tag > Space
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The Richat Structure, called "Eye of the Sahara", is an eroded geological dome in the nation of Mauritania. Here pictured from the International Space Station as it orbited 256 miles above Africa. (Aug. 21, 2022)
Video of people visiting the structure, which has a diameter of 45 km and is only recognizable as round shape from space. Some speculate it is the site of The Lost Ancient City of Atlantis.
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Earth's Natural Radio: Strange sounds at VLF frequencies and below - NVARC Presentation by Philip J Erickson (W1PJE) (May 2022)
"I will provide an overview of natural emissions at very low electromagnetic frequencies in the VLF (3 - 30 kHz) and ULF (300 Hz - 3 kHz) ranges. These radio emissions are generated by physical phenomena, such as lightning discharges or interactions with plasma in the ionosphere, and in some cases are global in nature. They are also very interesting because their RF frequencies are primarily within human hearing range (although they are not acoustic waves!), and so heterodyne receiver architectures are not needed - making both receiver and transmitter design quite simple.
I will cover natural emissions, including audio samples, and describe what they tell us about the ionosphere and magnetosphere, including whistlers, chorus hiss, sferics, and more. Also covered will be human signals in this frequency range, such as power line harmonics and VLF communications signals used by almost every government for information transfer to submerged vessels. Some information will be provided as well on the challenges of receiving and transmitting signals in this range within your backyard, including the "Dreamer's Band" amateur frequencies below 9 kHz and the new "EbNaut" digital mode for this frequency range."
About Philip J Erickson
I am an associate director and head of the Atmospheric and Geospace Sciences group at Haystack Observatory, operated by Massachusetts Institute of Technology (MIT). Haystack is located approximately 42 km as the crow flies from the main MIT campus on a 1300 acre parcel overlapping the towns of Westford, Groton, and Tyngsboro, MA (grid FN42go). Since the late 1950s, Haystack has conducted frontier remote sensing research into the properties of the near-Earth space environment, including the ionosphere, neutral atmosphere, overlying plasmasphere, and the magnetosphere that surrounds our planet.I am a member of Nashoba Valley Amateur Radio Club (NVARC), a physical as well as spectral neighbor of Haystack. Outreach programs and activities are ongoing between Haystack and NVARC; see the NVARC page for details. I am also a member of the HamSCI citizen science initiative.
The talks Q&A section has interesting tid bits about the true complexities of climate change and the modeling of it: https://youtu.be/8J2zYgGIsno?t=4032 - https://youtu.be/8J2zYgGIsno?t=4235
Tools: http://www.abelian.org/ - http://websdr.org/ - http://www.vlf.it/ - https://theinspireproject.org/
Related Talk: Giant Antennas of the Navy! NVARC Presentation - by George Allison, K1IG
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China finds recent water flows on Mars, with big implications for alien life - China’s Zhurong rover found geologically recent water on Mars, billions of years after it should have been gone.
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The Most Famous Paradox in Physics Nears Its End
In a landmark series of calculations, physicists have proved that black holes can shed information, which seems impossible by definition. The work appears to resolve a paradox that Stephen Hawking first described five decades ago. Growing evidence supports what physicists have long suspected: In some way or other, space-time itself seems to fall apart at a black hole, implying that space-time is not the root level of reality, but an emergent structure from something deeper.
At Long Last, Mathematical Proof That Black Holes Are Stable
The solutions to Einstein’s equations that describe a spinning black hole won’t blow up, even when poked or prodded.
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Earth records its shortest day ever - Phenomenon known as the 'Chandler Wobble' may be having an impact on the speed at which the planet is rotating, say experts.
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Here be dragons
The current excitement around Artificial Intelligence and Machine Learning is mostly missing the bigger picture: There is a ghost in the machine and a machine inside the ghost. This century won't be predominately defined by AGI, Robotics or Biotech - but by breakthroughs in inter-species comms and the democratization (and rebranding) of energy work, practical magic & engineered paranormal activity.
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Aliens 👽
- Amino acids found in asteroid samples collected by Japan's Hayabusa2 probe
- China’s radio telescope detects first persistently active repeating fast radio burst from 3b light years away
- 4 hostile alien civilizations may lurk in the Milky Way, a new study suggests
- Aliens ‘could be common’ on planets orbiting stars similar to our sun, new study says
