Keeping a Record The Logbook

Most of us find it relatively easy to remember the date and circumstance surrounding the individual pictures taken over the years in the family photo album. Family pictures are, well, familiar to us. We know the people in them, or we remember in great detail the family vacation they depict. Family pictures represent familiar surroundings. The collecting of scientific data, or the making of astronomical images or sketches is a totally different situation. It is not nearly so easy to remember the...

The South Temperate Region

The South Temperate Region generally extends from latitude 27 south to 37 south. In the past, this region has displayed some of the most interesting features on the planet. The STB can be thought of as the southern counter part to the NTB. Like the NTB, it is a relatively narrow belt and usually not nearly as dark as the SEB. Its coloration is often described as gray, but I often note a touch of reddish-brown in the belt also. During the apparitions of 2001, 2002, and 2003, the STB was faint...

Introduction

Amateurs have contributed to the observational record of Jupiter for years and years. The official reports of the British Astronomical Association go back at least 114 years, to 1891. Individual reports by amateurs can be traced back even further than that to 1869, and Rogers (1995) shows sketches as far back as 1831. The Association of Lunar and Planetary Observers can claim organized records beginning in 1947, the year the organization was formed and certainly individual A.L.P.O. members were...

The Vertical Structure of Jupiters Atmosphere

Unlike the physical or visual appearance of Jupiter where observations of changes in the longitudinal and latitudinal positions of features has long been an area in which amateurs have been able to participate, observations of Jupiter's vertical structure, at least at the time of this writing, have not. Indeed, even the ability of the professional astronomer to pierce deeply the cloud tops of Jupiter is still severely restricted, as we shall see. However, as amateurs we should seek to...

The Io Flux Tube and Magnetic Footprints on Jupiter

As we have discussed, Jupiter and its moon, Io, are strongly linked in an electromagnetic fashion. One of the examples of this connection is a phenomenon called the Io flux-tube. Io is electrically linked to Jupiter by a pair of flux-tubes that run down the magnetic field lines in Jupiter's polar regions 278 . The Io flux tube is a fascinating feature of Jupiter's electromagnetic environment and John Rogers explains it very well. According to Rogers, As the plasma-filled magnetic field sweeps...

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An image of Callisto by the Voyager 2 spacecraft. The surface of Callisto is the most heavily cratered of the Galilean moons. The bright areas are ejecta thrown out from relatively young impact craters. Credit NASA JPL Caltech presence of a salty subsurface ocean. A subsurface ocean with the salinity typical of Earth's oceans and a few kilometers thickness can easily produce the observed induction response. Perhaps the most spectacular result of these observations is that the...

Central Meridian Transit Timings

Of all the visual observing programs, the central meridian transit timing is the most valuable observation the amateur can make. The data produced by central meridian CM transit timings is extremely important to the professional community because, above all other amateur endeavors, it contributes to the understanding of Jovian wind currents, jet streams, and weather. Here, the amateur truly makes a meaningful contribution. When properly performed, CM transit timings result in data that provides...

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Resolution images, particularly those from the Galileo spacecraft, reveal craters with bright and dark ejecta in the darker regions Fig. 6.28 . The lighter grooved terrain is found to have parallel alternating grooves and ridges running for hundreds of kilometers. The troughs and crests of these are separated by 5-10 km horizontally and several hundred meters vertically. The grooves and ridges appear to be bundled into formations referred to as 'lineations'. These lineations can be seen in some...