A relatively rare astronomical event will take place on Monday, November 11, with the passage of Mercury directly in front of the sun. The jet black and perfectly round Mercury will glide slowly across the solar disk and - given the right sky conditions and a properly safely-filtered telescope - it will be visible in all continents except Australia. The next transit of Mercury won’t take place until 2032. Warning! Do not stare at the sun during transit.
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The sun continues to be very quiet and it has been without sunspots on 200 days during 2019 or 72% of the time which is the highest percentage since 2009. We have entered into a solar minimum phase of the solar cycle and sunspot counts suggest this could turn out to be the deepest of the past century. Low solar activity has been well correlated with an atmospheric phenomenon known as “high-latitude blocking” and this could play an important role in the upcoming winter season; especially, across the eastern US. In addition, one of the natural impacts of decreasing solar activity is the weakening of the ambient solar wind and its magnetic field which, in turn, allows more cosmic rays to penetrate the solar system. The intensification of cosmic rays can have important consequences on such things as Earth’s cloud cover and climate, the safety of air travelers, and as a possible trigger mechanism for lightning.
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The sun continues to be very quiet and it has been without sunspots this year 69% of the time as we approach what is likely to be one of the deepest solar minimums in a long, long time. In fact, all indications are that the upcoming solar minimum may be even quieter than the last one which was the deepest in nearly a century. In addition, there are now forecasts that the next solar cycle, #25, will be the weakest in more than 200 years. Even weak solar cycles, however, can produce significant solar storms. In fact, it was this same time of year back in 1859 when a super solar storm - now known as the “Carrington Event” - took place during another weak solar cycle (#10). The event has been named for the British astronomer, Richard Carrington, as he observed from his own private observatory the largest solar flare which caused a major coronal mass ejection (CME) to travel directly toward Earth. Fortunately, solar storms of this magnitude are quite rare as it would very likely have a much more damaging impact on today’s world than it did in the 19th century.
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The annual Perseid meteor shower is well underway and will reach a peak early next week (Monday 8/12 -Tuesday 8/13). The viewing at the peak time this year will be troubled by moonlight from a nearly full moon. However, the upcoming weekend could offer pretty favorable conditions as nighttime skies should be mainly clear in the Mid-Atlantic region and the moonlight interference will be less of an issue. The Perseid meteor shower comes every August as the Earth passes through a cloud of dust that comes from Comet Swift-Tuttle as it approaches the sun.
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It’s been 50 years since Apollo 11 landed on the moon, and Neil Armstrong and Buzz Aldrin became the first people to walk on its surface. There were 5 subsequent Apollo missions that successfully landed humans on the moon and brought them safely back to Earth. What kind of “weather” did these astronauts need to contend with on the moon? The moon has a very thin atmosphere so it cannot trap heat or insulate the surface. There is no wind there, no clouds, no rain, no snow and no storms, but there is “day and night” and there are extreme differences in temperatures depending on where the sun is shining.
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The Moon is home to one of the largest known impact craters in the solar system known as the Lunar South Pole-Aitken Basin, but because it is located on the far side of the moon, it cannot be viewed directly from Earth. At 2,500 kilometers (1,550 miles) across, the South Pole-Aitken Basin covers nearly a quarter of the lunar surface - and there's something massive buried beneath it. Detailed readings made using lunar orbiters indicate there is something huge enough under that crater to be causing a significant gravitational anomaly. Researchers say it could be a huge lump of metal from the asteroid that formed the South Pole-Aitken Basin. Instead of sinking down into the moon's interior, it remained buried in the moon's mantle. Computer simulations suggest that this is a plausible explanation, but other explanations have also been proposed.
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The sun continues to be very quiet and it has been without sunspots this year 62% of the time as we approach what is likely to be one of the deepest solar minimums in a long, long time. In fact, all indications are that the upcoming solar minimum may be even quieter than the last one which was the deepest in nearly a century. In addition, there are now forecasts that the next solar cycle, #25, will be the weakest in more than 200 years. The current solar cycle, #24, has been the weakest with the fewest sunspots since solar cycle 14 peaked in February 1906. Solar cycle 24 continues a recent trend of weakening solar cycles which began with solar cycle 21 that peaked around 1980 and if the latest forecasts are correct, that trend will continue for at least another decade or so.
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Noctilucent clouds are the highest clouds on Earth and are quite rarely seen in the US as they are primarily visible at high latitudes above +55°N. This weekend, however, noctilucent clouds were seen across many spots in the US including as far south as Freedom, Oklahoma (+36°N) which according to spaceweather.com, may be the lowest latitude sighting ever. Research studies have shown that these clouds tend to become more prevalent during solar minimums and we are now entering into what is likely to be a deep and perhaps historic solar minimum.
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It was during the height of the Cold War and a powerful solar storm could have led to a disastrous military conflict between the US and Soviet Union if not for the early efforts of the US Air Force to monitor solar activity. On May 23rd, 1967, a solar storm took place that was so powerful, it jammed radar and radio communications in polar regions and the US Air Force actually began to prepare aircraft for war thinking the nation’s surveillance radars were being jammed by the Soviet Union. Fortunately, space weather forecasters in the military suspected there might be another cause and they relayed information about the possibility that a solar storm could have been the reason for the disrupted radar and radio communications. As it turned out, this information was enough to keep the planes on the ground and the US avoided a potential nuclear weapon exchange with the Soviet Union.
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The sun continues to be very quiet and it has been without sunspots this year more than half the time as we approach what is likely to be a deep solar minimum. In fact, all indications are that the upcoming solar minimum which is expected to begin later this year may be even quieter than the last one which was the deepest in nearly a century. Solar cycle 24 has been the weakest sunspot cycle with the fewest sunspots since cycle 14 peaked in February 1906. Solar cycle 24 continues a recent trend of weakening solar cycles which began with solar cycle 21 that peaked around 1980. The last time the sun was this blank in a given year on a percentage basis was 2009 during the last solar minimum when 71% of the time was spotless. That last solar minimum actually reached a nadir in 2008 when an astounding 73% of the year featured a spotless sun - the most spotless days in a given year since 1913. One of the natural impacts of decreasing solar activity is the weakening of the ambient solar wind and its magnetic field which, in turn, allows more and more cosmic rays to penetrate the solar system. The intensification of cosmic rays can have important consequences on such things as Earth’s cloud cover and climate, the safety of air travelers and as a possible trigger mechanism for lightning.
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