Illuminating Hessdalen

In his wonderful poem/performance piece Storm, Tim Minchin said: "Throughout history, every mystery ever solved has turned out to be 'not magic'."

As I've pointed out many times here before, it's not that I'm saying any of the thus-far-classified-as "out there beliefs" are impossible; it's that if they actually do exist, they should be accessible to scientific inquiry.  Auras, qi, chakras?  Demonstrate they're detectable by something other than a subjective viewer.  Hauntings?  Ditto.  Cryptids of various shapes and descriptions?  Give me something analyzable other than blurry photos and anecdotal eyewitness accounts.  Psychic abilities?  Show they work under controlled conditions.  

Interestingly, there was just an article in The Skeptic asserting that parapsychology has grown to the point that it deserves the title of science rather than pseudoscience.  I'm sure that the author, Chris French, professor of psychology at the University of London, will receive some blowback from this essay, as will The Skeptic in general for publishing it; but I agree with his central thesis, which is that parapsychological claims stand and fall on exactly the same basis as scientific claims do -- evidence.

And, as Minchin says, if a supernatural explanation turns out to be scientifically demonstrable, then it's no longer supernatural, is it?  It's just natural.  After that, it can be studied by the methods of science, just like every other feature of our weird, wonderful, amazingly complex universe.

What brings this up is a recent paper in Meteorology and Atmospheric Physics that considered the odd phenomenon of the "Hessdalen Lights" which occurs in a valley in central Norway, wherein people report seeing free-floating balls of light.  I'd written about the Hessdalen Lights (and various other accounts of lights in the sky) back in 2017, and described it as follows:

The Hessdalen Lights have been seen since the 1940s in the valley of Hessdalen in Norway.  They're stationary, bright white or yellow lights, floating above the ground, sometimes remaining visible for over an hour.  With such a cooperative phenomenon, you would think it would be easily explained; but despite the efforts of scientists, who have been studying the Hessdalen Lights for decades, there is yet to be a convincing explanation.  Hypotheses abound: that it is the combustion of dust from the valley floor; that it is a stable plasma, ionized by the decay of radon from minerals in the valley; or even that it is an electrical discharge from piezoelectric compression of quartz crystals in the underlying rock.  None of these is completely convincing, and the Hessdalen Lights remain one of the most puzzling natural phenomena I know of.

The lack of a convincing explanation opens the door to all sorts of wild speculation, and those abound -- ghosts, aliens, portals in time and space, you name it.  

Photograph of the Hessdalen Lights

As usual, my fallback position was, "I may not know what the scientific explanation is, but I'm certain that one exists."  Given how many times this phenomenon has been reported and photographed, it seemed pretty likely that it wasn't a hoax, or even misattributing it to something purely prosaic (like Neil deGrasse Tyson's story of a cop who was driving down a winding country road, chasing a "weird light in the sky" -- which turned out to be the planet Venus).  So accepting that the Hessdalen Lights actually occur as advertised, what the hell are they?

Much was my delight when I ran across the recent paper, by atmospheric chemist Gerson Paiva of Federal University Pernambuco (Brazil), which seems to have solved the mystery, using...

... wait for it...

... science.

Here's what Paiva writes:

Hessdalen lights are unusual, free-floating light balls presenting different shapes and light colors, observed in the Hessdalen valley in rural central Norway.  In this work, it is shown that these ghostly light balls are produced by an electrically active inversion layer above Hessdalen valley during geomagnetic storms.  Puzzling geometric shapes and energy content observed in the HL phenomenon may be explained through a little-known solution of Maxwell’s equations to electric (and magnetic) field lines: they can form loops in a finite space...  “Natural battery”, aerosols and global atmospheric electric circuits may play a crucial role for the electrification of the temperature inversion layers.

Now, I hasten to add that I don't know if Paiva's explanation is right.  But that's the other great thing about science; it's falsifiable.  When a researcher publishes something like this, it's immediately analyzed and taken to pieces by other experts in the field.  Unlike us fiction writers, who basically want everyone to read our writing and tell us how awesome it is, scientists are looking for rigorous criticism; they want their colleagues to try to tear it down, to see if their analysis is robust enough to withstand attempts to refute it.  So time will tell if Paiva has found the answer to this enduring mystery of atmospheric science.

But even if he hasn't, I'd bet cold hard cash that like Tim Minchin said, the answer will still turn out to be "not magic."

**************************************

Mathematics tends to sort people into two categories -- those who revel in it and those who detest it.  I lucked out in college to have a phenomenal calculus teacher who instilled in me a love for math that I still have today, and even though I'm far from an expert mathematician, I truly enjoy considering some of the abstruse corners of the theory of numbers.

One of the weirdest of all of the mathematical discoveries is Euler's Equation, which links five of the most important and well-known numbers -- π (the ratio between a circle's circumference and its diameter), e (the root of the natural logarithms), i (the square root of -1, and the foundation of the theory of imaginary and complex numbers), 1, and 0.  

They're related as follows:

Figuring this out took a genius like Leonhard Euler to figure out, and its implications are profound.  Nobel-Prize-winning physicist Richard Feynman called it "the most remarkable formula in mathematics;" nineteenth-century Harvard University professor of mathematics Benjamin Peirce said about Euler's Equation, "it is absolutely paradoxical; we cannot understand it, and we don't know what it means, but we have proved it, and therefore we know it must be the truth."

Since Peirce's time mathematicians have gone a long way into probing the depths of this bizarre equation, and that voyage is the subject of David Stipp's wonderful book A Most Elegant Equation: Euler's Formula and the Beauty of Mathematics.  It's fascinating reading for anyone who, like me, is intrigued by the odd properties of numbers, and Stipp has made the intricacies of Euler's Equation accessible to the layperson.  When I first learned about this strange relationship between five well-known numbers when I was in calculus class, my first reaction was, "How the hell can that be true?"  If you'd like the answer to that question -- and a lot of others along the way -- you'll love Stipp's book.

[Note: if you purchase this book using the image/link below, part of the proceeds goes to support Skeptophilia!]

I saw the light

We are currently in the middle of an early nor'easter, which is supposed to bring rain, wind, lightning, and thunder to us well into midday, which is probably why I was thinking this morning about the subject of Lights in the Sky.

The topic had also come up a few days ago in a conversation with a student, a young man who shares my skeptical outlook.  He showed me a video montage he'd found on YouTube of recent UFO sightings, and laughingly described a conversation he'd had with a friend who evidently liked the "alien spacecraft" hypothesis so much that he needed some reminding of what the "U" in "UFO" stands for.  In any case, I decided to do a little research regarding mysterious lights.

[image courtesy of photographer Andy Pham and the Wikimedia Commons]

Now, allow me to state up front that although several of these are as-yet unexplained, I strongly believe that they all have perfectly natural explanations.  The rush to blame any odd phenomenon on the paranormal is a tendency I've blogged about before, and I wouldn't want anyone to interpret my love of a mystery as an unwarranted attribution of these occurrences to ghosts, demons, or Little Green Men.

That disclaimer made, here are a few examples of odd light phenomena that I found out about.  I've included links for each of them that you should peruse if you want more information.

The Hessdalen Light has been seen since the 1940s in the valley of Hessdalen in Norway. It's a stationary, bright white or yellow light, floating above the ground, sometimes remaining visible for over an hour. With such a cooperative phenomenon, you would think it would be easily explained; but despite the efforts of scientists, who have been studying the Hessdalen Light for decades, there is yet to be a convincing explanation.  Hypotheses abound: that it is the combustion of dust from the valley floor; that it is a stable plasma, ionized by the decay of radon from minerals in the valley; or even that it is an electrical discharge from piezoelectric compression of quartz crystals in the underlying rock.  None of these is completely convincing, and the Hessdalen Light remains one of the most puzzling natural phenomena I know of.

Similarly peculiar are the Brown Mountain Lights, near Brown Mountain in the Pisgah National Forest of North Carolina.  These brightly-colored lights have been seen since the early 20th century, usually hovering near the horizon, and skeptics have claimed that they are the headlights of a train or automobiles, as there is a highway and a train track fairly near to the site where the lights are most often seen.  However, when a flood washed out the train overpass and rendered the highway impassable, the lights continued to be seen.  They're still seen today, apparently most commonly between September and November.

Likely to be a combination of lights from a highway and an atmospheric condition are the Paulding Lights, of Paulding, on the Upper Peninsula of Michigan.  This phenomenon is the subject of a variety of YouTube videos (search for "Paulding Lights" and you'll find a bunch), and in fact became the topic of an episode of Fact or Faked: The Paranormal Files on the Syfy Channel.  The FOF people, as you might predict, concluded that it was "unexplained."  However, after doing some digging myself, I found that researchers had concluded that the mysterious lights seen near Paulding were due to automobile headlights refracting through an inversion layer -- a layer of cool air near the ground bounded by warmer air above.  So I will respectfully disagree with the investigators on FOF and place this one in the file labeled "Probably Solved."

The Gurdon Light, of Gurdon, Arkansas, is one that has a lot of supernatural folklore attached to it.   It's a bobbing light seen in a wooded area near railroad tracks, and the legend is that it is a lantern held by a ghostly man who had been killed by a train.  Needless to say, I'm not buying that, and the information I found indicates that this one is fairly poorly documented -- leading me to surmise that it can be explained by nothing more than the overactive imagination of the superstitious.  Nonetheless, Gurdon remains a popular destination -- on Halloween.

Lastly, we return to Norway for what is in my opinion the best documented of these occurrences -- the Norwegian Spiral Anomaly of 2009.  (Do check out this link, which has excellent photographs and video of this strange and beautiful phenomenon.)  On the 9th of December in 2009, thousands of people all over central Norway took photographs and video footage of a spiral light in the sky, with a blue-green filament coming from its center, that opened up into a black hole.  Naturally, there was a rush to explain it as visitation by aliens, or as a physics experiment gone very wrong that had resulted in the formation of an actual black hole.  A more conventional explanation -- that it was a spiral vapor trail left by a failed flight of a Russian Bulava missile -- is only partially convincing; there was a missile test that day, and simulations of the pattern made by the ignited fuel from a spinning missile did form a spiral pattern, but the Spiral Anomaly looked essentially the same from all observation points, and this would not be true if it had been a missile vapor trail (some people would have seen it center-on, others from the side, etc.).  In my mind, it's still a mystery, and remains one of the most recorded, and most perplexing, light phenomena I've ever heard of.

So, there you have it; some reasons to keep your eye on the sky.  And even if I'm in no rush to attribute any of these to spirits or alien spacecraft, I have to admit that they are intriguing.  And there's something in all of us that loves a good mystery, isn't there?