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

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Feb 11, 2023 254 likes •446 views

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 is latitude, is angular rotation speed of the Earth, a is the mean radius of the Earth, and f is the

SLIDE 1

SOLAR ROSSBY WAVES

William Cramer – University of Chicago Advisor: Scott McIntosh -- HAO

SLIDE 2

WHAT IS A ROSSBY WAVE?

SLIDE 3

SOME 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) If β=0 there is NO Rossby wave The Rossby Parameter

SLIDE 4

SOLAR VS. PLANETARY WAVE

 Origin as of yet

unknown.

 Could be result of

rotation of the sun, magnetic fields, other factors.

 Most likely a deep

rooted phenomenon.

 Could be in different

layers (some clusters move in opposite directions!)

 Results from the

Coriolis effect due to rotation of the Earth.

 Emerge due to

sheering of fluid/air in the atmosphere and

cean

Solar Earth

SLIDE 5

DETECTING ROSSBY WAVES: BRIGHT POINTS

 ~2-5 Mm  Zones of intense EUV/

X-ray radiation

 Clusters found mostly

below ±55° latitude

SLIDE 6

STEREO A+B & AIA

SLIDE 7

MAKING SENSE OF THE DATA

SLIDE 8

SLICING THE DATA

AIA STEREO A STEREO B

SLIDE 9

ACCOUNTING 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.

SLIDE 10

BP CLUSTERS

SLIDE 11

CLUSTER STATISTICS

45 30 15 15 30 45 Latitude[Degrees] 5 10 15 20 25 Frequency [Puffs] 100 200 300 Carrington Longitude [Degrees] 5 10 15 20 25 Frequency [Puffs] 20 40 60 80 100 120 Duration [Days] 0.5 1.0 1.5 2.0 2.5 log10 Frequency [Puffs]

SLIDE 12

FULL DATA CUBE

SLIDE 13

LATITUDE SLICES

SLIDE 14

HOVMÖLLER DIAGRAMS

Generation of eddy kinetic energy on Earth

Source: Glatt et. al. Tellus 2011

“Arguably, one of the best methods to identify RWTs on weather maps is pattern recognition by the human brain”.

SLIDE 15

ROSSBY WAVE EVIDENCE

SLIDE 16

LONGITUDE SLICE

SLIDE 17

ACKNOWLEDGEMENTS

 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