S OLAR R OSSBY W AVES William Cramer University of Chicago - PowerPoint PPT Presentation

S OLAR R OSSBY W AVES William Cramer – University of Chicago Advisor: Scott McIntosh -- HAO

W HAT IS A R OSSBY WAVE ?

S OME EQUATIONS Φ is latitude, ω is angular rotation speed of the Earth, a is the mean radius of the Earth, and f is the planet’s vorticity as a function of latitude (subject to some perturbation) The Rossby Parameter If β =0 there is NO Rossby wave

S OLAR VS . P LANETARY WAVE Solar Earth  Origin as of yet  Results from the unknown. Coriolis effect due to  Could be result of rotation of the Earth. rotation of the sun,  Emerge due to magnetic fields, other sheering of fluid/air in factors. the atmosphere and  Most likely a deep rooted phenomenon. ocean  Could be in different layers (some clusters move in opposite directions!)

D ETECTING R OSSBY W AVES : B RIGHT P OINTS  ~2-5 Mm  Zones of intense EUV/ X-ray radiation  Clusters found mostly below ±55° latitude

STEREO A+B & AIA

M AKING SENSE OF THE DATA

S LICING THE DATA AIA STEREO A STEREO B

A CCOUNTING FOR THE B - ANGLE  B-angle is result of tilt of satellite to sun’s axis.  If B-angle is not properly subtracted, wave behavior could be an artifact of this.

BP C LUSTERS

C LUSTER S TATISTICS 25 25 20 20 Frequency [Puffs] Frequency [Puffs] 15 15 10 10 5 5 0 0 � 45 � 30 � 15 0 15 30 45 0 100 200 300 Latitude[Degrees] Carrington Longitude [Degrees] 2.5 2.0 log 10 Frequency [Puffs] 1.5 1.0 0.5 0 20 40 60 80 100 120 Duration [Days]

F ULL DATA C UBE

L ATITUDE SLICES

H OVMÖLLER D IAGRAMS Generation of eddy kinetic energy on Earth “Arguably, one of the best methods to identify RWTs on weather maps is pattern recognition by the human brain”. Source: Glatt et. al. Tellus 2011

R OSSBY WAVE EVIDENCE

L ONGITUDE S LICE

A CKNOWLEDGEMENTS  Thanks to:  Scott McIntosh and Rebecca Centeno Elliott  Marty Snow and Erin Wood  My erstwhile coworker Manuel Marcano  Everyone for a wonderful time in Boulder