Solar Cycle 25
Above: Layers of the atmosphere. Credit: NASA
by DR.TONY PHILLIPS – spaceweather.com
The sun is entering one of the deepest Solar Minima of the Space Age. Sunspots have been absent for most of 2018, and the sun’s ultraviolet output has sharply dropped. New research shows that Earth’s upper atmosphere is responding.
“We see a cooling trend,” says Martin Mlynczak of NASA’s Langley Research Center. “High above Earth’s surface, near the edge of space, our atmosphere is losing heat energy. If current trends continue, it could soon set a Space Age record for cold.”
These results come from the SABER instrument onboard NASA’s TIMED satellite. SABER monitors infrared emissions from carbon dioxide (CO2) and nitric oxide (NO), two substances that play a key role in the energy balance of air 100 to 300 kilometers above our planet’s surface. By measuring the infrared glow of these molecules, SABER can assess the thermal state of gas at the very top of the atmosphere–a layer researchers call “the thermosphere.”
“The thermosphere always cools off during Solar Minimum. It’s one of the most important ways the solar cycle affects our planet,” explains Mlynczak, who is the associate principal investigator for SABER.
When the thermosphere cools, it shrinks, literally decreasing the radius of Earth’s atmosphere. This shrinkage decreases aerodynamic drag on satellites in low-Earth orbit, extending their lifetimes. That’s the good news. The bad news is, it also delays the natural decay of space junk, resulting in a more cluttered environment around Earth……READ FULL ARTICLE
Donald de Riggs, J88CD, on the Caribbean island of St. Vincent, says that on April 13, the 42nd anniversary of the 1979 eruption of the La Soufriere volcano, island residents were awakened to another column of volcanic ash creating a thick... Read more
KC901S is a “RF multimeter”. It supports the analysis of single port vector network analysis and dual port scalar network analysis,... Read more
Cushcraft The Cushcraft R6000 is a 6 through 20 meter, no ground radial antenna. It includes manyof the features of the R8, R7 and R5 antennas.... Read more
BaoFeng DM-5R PLUS Transceiver Compatible with Motorola VHF/UHF 136-174/400-480Mhz 2000mAH High Capacity Battery High Power/Low power Repeater Mode Ti... Read more
Great news for digitally connect hams in the great Toronto area! Today, VA3XPR launches an all-digital repeater using Yaesu’s System Fusion C4FM FDMA... Read more
PRESS RELEASE Qixiang Electron Science & Technology Co., Ltd was founded in January 1993, and is locate in Quanzhou in China. Qixiang is a high-te... Read more
Icom are pleased to announce details of the new IC-2730E dual band mobile transceiver which will be available in early 2015. This stunning new... Read more
Anytone TERMN-8R THE FIRST RADIO FOR AMATEUR, COMMERCIAL, AND PUBLIC USEThe most versatile two way radio on the market, certified for use for commerci... Read more