Simultaneous Observations of Hα Moreton Waves and EUV Waves

Astronomy and Astrophysics – Astronomy

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Scientific paper

The first period of major solar activity in the current cycle, due to AR 11158 in mid February 2011, produced a sequence of solar flares exhibiting both Moreton waves in H-alpha images and "EIT-waves" seen in EUV images. Given the rarity of Moreton waves, this offers an excellent opportunity to compare the properties of the two phenomena with simultaneous observations. We analyze several events and compare the speeds and locations of the disturbances using high-cadence H-alpha data from both the ISOON telescope at Sunspot, NM, and the GONG network, together with EUV images in several wavelengths from the SDO/AIA telescope, and interpret the results in light of current models for such disturbances.

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