In a paper recently published in the Journal of Glaciology, the IceCube Collaboration presents a study of South Pole climate over the past 100,000 years, using high-resolution 3D laser images of the ice sheet.
IceCube Current News
That’s IceCube winterover Ian Rees (facing) near the drill while it’s being prepared to access a rod well, which is a deep cavity used to melt ice for drinking water. Rod wells are named after Paul Rodriguez, an Army engineer who developed them while at Camp Century in Greenland in the early 1960s.
This austral summer, on November 4, Ian Rees was the first IceCuber to reach the Amundsen-Scott station, after a long trip from Boulder, Colorado. From now until the end of the IceCube polar season, 20 people will fly to the Pole from Madison, Maryland and Delaware in the US, but also from Canada, Germany, Sweden, and Belgium.
In a new study, the IceCube Collaboration searches for neutrino-induced particle showers in one year of data taken during the construction phase of IceCube, when about half the detector was operational. Above 100 TeV, a 2.7σ excess of events was found, which is consistent with results published by the IceCube Collaboration in Science. The current paper has been submitted to the journal Physical Review D.
Open coat? No hat? It must be summer at the South Pole. Well, although it’s sunny outside it would probably be a stretch to call it warm, for those of us not used to it anyway. Dag Larsen, one of IceCube’s two winterovers for this season, has finally arrived (above), and he may or may not be used to the cold, but one thing is sure—he has plenty of time to get used to it.
In an analysis published today, the IceCube Collaboration reports on a search for a diffuse astrophysical neutrino signal, looking at high-energy upward-going muon tracks, with data taken between May 2009 and May 2010, when the detector was running in its 59-string configuration. The search found a high-energy neutrino excess of 1.8σ compared to the background scenario of a pure conventional atmospheric model, a measurement consistent with the astrophysical neutrino flux described in Science. The results of this research have been submitted to Physical Review D.
The IceCube Neutrino Observatory is a demonstration of the power of the human passion for discovery, where scientific ingenuity meets technological innovation. Today, nearly 25 years after the pioneering idea of detecting neutrinos in ice, the IceCube Collaboration announces the observation of 28 very high-energy particle events that constitute the first solid evidence for astrophysical neutrinos from cosmic accelerators. Details of the research appear in an article published tomorrow, November 22, in Science.
Outgoing winterovers Felipe Pedreros (left) and Blaise Kuo Tiong (right) greet newcomer Ian Rees (center) on his arrival. Thanks to Felipe and Blaise for a great year of photos and reports, and welcome to Ian and Dag (Larsen, still to come), fresh and ready to capture the year’s adventure ahead.
It always seems as if they have just about everything at the South Pole, but apparently they didn’t have a unicycle. Until recently. Winter is officially over, and new arrivals to the station have come bearing goodies of all sorts, from “freshies” to toys—like this unicycle, which IceCube winterover Blaise is testing out in good form.
Life’s a tradeoff. At the South Pole, when winter comes to a close, you trade cold, dark, isolated for (still) cold, but bright, and less isolated. With the sun out, you also get sundogs—scientific name, parhelion. The tradeoff there? No more auroras for a while.
A few short weeks ago this scene would have looked quite different. But now the sun is out, full force, and the snow is bright white. The camera was apparently caught in a stare down with a Basler ski-plane that was stranded for a few days at the Pole due to bad weather.
The IceCube collaboration presents new results that rule out the possibility—at a confidence level greater than 90%—that the two PeV events detected in IceCube are cosmogenic neutrinos. However, the long exposure of the analyzed data, from May 2010 to May 2012, and the lack of detected events with higher energies, have allowed a new probe into the cosmogenic neutrino flux, which has been used to set the most stringent limit for the energy range from 1 PeV to 10 EeV. This analysis has just been submitted to the journal Physical Review D.
Greenery, and flowers, … this doesn’t look like much like the South Pole. But this photo was taken at an important place in the South Pole station—the greenhouse. If it weren’t for the greenhouse, they wouldn’t have any fresh vegetables during the long winter.
What do a rock, an egg, and a kiwi all have in common? They can all be found at the South Pole. Maybe not readily or easily, but they were all found at the South Pole recently. This rock was discovered outside on a snowdrift, a finding that spurred some scientific tests to examine the nature of the rock.
Now that looks like the sun—finally! It’s rising up over the flags at the ceremonial South Pole.
The sun is rising at the Pole, but this once-a-year occurrence is a much more gradual happening than the once-a-day occurrence most of us experience (or don’t, if we sleep through it, as the case may be). Here, increasing sunlight lets you clearly see the flag path leading to the Dark Sector.
There is little to no snowfall at the South Pole—it’s basically a desert. But there is a lot of snow on the ground. High winds carry the snow that does come down all over the place, leaving drifts that can bury equipment or even buildings.
Sky-watchers around the world were anticipating this close encounter of celestial objects last week. It was the conjunction of the moon and Venus, and the South Pole was a great place to capture a shot. Check out some other photos from the week—the conjunction, snow drifts, and glowing horizon. Nice scenery, whether you’re just watching the sky or launching balloons.
All appears to be tranquil, but there was more commotion than usual last week. A power outage occurred at the Pole that affected all the facilities at the station, including the IceCube Lab, or ICL (shown above).
In May 2013, the IceCube Collaboration elected Professor Olga Botner of Uppsala University, Sweden, as its new spokesperson, following a two-year service by Professor Greg Sullivan from the University of Maryland.
The sun has not officially risen at the Pole yet, but things do keep getting brighter. Outside that is. Inside? Well, maybe thoughts of the sun’s arrival led to thoughts of summer foods.
A new study by the IceCube Collaboration shows that the muon track reconstruction performed in the early stages of the analysis can be significantly improved by using robust statistical methods to estimate particle trajectories through the detector. The new algorithm results in a 13% gain in the angular resolution of the muon track and a 98% accuracy rate in determining the number of muons in coincident events. The paper has just been submitted to Nuclear Instruments and Methods in Physics Research Section A.
The yellow light cast on the ground makes the scene look almost like a sandy beach, with a shorefront edging into dark waters. But it’s just an illusion, we’re still at the Pole. That’s SPTR-2, one of the South Pole satellite domes.
Before there was IceCube, there was AMANDA, and before there was AMANDA, there were a couple people testing the idea for an in-ice neutrino detector in Greenland.
It’s still dark at the Pole these days, but knowing that the sunrise is not that far off, station staff are taking every opportunity to capture some great night photos.
A failed Acopian power supply is on the table for investigation. The IceCube winterovers have a broad range of job duties, but of course maintaining (and fixing if necessary) all of the computer hardware involved in collecting data from the detector is a high priority task.
Since December is a summer month in the Southern Hemisphere, many countries like Australia and New Zealand hold Christmas in July events in order to have a Christmas with a wintry feel. They were celebrating Christmas in July at the Pole last week, but of course their climate is always wintry so maybe it was just an excuse to bake some sweet treats.
The South Pole has been described as an otherworldly place. So it’s befitting for those working there to take a moment once in a while to just sit and contemplate their surroundings. Especially when there’s some natural light to see by—the moon can really light the place up.
A search for neutrino point sources using throughgoing muons in IceCube has not found any excess of neutrinos above the atmospheric background in any given direction in the sky. Neither did dedicated searches of a priori selected objects. However, IceCube data provide insights into the nature of cosmic ray sources even from non-discovery results. These results have been submitted today to The Astrophysical Journal.
Don’t let these bright lights in the South Pole station gym (nice facilities, huh?) confuse you—it’s dark down there. Winter at the Pole means six months with no sunlight at all.
Which to marvel at more—the dark, star-studded sky or the fantastic aurora shimmering up from all along the horizon? Being able to step outside and regularly witness these amazing light shows is definitely one of the perks of winterovering at the South Pole station.
The IceCube Collaboration publishes today a new measurement of the all-particle cosmic ray energy spectrum in the energy range from 1.6 PeV to 1.3 EeV using data from IceTop, the surface component of the IceCube Neutrino Observatory. The measured spectrum exhibits clear deviations from power law behavior. These resultshave just been submitted to Physical Review D.
They work hard, and they play hard. This week, play involved some billiards—the annual tournament is on. IceCube winterover Felipe is concentrating on his next move.
The IceCube Collaboration presents the results of a first search for self-annihilating dark matter in nearby galaxies and galaxy clusters. This analysis has been submitted today to Physical Review D.
Aya Ishihara recognized at ICRC 2013 by the International Union of Pure and Applied Physics for her discovery of two extremely high-energy neutrinos.
They’re halfway there! It’s midwinter at the South Pole, and they’re celebrating.
With nearly fifty presentations and posters, the IceCube Collaboration will contribute heavily to the International Cosmic Ray Conference (ICRC), which begins today in Rio de Janerio, Brazil.
It was the first winter open mic session and IceCube winterover Felipe was behind his drums and cymbals. They really do have everything down there, don't they?
Could they ever tire of viewing auroras at the Pole? Hmm, not sure. But regardless, they do have other things to do besides stare up at the sky. First, there’s work. Then, there are extracurricular activities. ...
A green sky flecked with swirling patterns of white lines. That’s what you get from sixty 30-second exposures taken through a ceiling dome at the South Pole station and made into a composite image. The IceCube winterovers have been capturing some amazing photos at the South Pole.
Antarctica is often described as the coldest, driest, and windiest place on earth. Cold and dry might be hard to discern from photos, but windy? These flags give it away—here, they’re taking a real beating. The group photo below (also with flags flapping away) was orchestrated to commemorate the invention of the Ethernet 40 years ago (they’re posing with a long Ethernet cable held between themselves). The photo garnered a response from the inventor himself, Bob Metcalfe, then at Xerox PARC.
A recent measurement of the Moon shadow in TeV cosmic rays with the IceCube telescope sets an upper limit on the detector’s absolute pointing accuracy to 0.2 degrees. The IceCube Collaboration presents these results in a paper submitted today to Physical Review D.
There was plenty of action this week at the Pole, indoors and out. Inside there was crocheting and a 5K race. Outside the auroras continued, bigger and brighter than ever.
The IceCube Neutrino Observatory, which comprises the IceCube and DeepCore detectors, has been designed to contribute heavily to our understanding of neutrino physics. In a paper submitted today to Physical Review Letters, the IceCube Collaboration has announced the first statistically significant detection of neutrino oscillations in the high-energy region (20–100 GeV).
The aurora season is in full swing at the South Pole, as exemplified by this photo taken of the ARO (Atmospheric Research Observatory) building, bathed in a green glow. ARO is an NSF facility that supports long-term climate research programs. The building is located about 500 m from the main station and, like other outlying buildings, has no running water or sewage system. Hmm, guess you’re not making ice cream out there. But, back at the station, it looks like the IceCube winterovers’ foray into ice cream making continues—flavor of the week: Aurora Green Tea with Fresh Lavender.
The Wisconsin IceCube Particle Astrophysics Center (WIPAC) is pleased to host the international IceCube Collaboration for the annual spring meeting May 07-11, 2013.
What’s this? Almost looks like a sample from the sushi plate (yep, we’ve already confirmed they eat well at the Pole) fell off outside and rolled around in the snow. But no, it’s yukimarimo. You heard right—a real word for a real thing—tiny, lightweight tumbleweeds of the Antarctic.
The auroras were busy this week, curling themselves up to look like cinnamon rolls. The IceCube winterovers were busy as well with several videoconferences, some with schools in the US and one with The Mind Museum in Manila. The photo below shows Blaise and Felipe (left to right) posing recently at the geographic South Pole (no, the pole marker is not bent, it’s just a wide-angle shot). There’s also a great shot of some sastrugi (we’ve learned about them before) pointing their way to the moon. Finally, check out this short time lapse video of an aurora unfolding above the moon—next best thing to being there.
Here they come. The auroras, that is. Although the sky is still allowing the sun’s presence to be somewhat felt from just below the horizon, it is also giving the winterovers their first glimpses of these special treats—from faint, wisping hints to full-on sprays of color.
This week had all the usual stuff—you know, calibrations, detector statistics, data handling, that kind of stuff. But it also had … Yuri’s Night. This is a global celebration held each April 12th to commemorate Yuri Gagarin, first man in space and an inspiration to many of the adventurous sort. The whole station observed the occasion with music and costumes.