It is shown that among the equatorial counterelectrojets there are two distinct categories, the fast one and the slow one, having different characteristics. In a recent communication [Kane, 1978> it was shown that there is no clear-cut relationship between equatorial counterelectrojet and interplanetary magnetic field (IMF). In the communications Rastogi and Patel [1975> and Patel [1978>, sharp decreases in the equatorial H field during daytime (also termed as counterelectrojets by these authors) are shown to be associated with rapid fluctuations of the latitude &THgr; of the IMF. From private conversations and correspondence, it seems that many people consider the latter results as contradiction of the former one. Contradictory opinions in scientific matters are neither uncommon nor unwelcome, as these aid the free spirit of scientific enquiry. However, in the present case, no contradiction whatsoever is involved, as is explained below. There are two distinct categories of equatorial counterelectrojets, and their characteristics are described in the sections that follow. |