My greetings, dear readers:
I'd want to tell that the Sun is the source out of which our lives have sprung up, hence the name of this blog. As you know, everything is made up of atoms and atoms contain protons, neutrons and electrons. Where do all these subatomic particles come from? Nothing more, nothing less than from the Sun. So, somehow, we're made up of the same material that the Sun.
domingo, 13 de mayo de 2012
miércoles, 9 de mayo de 2012
Solar Storms
A solar storm (more commonly known as solar flares) is a violent explosion in the photosphere of the Sun whose energy is equivalent to millions of hydrogen bombs. Solar flares take place in the corona and chromosphere, heating plasma to tens of millions of kelvins and accelerating electrons, protons, etc.. resulting in nearly the speed of light. These eruptions produce electromagnetic radiation at all wavelengths of the electromagnetic spectrum, from long radio waves to the shortest gamma rays. Most flares occur around sunspots, where intense magnetic fields emerge from the Sun's surface to the corona. The energy associated with solar flares could take hours or days to build. However, most of the eruptions take just a few minutes to release their energy.Solar flares were first observed in 1859. The frequency of these events varies, several eruptions a day when the Sun is particularly "active", less within a week when "quiet"... Solar activity varies over a 11-year cycle, called the solar cycle. At the peak of the cycle there are, usually, more sunspots, and hence more solar flares.
Solar flares are associated with coronal mass ejections (CME), which strongly influence our local solar meteorology. They produce energetic particle fluxes in the solar wind and Earth's magnetosphere that can present really dangerous radiation to astronauts and spacecrafts. The X-ray flux of some flares increases the ionization of the upper atmosphere, and this can interfere with radio communications on shortwave, and increase friction with low orbiting satellites, which leads to orbital decay. The presence of these energetic particles in the magnetosphere contribute to the aurora borealis and aurora australis.At the left: Layers of the sun. Solar flares occur
when plasma is heated in the corona
and the chromosphere.
References:
Wikipedia: http://en.wikipedia.org/wiki/Solar_flare
Google images: https://www.google.es/search?tbm=isch&hl=es&source=hp&biw=983&bih=554&q=erupciones+solares&gbv=2&oq=erupciones+solares&aq=f&aqi=g5g-S5&aql=&gs_l=img.3..0l5j0i24l5.4016.11735.0.15532.18.14.0.2.2.1.672.3094.2-2j3j1j2.8.0...0.0.1OPD6hVjjeM&safe=active
lunes, 7 de mayo de 2012
Electricity on Earth
Atmospheric electricity is the diurnal variation of atmospheric electromagnetic network (or, more generally, any electrical system in the atmosphere of a planet). The surface of the Earth, the ionosphere, and atmosphere are known as the "global atmospheric electric circuit." Atmospheric electricity is a multidisciplinary subject.
There is always free electricity in the air and clouds, which acts by induction on Earth and electromagnetic devices. Experiments have shown that there is always free electricity in the atmosphere, sometimes negative and sometimes positive (most of the time generally positive)and the intensity of free electricity is higher than in the morning noon or night and is higher in winter than in summer. In good weather, the potential increases with altitude at a rate of about 100 volts per meter.
Different layers or strata of the atmosphere, situated at very short distance from each other, are often found in different electrical state. The phenomena of atmospheric electricity may be of three types. Is the electrical phenomena of thunderstorms and the phenomena of continuous electrification in the air, and the phenomena of the polar aurora is the third type.
At the left: Lightning in Oradea (Romania).
The electricity accumulated in the atmosphere
provoked this phenomena.
References:
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