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Why Is Non-thermal Line Broadening of Spectral Lines in The Lower Transition Region of the Sun Independent of Spatial Resolution?
Bart De Pontieu, Scott McIntosh, Juan Martinez-Sykora +2
Spectral observations of the solar transition region (TR) and corona show broadening of spectral lines beyond what is expected from thermal and instrumental broadening. The remaini…
Observations and numerical models of solar coronal heating associated with spicules
Bart De Pontieu, Ineke De Moortel, Juan Martinez-Sykora +1
Spicules have been proposed as significant contributors to the mass and energy balance of the corona. While previous observations have provided a glimpse of short-lived transient b…
North-south asymmetry in Rieger-type periodicity during solar cycles 19-23
Eka Gurgenashvili, Teimuraz V. Zaqarashvili, Vasil Kukhianidze +4
Rieger-type periodicity has been detected in different activity indices over many solar cycles. It was recently shown that the periodicity correlates with solar activity having a s…
Deciphering Solar Magnetic Activity: Spotting Solar Cycle 25
Scott W. McIntosh, Robert J. Leamon
We present observational signatures of solar cycle 25 onset. Those signatures are visibly following a migratory path from high to low latitudes. They had starting points that are a…