In 1916, Norwegian researcher Kristian Birkeland was probably the first person to successfully predict that in the Solar Wind, "From a physical point of view it is most probable that solar rays are neither exclusively negative nor positive rays, but of both kinds"; in other words, the Solar Wind consists of both negative electrons and positive ions
qualche proprietà del vento solare sempre dallo stesso link Citazione:
In the heliosphere, the composition of the solar wind is identical to the Sun's corona: By mass, 73% ionized hydrogen and 25% doubly ionized helium with the remainder as trace impurities. These components are present as a plasma, consisting of about 95% singly ionized hydrogen, 4% doubly ionized helium, and less than 0.5% other ions (often called minor ions). The exact composition has been routinely measured on Ulysses and ACE, two spacecraft carrying a Solar Wind Ion Composition Spectrometer
Citazione:
Near Earth, the velocity of the solar wind varies from 200 to 889 km/s. The average is 450 km/s. Approximately 1×109 kg/s [1] of material is lost by the Sun as ejected solar wind, about one-fifth that lost due to fusion, which is equivalent to about 4.5 Tg (4.5×109 kg) of mass converted to energy every second. The total mass loss is equivalent to a lump of Earth-density rock about 125 m across every second, and at that rate the Sun would last for 10 million million (1×1013) years. However, our current understanding of star formation implies that the Sun's solar wind may have been about 1000 times more massive in the distant past, which would seriously affect the history of planetary atmospheres and that of the martian atmosphere in particular.
Citazione:
The plasma in the interplanetary medium is also responsible for the strength of the Sun's magnetic field at the orbit of the Earth being over 100 times greater than originally anticipated. If space were a vacuum, then the Sun's 10-4 tesla magnetic dipole field would reduce with the cube of the distance to about 10-11 tesla. But satellite observations show that it is about 100 times greater at around 10-9 tesla. Magnetohydrodynamic (MHD) theory predicts that the motion of a conducting fluid (e.g. the interplanetary medium) in a magnetic field, induces electric currents which in turn generates magnetic fields, and in this respect it behaves like a MHD dynamo.
Ok da quanto citato emerge qualcosa di interessante: che solamente 1/5 del vento solare può essere il prodotto di una fusione nucleare....e il resto? Come si generano tutte queste particelle cariche?
Non puoi inviare messaggi. Puoi vedere le discussioni. Non puoi rispondere. Non puoi modificare. Non puoi cancellare. Non puoi aggiungere sondaggi. Non puoi votare. Non puoi allegare files. Non puoi inviare messaggi senza approvazione.