Solar Cycles

Slow appearance of sunspots challenges theory

HAO along with researchers from the Max Planck Institute for Solar System Research, The University of Göttingen, and NorthWest Research Associates have now shown that magnetic flux concentrations forming active regions on the sun emerge at a rate much slower than predicted by the prevailing curre

Stellar Evidence that the Sun May be in Transition

chromospheric activity and rotation in field dwarfs and subgiants
Friday, July 1, 2016

The study of Sun-like stars helps us to put the Sun in context. HAO Newkirk Fellow Ricky Egeland has co-authored a new publication with Space Science Institute scientist Travis Metcalfe and Carnegie Fellow Jennifer van Saders.

Matthias Rempel

Dr. Matthias Rempel is a Senior Scientist in the High Altitude Observatory at the National Center for Atmospheric Research. His research area is solar physics, with special emphasis on theoretical modeling of the solar interior and the solar photosphere.

Liying Qian

Dr. Liying Qian is a Project Scientist in the High Altitude Observatory of the National Center for Atmospheric Research. She studies space weather impact on the thermosphere and ionosphere.

Scott McIntosh

Dr. Scott McIntosh is Deputy Director to NCAR and a Senior Scientist in the High Altitude Observatory at the National Center for Atmospheric Research.

The Sun's seasonal weather patterns

Scott McIntosh details the Sun's seasonal weather patterns and demonstrates how understanding the formation, interaction and instability of the Sun's activity bands will considerably improve forecast capability in space weather and solar activity over a range of timescales.

Global ionospheric climatology

NmF2 climatology for 2007 to 2010 in magnetic latitude bins image
Friday, November 2, 2012

Extensive analyses of COSMIC data for 2007–2010 have revealed a number of features concerning seasonal and solar-cycle variation. Low-latitude ionospheric peak density NmF2 was dominated by the semi-annual anomaly, the equatorial anomaly and the annual asymmetry.

A different picture of the interior of the sun

Friday, September 5, 2014

New observational work provides more information about the evolution of the Sun's interior and origins of its enigmatic 11(-ish) solar cycle. The research potentially opens the door to improved forecasting of decadal-scale solar variability.

Long-Term Solar Variability

Overview and Research Goal

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