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Sunspot
* All sunspots have a strong magnetic field.
* Most sunspots are roughly circular in shape
  - come in pairs with a magnetic field that looks somewhat like that of a bar magnet
  - emit radiation
* Shows a current view of the sun.
* Some sunspots are also visible
  - surrounded by a bright border
* Some sunspots have fields
  - magnetic fields
  - strong magnetic fields
* actually occur in groups.
* also have an indirect but significant impact on life here on earth.
* always come in pairs like the north and south poles on a bar magnet.
* apparently are depressions in the photosphere.
* appear as dark patches
  - spots on the sun
  - dim blobs because they are relatively cooler than the rest of the sun's surface
  - historic sites
* appear dark because they are cooler than the rest of the sun's visible surface
  - than the surface of the sun
  - than the surrounding surface of the sun
  - in contrast to the hot, surrounding photosphere
  - only in contrast to surrounding hotter regions
  - in pairs, one the positive terminal, the other the negative terminal
* appear to be dark because, compared to the surrounding photosphere, they are cooler
  - move across the sun's disk
  - where powerful magnetic fields breech the surface of the sun
* are a major source of electromagnetic energy
  - measure of solar activity
  - about the size of the Earth and frequently occur in groups, as shown above
  - among the most prominently visible surface magnetic features
* are areas of concentrated magnetic energy on the sun
  - high magnetic activity that appear as freckles on the sun's face
  - on our star where magnetic energy is concentrated
* are concentrations of magnetic flux, occuring in bipolar clusters or groups
  - typically occurring in bipolar clusters or groups
  - strong magnetic fields piercing the solar photosphere
  - the magnetic flows through the sun's surface
  - cool areas on the sun s surface
* are cooler areas in the photosphere produced by local changes in the magnetic field
  - on the sun's surface surrounded by twisted magnetic fields
  - regions on the photosphere
  - regions, as compared to the surrounding photosphere
* are cooler, darker areas of strong magnetic fields
  - regions on the sun's surface caused by a distortion of magnetic fields
  - cools areas with powerful magnetic fields
* are dark areas on the sun's fiery surface
  - that move across the surface of the sun, usually lasting a few weeks
  - because a
* are dark because they are cooler than the surrounding photosphere
  - the coolest places on the sun
* are dark spots on the suns surface
  - that migrate across the surface of the sun
  - darker and cooler than the rest of the solar surface
  - darker, cooler areas on the surface of the sun in a region called the photosphere
  - huge and act just like poles
* are in areas located on the surface of the sun that are cooler than the surrounding areas
  - the millions of degrees unlike the rest of the sun
  - indicators of small twisted loops in the sun's magnetic field
* are like high-energy lighthouses
  - storms, caused by magnetic fields, which are often larger than the Earth
  - located in sun
  - locations where intense magnetic fields pass through the photosphere
  - lower on the surface while the granules are higher
* are magnetic in nature and so come in pairs, like the ends of a magnet
* are magnetic storms on the photosphere that appear as dark areas
  - which appear from time to time on the sun
  - nevertheless hotter than the surfaces of many stars
  - patches created by strong magnetic fields on the surface of the sun
  - probably the most remarkable feature associated with the photosphere
* are regions of stronger magnetic field
  - where the solar magnetic field is very strong
  - which are cooler and darker than surrounding material
* are relatively cool areas that appear as dark blemishes on the face of the sun
  - as dark spots on the solar surface
  - magnetic storms that almost constantly tranverse the sun's face
  - regions within the visible surface of the sun
  - cool, dark features on the sun's surface that are often roughly circular
* are relatively dark spots on the surface of the sun
  - that typically appear in groups on the surface of the sun
  - small but then grow larger
* are sources of flares, the most violent events in the solar system
  - which are the most violent events in the sun
  - strong magnetism
* are storms on the surface of the sun
  - that appear as dark marks on the sun
* are the areas of cooler gases in the photosphere
  - most easily observed solar feature, and a useful subject for classroom study
  - precursors to solar flares and other space weather events
  - size of the earth and they appear in groups on the sun's surface
  - visual indication of the process that sends charged particles into space
* are visible from Earth
  - in H-alpha, but their prenubras are lower in contrast then in white light
  - where magnetic field is strongest and field lines are closest together
* can be larger than the Earth and typically last for only a few days
  - many times larger than the entire Earth itself
  - even effect nature
  - occur singly and in groups, and they can be of very different sizes
  - strictly improve resource allocation in non-convex economies
* cause coronal mass ejections, otherwise known as solar flares
  - the effect of atmospheric disturbances
  - variations in solar brightness
* consequently appear dark against the background of the photosphere.
* consist of concentrations of strong magnetic flux.
* consists of dark center umbra and outer border penumbra.
* develop in a matter of hours as small pores in the intergranular region of the photosphere.
* directly contribute to the reduction of the solar irradiance.
* emit high levels of electromagnetic radiation
* form in pairs - one at each end of the magnetic loop, and usually last for a few days
  - each end of the magneticloop, and usually last for a few days
  - where solar magnetic field lines have broken through the surface
* generally occur in pairs and are regions of strong magnetic fields.
* gradually shift their locations from high latitudes towards the equator.
* grow larger as time goes on.
* happen in a cycle which is fairly predictable.
* have a highly unusual appearence in white light observations
  - lifetime from as little as a few hours to many weeks
  - two components - a dark inner penumbra and a lighter outer umbra
* increase with solar maximum, and are relatively rare during solar quiet times.
* indicate enhanced solar activity.
* mark the positions of the poles of the magnet.
* normally start as pores, then grow, or develop.
  - pairs with opposing magnetic polarity
  - when a concentrated portion of the solar magnetic field pokes through the surface
* often appear to move in pairs
  - cluster in families, called sunspot groups
  - form in groups, with the largest spanning several Earth diameters across
  - occur in pairs, or in groups
* only exist for at the most a few months each.
* originate in the photoshere and migrate toward the equator.
* pairs represent loops of magnetic field breaking through the surface.
* reflect solar activity in historic period, while another useful sort is aurora.
* regularly appear and disappear in eleven-year cycles.
* relatively dark area on the surface of the sun.
* sometimes change noticeably over periods of several hours.
* tend to appear at latitudes of greatest differential rotation
  - occur in clusters and to last about two weeks
* tend to occur in pairs associated with North and South magnetic poles
  - that have magnetic fields pointing in opposite directions
* typically grow over a few days and last anywhere from a few days to a few months
  - last a few days before dissipating
  - occur in clusters or groups
* usually appear in groups.
* usually appear in pairs of opposite magnetic polarity
  - pairs, as can be seen here
  - come in groups with two sets of spots
  - exist as pairs with opposite magnetic polarity
  - have a dark central region called the umbra
  - presage stormy solar weather
* vary greatly in size but are always small compared to the size of the sun.