Solar  wind  à atmosphereà societyJoshua Semeter, Boston University

The  solar  wind  hammer:  Global  response

Tangential   stress  (Maxwell  +  viscous):

€

F = µ∇ B CF

€

F = j × B

Normal stress:

Tangential   stress  (Maxwell  +  viscous):

€

F = µ∇ B CF

€

F = j × B

Normal stress:

The  solar  wind  hammer:    Hierarchical  response

Airglow  and  Aurora:    A  rich  information  bearing  signal!

Magnetospheric  projections

The  signal  is  inherently  tomographic

Vertical dimension: particle energeticsParallel dimension: acceleration region physics

Tomographic  analysis

Tomographic  analysis  of  100-­m  scale  aurora

A

From Dahlgren et al., 2013

Optimal  imager  networksSquare Packing

Hexagonal Packing

Tomographic!

Even modest overlap provides enough differential information to extract average energy and net energy flux through auroraltomography [Hirsch et al., IEEE 2016]