Monthly Archives: January 2014

3. The Biggest Sunspots Produced by Cycle 24

Contributed by Aimee Norton. Posted on January 30, 2014

Even though Solar Cycle 24 is weak, it has still produced some large sunspots. We list the largest sunspots as observed by HMI and discuss some aspects of the data.

2. Testing Hemispheric Rule of Helicity with HMI Data

Contributed by Yang Liu. Posted on January 26, 2014

Hemispheric helicity preference in groups of active regions with different properties suggests different origins of magnetic twist.

1. Evidence of Double-Cell Meridional Circulation inside the Sun

Contributed by Junwei Zhao. Posted on January 7, 2014

Acoustic travel time reveals an equatorward meridional flow in the middle of the solar convection zone. Inversion reveals an evidence of double-cell meridional circulation inside the Sun.