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- Q4117230 subject Q8595485.
- Q4117230 abstract "The term magnetogram has two meanings, used separately in the contexts of magnetic fields of the Sun and the Earth.In the context of the magnetic field of the Sun, the term magnetogram refers to a pictorial representation of the spatial variations in strength of the solar magnetic field. Magnetograms are often produced by exploiting the Zeeman effect (or, in some cases, the Hanle effect), which George Ellery Hale employed in the first demonstration that sunspots were magnetic in origin, in 1908. Solar magnetograms are produced by suitably instrumented telescopes referred to as magnetographs. Some magnetographs can only measure the component of the magnetic field along the line of sight from the observer to the source (the field's "longitudinal" component). One example of such a "line-of-sight" or "longitudinal" magnetograph is the Michelson Doppler Imager (MDI), a scientific instrument that takes magnetograms of the Sun in order to measure velocity and magnetic fields in the Sun's photosphere to learn about the convection zone and about the magnetic fields which control the structure of the solar corona. A vector magnetograph also measures the component of the magnetic field perpendicular to the line of sight (the field's "transverse" component), from which all three components of the magnetic field vector can be deduced. Two examples include the National Solar Observatory's SOLIS instrument and the Helioseismic and Magnetic Imager aboard NASA's Solar Dynamics Observatory satellite.In the context of geophysics, a magnetogram is a measurement of temporal variation the local strength and direction of the geomagnetic field. Such magnetograms have existed since Victorian times, and the British Geological Survey has preserved records from the 1850s, showing the effects of the 1859 Carrington Event, the worst magnetic storm known to have hit Earth.".
- Q4117230 wikiPageExternalLink obs_prog.html.
- Q4117230 wikiPageExternalLink solis.nso.edu.
- Q4117230 wikiPageExternalLink 137558.
- Q4117230 wikiPageWikiLink Q11408.
- Q4117230 wikiPageWikiLink Q128034.
- Q4117230 wikiPageWikiLink Q170754.
- Q4117230 wikiPageWikiLink Q182688.
- Q4117230 wikiPageWikiLink Q2.
- Q4117230 wikiPageWikiLink Q201805.
- Q4117230 wikiPageWikiLink Q2707219.
- Q4117230 wikiPageWikiLink Q312288.
- Q4117230 wikiPageWikiLink Q320638.
- Q4117230 wikiPageWikiLink Q3566473.
- Q4117230 wikiPageWikiLink Q382494.
- Q4117230 wikiPageWikiLink Q4213.
- Q4117230 wikiPageWikiLink Q46255.
- Q4117230 wikiPageWikiLink Q525.
- Q4117230 wikiPageWikiLink Q6372.
- Q4117230 wikiPageWikiLink Q6500960.
- Q4117230 wikiPageWikiLink Q6582994.
- Q4117230 wikiPageWikiLink Q662051.
- Q4117230 wikiPageWikiLink Q7917830.
- Q4117230 wikiPageWikiLink Q8595485.
- Q4117230 wikiPageWikiLink Q919304.
- Q4117230 wikiPageWikiLink Q94866.
- Q4117230 comment "The term magnetogram has two meanings, used separately in the contexts of magnetic fields of the Sun and the Earth.In the context of the magnetic field of the Sun, the term magnetogram refers to a pictorial representation of the spatial variations in strength of the solar magnetic field.".
- Q4117230 label "Magnetogram".