I recently returned from Lijiang (in Yunnan, China). One of my legs was a flight from Chengdu to Beijing, and it is certainly a flight I will never forget.
Here is a summary of the northern lights I have seen.
If you check the dates, you'll notice that I am utterly delinquent with respect to posting at this site. Unfortunately, it is because I have an administrative post - I am chairman of the faculty union at the Hebrew University. And it really takes up precious time, which otherwise, would have allowed me to write.
One of the phenomena appears to be that of open-cell convection, i.e., air rising (and precipitating) on the cell boundaries.
Since it is not in my habit of just regurgitating stuff I see on the internet, here is my added value. How can one estimate the quadrupole gravitational radiation of a binary? How close does the binary have to be for it to coalesce within the age of the universe?
On Sunday last week, a global warming debate was held at the Hebrew University, in front of a large public audience. The speakers included myself, and Prof. Nathan Paldor from the HU, on the so called sceptic side, and Prof. Dan Yakir (Weizmann) and Prof. Colin Price (Tel-Aviv Univ.) on the anthropogenic greenhouse gas (AGHG) side.
You can watch the debate, in Hebrew at the Authority for Community and Youth of the Hebrew University. Since most of the readers are not from Israel (98% of the visitors to sciencebits.com), here is a short synopsis. It is followed by a detailed response to the claims raised against the cosmic ray climate link.
התחממות גלובלית, מי יודע מדוע וכמה? A short "open letter" in hebrew about global warming. To all my english readers, sorry. This is a one time quirk.