News & Events

HEPL / KIPAC Seminar

Wednesday, August 31, 2016

Rachel Howe

University of Birmingham (UK)

Helioseismic Frequency Shifts and Solar Activity

Abstract: The finding that the frequencies of helioseismic oscillation modes change with solar activity is one of the earliest results from helioseismic observations, but it still presents puzzles today.

In this talk I will update some of the results obtained during the previous solar cycle at low, medium, and high degree, and discuss some of the anomalies that have arisen in recent years. We will see that (certainly for low degree, and by implication for higher-degree modes also) the old results remain robust, but there are subtleties that may contain new information.

Bio: Rachel Howe obtained her PhD in Ice Physics at the University of Birmingham, and then moved into the field of helioseismology, first as a postdoc with the High Resolution Spectroscopy Group at Birmingham, where she worked on low-degree solar oscillation observations from what was then soon to be named the BiSON network.

In 1995 she moved to Queen Mary, University of London and was introduced to the world of resolved-Sun observations. In London she began to work on resolved-Sun observations from the newly commissioned GONG and (a little later) MDI instruments. From 1997 to 2010 she worked with the GONG project in Tucson.

She has now returned to the UK and holds an honorary position at the University of Birmingham, where she continues to pursue her interests in activity-related helioseismic mode parameter variations and solar rotation.

Time: 1:30 – 2:30pm

Location: Physics/Astrophysics Bldg., Kistler Conference Rooms 102/103 (Map)

(Light refreshments at1:15pm; Presentation begins at 1:30pm)

Open to All