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Submitted on 2013-10-03
Once again, sunspot and related solar activity was very low last week. Nonetheless, the period featured two very nice eruptions during the evening hours of resp. 24 and 29 September. See this movie. The images underneath show the eruptions as seen with the SDO/AIA 304 filter in extreme ultraviolet (EUV).
The 24 September eruption
Submitted on 2013-09-25
All solar observers and space weather monitors have noticed it: Over the last few weeks, solar activity has dropped again to very low levels.
Submitted on 2013-09-19
A quite impressive filament eruption took place on the Sun's backside on 11 September (see this movie). Solar filaments are clouds of ionized gas above the solar surface squeezed between magnetic regions of opposite polarity. Being cooler and denser than the plasma underneath and their surroundings, they appear as dark lines when seen on the solar disk using special filters.
Submitted on 2013-09-12
Solar filaments are clouds of ionized gas above the solar surface squeezed between magnetic regions of opposite polarity. Being cooler and denser than the plasma underneath and their surroundings, they appear as dark lines when seen on the solar disk using special filters, such as Hydrogen-alpha that shows the "cold" inner atmosphere of the Sun ("chromosphere").
Submitted on 2013-07-31
The month of July saw some really great prominence activity. Prominences are relatively cool and dense structures reaching all the way up into the Sun's hot outer atmosphere. This movie shows nine events picked from a long list.
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