The North North Temperate Region

The North-North Temperate Region generally extends from 57° North to 35° North latitude. As mentioned, the North-North Temperate belt (NNTB) can be difficult to observe and is not always present (Fig. 3.4). However, when the belt is present, it is important to note its width and intensity. There may also be seen the occasional projection on its southern edge. Although these are — ^ ^

rare, if present, careful observations and transit timings can yield valuable icancn data concerning drift rates and wind currents. During the 2000-2001 appari- jn g _2

tion, a remarkable, dark segment appeared in the NNTB (Fig. 3.5). In fact, a ^ ^

disk drawing of Jupiter on August 2, 2000 shows this dark segment quite well. & <D 2

Similarly, CCD images by David Moore, I. Ikemura, Peach, Maurizio Di Sciullo, O ^ ^

Antonio Cidadao, and others around the world also captured this dark seg- ^

ment. Observers continued to detect this segment in CCD images in early 2002, although the segment was fading and not near the intensity of 2000-2001. By

April 2002, images by Don Parker revealed a NNTB segment that was broken and spread out. Thus, the feature was long-lived and yielded very useful data concerning the drift rate and wind speeds in this belt. It measured 10-15° in longitudinal length when first seen. Features such as this are very rare in the

NNTB. This one presented a wonderful opportunity to check recent data about currents against that collected in prior years with Earth based telescopes and against wind speed data collected during the Voyager series. Often, the NNTB

goes wanting for such data! This feature was extensively imaged by amateurs using CCD cameras but was also widely observed visually. The feature lasted for over 14 months. The NNTB was unremarkable from June 2002 to May 2004

(Fig. 3.6). However, in April 2006 imagers detected a bright oval and a little red spot (LRS) in the NNTZ. Portions of the NNTB were also seen, reddish-brown in color.

D Parker

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