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Warming On Jupiter, Mars, Pluto, Neptune's Moon & Earth Linked to Increased Solar Activity, Scientists Say
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Solar spin. Before we take a quick spin around the Solar System looking at these ideas, it is worth noting that the said system contains, in all, ten bodies with atmospheres thick enough to provide something we might call a climate. If these ten climates are all subject to a little natural variation, as the climate on Earth is, then finding that half of them are showing some warming at any given time is hardly surprising.
It is also worth noting that the Sun's radiance is measured from Earth orbit, and these records do not show it increasing over the past few decades, except with the regular rise and fall of the solar cycle. [ presumably the 11 year cycle]. This second fact, you might think, should be enough to scupper the theory about system-wide solar warming on its own; strangely it is notably absent from accounts of the matter.
Moving on to the particulars, in the cases of Pluto and Triton, Neptune's largest moon, the observed warming is due to their current orientation to and distance from the Sun — technically known as summer.
Pluto was closest to the Sun in 1989 and is now moving away, but it is still relatively close. It's not that surprising for the greatest warmth to come a little after the closest approach, any more than it is for afternoons to be warmer than noons. And Triton's orbit is giving its southern hemisphere a particularly hot summer, boiling off frozen material from the southern pole and thickening the atmosphere, keeping in even more heat.
On Jupiter, things are a little different. The patterns of circulation seem to be changing, such that heat at the equator is stuck there, and higher latitudes are getting a little cooler.
On Mars, the warming seems to be down to dust blowing around and uncovering big patches of black basaltic rock that heat up in the day (see 'Mars hots up'). No change in sunshine required.