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  2. Solar flare - Wikipedia

    en.wikipedia.org/wiki/Solar_flare

    In 1943, Grote Reber was the first to report radioastronomical observations of the Sun at 160 MHz. The fast development of radioastronomy revealed new peculiarities of the solar activity like storms and bursts related to the flares. Today, ground-based radiotelescopes observe the Sun from c. 15 MHz up to 400 GHz.

  3. Solar radio emission - Wikipedia

    en.wikipedia.org/wiki/Solar_radio_emission

    The frequency drifts from higher to lower values because it depends on the electron density, and the shock propagates outward away from the Sun through lower and lower densities. By using a model for the Sun's atmospheric density, the frequency drift rate can then be used to estimate the speed of the shock wave.

  4. Cosmic microwave background - Wikipedia

    en.wikipedia.org/wiki/Cosmic_microwave_background

    The latter is caused by the peculiar velocity of the Sun relative to the comoving cosmic rest frame as it moves at 369.82 ± 0.11 km/s towards the constellation Crater near its boundary with the constellation Leo [8] The CMB dipole and aberration at higher multipoles have been measured, consistent with galactic motion. [9]

  5. The sun is at its 11-year maximum. That means another ... - AOL

    www.aol.com/sun-11-maximum-means-another...

    NASA says the sun is in the highly active "maximum phase" of its 11-year solar cycle.. That means there will probably be big solar storms bringing beautiful aurora in the next year or so. Solar ...

  6. Schumann resonances - Wikipedia

    en.wikipedia.org/wiki/Schumann_resonances

    The global electromagnetic resonance phenomenon is named after physicist Winfried Otto Schumann who predicted it mathematically in 1952. Schumann resonances are the principal background in the part of the electromagnetic spectrum [2] from 3 Hz through 60 Hz [3] and appear as distinct peaks at extremely low frequencies around 7.83 Hz (fundamental), 14.3, 20.8, 27.3, and 33.8 Hz.

  7. Solar observation - Wikipedia

    en.wikipedia.org/wiki/Solar_observation

    From 2007 to 2009, sunspot levels were far below average. In 2008, the Sun was spot-free 73 percent of the time, extreme even for a solar minimum. Only 1913 was more pronounced, with no sunspots for 85 percent of that year. The Sun continued to languish through mid-December 2009, when the largest group of sunspots to emerge for several years ...

  8. Sunlight - Wikipedia

    en.wikipedia.org/wiki/Sunlight

    Although the solar corona is a source of extreme ultraviolet and X-ray radiation, these rays make up only a very small amount of the power output of the Sun (see spectrum at right). The spectrum of nearly all solar electromagnetic radiation striking the Earth's atmosphere spans a range of 100 nm to about 1 mm (1,000,000 nm).

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