Open Access

Combined ground-based optical support for the aurora (DELTA) sounding rocket campaign

  • Eoghan Griffin13Email author,
  • Mike Kosch23, 73,
  • Anasuya Aruliah13,
  • Andrew Kavanagh23,
  • Ian McWhirter13,
  • Andrew Senior23,
  • Elaina Ford13,
  • Chris Davis33,
  • Takumi Abe43,
  • Junichi Kurihara43,
  • Kirsti Kauristie53 and
  • Yasunobu Ogawa63
Earth, Planets and Space200658:BF03352000

https://doi.org/10.1186/BF03352000

Received: 29 September 2005

Accepted: 12 April 2006

Published: 29 September 2006

Abstract

The Japan Aerospace Exploration Agency (JAXA) DELTA rocket experiment, successfully launched from Andøya at 0033 UT on December 13, 2004, supported by ground based optical instruments, primarily 2 Fabry- Perot Interferometers (FPIs) located at Skibotn, Norway (69.3°N, 20.4°E) and the KEOPS Site, Esrange, Kiruna, Sweden (67.8°N, 20.4°E). Both these instruments sampled the 557.7 nm lower thermosphere atomic oxygen emission and provided neutral temperatures and line-of-sight wind velocities, with deduced vector wind patterns over each site. All sky cameras allow contextual auroral information to be acquired. The proximity of the sites provided overlapping fields of view, adjacent to the trajectory of the DELTA rocket. This allowed independent verification of the absolute temperatures in the relatively quiet conditions early in the night, especially important given the context provided by co-located EISCAT ion temperature measurements which allow investigation of the likely emission altitude of the passive FPI measurements. The results demonstrate that this altitude changes from 120 km pre-midnight to 115 km post-midnight. Within this large scale context the results from the FPIs also demonstrate smaller scale structure in neutral temperatures, winds and intensities consistent with localised heating. These results present a challenge to the representation of thermospheric variability for the existing models of the region.

Key words

Polar aeronomylower thermosphereFabry-Perot Interferometer