xsas, on 19 February 2013 - 01:00 PM, said:
Hi Psyche,
Good to see you again, thanks for that.
I had read about the natural phenomena believed to be behind the fireballs but wasn't sure if these are seen all year round or just on the day of the full moon at the end of Buddhist Lent.
Am I correct in assuming, the fireballs are seen throughout the year at all times?
Gidday Mate
Pleasure to see you around again.
Yes, they are seen throughout the year, but are abundant around October, and vary from year to year, but most claims only go back to the 60's however, locals claim a far longer history. Some years there are heaps, some years hardly any, it is also not restricted to the Mekong, but the smaller surrounding lakes produce these as well. Hang on mate, I have a good link stashed here someplace, I had a look at them sometime ago when mcrom mentioned them in the ET section. Fascinating stuff.
Here it is

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LINK
I like this part, it is quite relevant:
Scientists get involved
Contrary to most other ghostly apparitions around the world, Naga fireballs have been observed by thousands of people and captured on numerous photographs and movies.
Most local people believe in the mythical explanation involving nagas. In 2002 there arised a scandal when independent Thai TV channel iTV reported that they observed the following: each time when Laotian soldiers shot some tracer bullets in the air, Thai side of river was greeting this with cheerful shouts. TV reporters thus proved that sometimes "fake" naga balls are greeted.
This report met with stiff resistance of local people expressing even hate towards iTV.
Government of Thailand decided that scientists should be involved and explanation should be provided. A kind of "dreamteam" of Thai experts was established, at the same time rising heated debates about the intrusion of science in traditional myths.
In 2003 thermal scanners and five teams of scientists were stationed in several spots along the river in Rattanawapi district (Thailand). A team was located also at the most famous observation spot - at the Naga temple in Phon Phisai town. There were rumours about the involvement of specific submarine in research.
Some scientific reports mention an upward movement of gas bubbles in Mekong water. According to them - as the gas bubbles reached the surface, the gas started to burn and rised up like a glowing orange bubble.
Phosphine? Methane?
Earlier some scientists considered that the most likely reason for flames is phosphine (PH3). This gas, especially in the presence of the diphosphine (P2H4), is capable of spontaneous flammability. Thus one can assume that bubbles of this substance may rise from the sediments of Mekong and, as it reaches the atmosphere, burn with yellow - orange flame. Small amount of this substance quickly is consumed in flames, and, as the burning bubble rises up in the air, it disappears.
Possible source of phosphine might be a chemical reaction in the river sediments - bacterial reduction of phosphate in decaying organic matter.
Often is mentioned another gas - methane, which, theoretically, if mixed with the same phosphine and some other gases at very specific conditions may experience spontaneous ignition.
...or hoax?
There remained unsolved issues though:- Phosphine is not a light gas, it is heavier than air. Naga lights though rise up in the air very quickly.
- When phosphine burns, it produces dense, white and highly toxic cloud. None of these effects (luckily) have been observed on Mekong.
Cheers.
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