Electromagnetism news

Birkeland Currents

Laurence also sent in the link https://watchers.news/2017/03/23/birkeland-currents-stronger-in-the-nort... ... which is another discovery by ESAs Swarm Mission. It has discovered a seasonal variation of Birkeland currents - strong electrical currents in the upper atmosphere (which is not the same in the north and south polar regions).


   At https://tallbloke.wordpress.com/2017/04/21/when-swarm-met-steve/ ... Swarm is a group of satellites designed to study the Sun, the solar wind, and so on. This includes looking at the aurora caused by the solar wind inter-acting with the Earth's magnetic shield. Steve is a name applied to a specific feature of the aurora - see the image above. Steve is a ribbon of purple light. It was almost unknown until the age of satellites, 20 years ago.

Ionosphere of Mars

At https://phys.org/print411059802.html ... it seems that NASAs MAVEN spacecraft has detected metal ions in the atmosphere of Mars - which shows that the ionosphere of Mars is electrically charged. MAVEN is exploring the atmosphere of Mars for clues as to why it is so thin (in comparison to the Earth and Venus). It is assumed it once had a more dense atmosphere - which has been lost.

Transient Events in History

At https://phys.org/print410606948.html ... researchers from Kyoto University and Japan's National Institute of Solar Research have used historical records to garner a better insight into the patterns of past solar events and their impact on the earth (such as intense aurorae). Japanese and Chinese documents (no mention of Korean examples of a similar nature) have enabled them to reconstruct a chronology. The study is published in 'Space Weather' (April 2017). For example, an early Japanese record of aurora sightings describes a prolonged event in AD1204.

Rossby Waves

At https://tallbloke.wordpress.com/2017/04/02/waves-on-sun-give-nasa-new-in... ... discusses what might cause coronal mass ejections from the Sun - as they contribute to space weather. See also www.sciencedaily.com/releases/2017/03/170330142242.htm ... where research finds a commonality between weather on earth and space weather. On earth weather appears to react to changes in the jet streams which blow air in narrow currents around the world - somewhat like Rossby waves, movements fueled by the planet's rotation.

Sun, Weather and Climate

The book, 'Sun, Weather, and Climate' (2005) by John R Herman and Richard A Goldberg is a reprint of a book originally published in 1978. It was reprinted on two occasions and published in Russian and Chinese, and seems to have become a classic of its kind, a forerunner of modern climate research. It is of great interest in the study of Earth's climate - hence the need to flag it up again (as I had a post in 2013 on the same book). William provided the link below.

Sat Nav and Aurorae

At https://tallbloke.wordpress.com/2017/03/15/auroras-affect-sat-nav-system... ... This is an interesting one as aurora are produced when gas particles in the Earth's atmosphere collide with charged particles emitted from the Sun. The resulting plasma turbulence has long been thought to be the reason why global navigation satellite systems go awry. New research casts doubt on this view.

Meteors Humming

Gary sent in this link - www.dailymail.co.uk/sciencetech/article-4201328/Study-identifies-cause-s... ... on the day after Wikipedia banned the Daily Mail claiming it was a source of fake news. You may wonder why Wikipedia, also renowned as a source of fake news, would bother - but you have to take into account the thought police that patrol the pages of Wikipedia (looking out for anti-CAGW postings).The David Rose 'bombshell article' has really rattled the gilded cage of the CAGW faithful. 

Mid Holocene Anomaly

At https://phys.org/print405675862.html ... we learn there was what is thought to be advanced solar activity smack bang in the middle of the Mid Holocene Warm Period. The evidence comes from tree rings in long lived bristlecone pine trees. The researchers suggest it may involve a change in the Sun's magnetic activity (a super flare) or a number of solar flares arriving in a burst, one after the other.