Autres sites en relation avec
tache solaire
Sunspots
Sunspots are places on the Sun that are cooler than the rest of the Sun's surface. The National Geophysical Data Center (NGDC) of the National Oceanic and Atmospheric Administration (NOAA) has more information on sunspot numbers.
URL : http://www.athena.ivv.nasa.gov/curric/space/sun/sunspot.html
Royal Greenwich Observatory/USAF/NOAA Sunspot Record 1874-1999
Sunspots are magnetic regions on the Sun with magnetic field strengths thousands of times stronger than the Earth's magnetic field. The Royal Greenwich Observatory (RGO) compiled sunspot observations from a small network of observatories.
URL : http://wwwssl.msfc.nasa.gov/ssl/pad/solar/greenwch.htm
Sunspot activity is on the rise
Oct. 19, 1998: Scientists at NASA's Marshall Space Flight Center appear to have done a good job of predicting Cycle 23 of the sunspot cycle. Credit: NASA/Marshall Space Flight Center and the Hiraiso Solar Terrestrial Research Center /CRL (Japan).
URL : http://es91-server1.msfc.nasa.gov/newhome/headlines/ast19oct98_1.htm
Cosmic and Heliospheric Learning Center -- Solar Activity - Sunspots
The electric currents in the Sun, as well as in planets and galaxies, generate magnetic fields. Sunspots, temporary disturbances in the Sun's photosphere, are the most visible advertisement of the solar magnetic field.
URL : http://helios.gsfc.nasa.gov/sspot.html
© Anaconda-//, 1999
last revised: December 27, 1999
Copyright : Anaconda-//, 1999