Suppression of ionospheric irregularity due to auroral particle impact
Permanent lenke
https://hdl.handle.net/10037/26368Dato
2021-12-16Type
Journal articleTidsskriftartikkel
Peer reviewed
Forfatter
Takahashi, Toru; Spicher, Andres; Di Mare, Francesca; Rowland, Douglas E.; Pfaff, Robert F.; Collier, Michael R.; Clausen, Lasse; Moen, Jøran IdarSammendrag
The VISIONS-2 35.039 sounding rocket was launched from Ny-Ålesund, Svalbard, on 7
December 2018 at 11:06 UT, and traveled overhead of the cusp aurora. The payload reached an apogee of
806.6 km and provided measurements of the electric field (E) and electron density (Ne
) with a high sampling
rate of 6,250 Hz. The high-sampling-data make it possible to estimate the horizontal structure of E and Ne
on
scales ranging from meters to kilometers scale. The horizontal variation in the electron density and electric field
(ΔNe
/Ne
and ΔE) and integrated power of Ne
and E (ΣPNe and ΣPE) for 1–10, 10–100, and 100–1,000 Hz range
were derived. The derived values were compared with the 557.7 and 630.0 nm emission intensities obtained
from an all-sky camera installed in Ny-Ålesund projected at the footprint of the rocket, which was calculated
by tracing the Earth's magnetic field line from the rocket altitude to the emission layer. ΔNe
/Ne
, ΔE, ΣPNe, and
ΣPE increased with the 630.0 nm emission intensity. Of particular interest is the lower level irregularity was
observed when the 557.7 nm emission intensity exceeded 4.5 kR compared with other time interval. This may
suggest that particle impact ionization created sufficient Pedersen conductance in the E-region to short the
F-region current. This short-circuit seemed to cause the suppression of the irregularities in the F-region and
lower level irregularities were also observed in the rocket altitude.
Forlag
WileySitering
Takahashi, Spicher, Di Mare, Rowland, Pfaff, Collier, Clausen, Moen. Suppression of ionospheric irregularity due to auroral particle impact. Journal of Geophysical Research (JGR): Space Physics. 2022;127(1)Metadata
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