What does PVO stand for?

Pioneer Venus Orbiter

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Samples in periodicals archive:

First detected by the Pioneer Venus Orbiter near the northern pole and recently by Venus Express orbiter around the southern pole, an S-shaped feature in the center of the vortices on Venus is also known to occur in Earth's tropical cyclones.

Earth cyclones may help explain vortices on Venus

In 1976, he was serving as a principal investigator on the Pioneer Venus Orbiter when a Harvard postdoctoral researcher asked him to help calculate the greenhouse effect of human-generated emissions on the Earth's atmosphere.

The Paul Revere of global warming

Exiting of Venus' ionosphere Data from various spacecraft, primarily the Pioneer Venus Orbiter, have identified "holes" in Venus' ionosphere, indicating regions with reduced numbers of hydrogen and oxygen ions.

Exiting ions of Venus' ionosphere

Pioneer Venus Orbiter spacecraft, which has been circling the planet since late 1978 but whose orbit has only recently risen enough to measure the shock wave where it directly faces the sun.

Venus: on the nose at last

Before and during ICE's encounter, attempts were also made to observe Giacobini-Zinner from at least three other spacecraft at widely differing locations: the International Untraviolet Explorer circling the earth, the Pioneer Venus Orbiter (PVO) around Venus, and the latest member of the fleet bound for Comet Halley, Japan's Planet A, launched on Aug.

First to a comet: 'a long, wonderful night'

However, he says, a detailed examination of the magnetic-field data from the Pioneer Venus orbiter shows a "signature' that would be difficult to explain without putting some sort of obstacle in the way-- like a comet or a cloud of ionized atoms that have "outgassed' from it.

Was it a comet, or merely the solar wind?