The solstice occurs today at 8:56 PM Eastern Standard Time. At the solstice the sun reaches [
http://www.nsta.org…] its most southerly position in the sky [
http://www.archaeoa…] and winter begins for the Northern Hemisphere while summer starts South of the Equator. This false-color image of the sun was made [
http://www.lmsal.co…] about 48 hours before the solstice in the light of soft (lower energy) X-rays by a telescope on board the space-based Yohkho solar observatory [
http://www.solar.is…]. The normally bright, visible solar surface or photosphere appears dark in X-ray light while active regions in the solar corona [
http://www.lmsal.co…] which lie above the photosphere are particularly X-ray bright. Solar photospheric temperatures are about 6,000 degrees C. but the X-ray bright coronal regions have temperatures of millions of degrees. Why is the sun's corona so hot [
http://www.lmsal.co…]?
Explanation
The solstice occurs today at 8:56 PM Eastern Standard Time. At the solstice the sun reaches [
http://www.nsta.org…] its most southerly position in the sky [
http://www.archaeoa…] and winter begins for the Northern Hemisphere while summer starts South of the Equator. This false-color image of the sun was made [
http://www.lmsal.co…] about 48 hours before the solstice in the light of soft (lower energy) X-rays by a telescope on board the space-based Yohkho solar observatory [
http://www.solar.is…]. The normally bright, visible solar surface or photosphere appears dark in X-ray light while active regions in the solar corona [
http://www.lmsal.co…] which lie above the photosphere are particularly X-ray bright. Solar photospheric temperatures are about 6,000 degrees C. but the X-ray bright coronal regions have temperatures of millions of degrees. Why is the sun's corona so hot [
http://www.lmsal.co…]?
Explanation
