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Earth, Planets and Space

Table 1 Observation results and discussions of four events

From: Thermospheric wind variations observed by a Fabry–Perot interferometer at Tromsø, Norway, at substorm onsets

Red-line event (component)

Local time

Wind variation (m/s)

Diurnal tide

Plasma convection

Arc-associated electric field

Directional winds

Joule heating

R1 (East)

01:18

+ 17.5

N

Y

U

Y

Y

R1 (North)

01:18

− 18.4

Y

N

U

N

Y

R2 (East)

20:25

+ 48.9

Y

N

N

U

Y

R2 (North)

20:25

− 41.8

Y

Y

U

U

Y

R3 (East)

23:23

+ 32.3

N

Y

N

Y

Y

R3 (North)

23:23

+ 35.5

N

N

U

Y

Y

R4 (East)

01:46

+ 24.5

Y

Y

U

Y

Y

R4 (North)

01:46

− 23.0

Y

N

U

Y

Y

  1. Y wind variation is consistent with that effect (for directional winds: two winds are consistent; for Joule heating: auroral activities penetrated into the Fabry–Perot interferometer scanning region); N wind variation is inconsistent with that effect (for directional winds: two winds are inconsistent); U uncertain or not discussed
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