz, and in the entire band 12.4-34 MHz. No signals which could definitely be attributed to the collisions were seen. Significant upper limits on the emissions, depending on frequency and on the observing conditions during the particular impact, were obtained.