University of Oulu

Grandin, M., A. Kero, N. Partamies, D. McKay, D. Whiter, A. Kozlovsky, and Y. Miyoshi (2017), Observation of pulsating aurora signatures in cosmic noise absorption data, Geophys. Res. Lett., 44, 5292–5300, doi:10.1002/2017GL073901

Observation of pulsating aurora signatures in cosmic noise absorption data

Saved in:
Author: Grandin, M.1,2; Kero, A.1; Partamies, N.3,4;
Organizations: 1Sodankylä Geophysical Observatory, University of Oulu, Sodankylä, Finland
2IRAP, Université de Toulouse, CNRS, UPS, CNES, Toulouse, France
3Department of Arctic Geophysics, University Centre in Svalbard, Longyearbyen, Norway
4Birkeland Centre for Space Science, Bergen, Norway
5Department of Physics and Technology, University of Tromsø, Tromsø, Norway
6Space Environment Physics, University of Southampton, Southampton, UK
7Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1.3 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe201709058494
Language: English
Published: American Geophysical Union, 2017
Publish Date: 2017-09-05
Description:

Abstract

This study investigates the contribution of energetic (E >30 keV) particle precipitation during a pulsating aurora event over Kilpisjärvi (L = 6.2) on 26 February 2014. It is based on the comparison of auroral blue-line emission (427.8 nm) data from an all-sky camera and cosmic noise absorption (CNA) data obtained from a multibeam experiment of the Kilpisjärvi Atmospheric Imaging Receiver Array (KAIRA) riometer. The data sets are compared for three KAIRA beams close to magnetic zenith. Results show a clear correlation between the measured CNA and the auroral blue-line emission during the event, for each beam. In addition, individual pulsations are observed for the first time in the cosmic noise absorption data measured by KAIRA and are found to be close-to-identical to the optical pulsations. This suggests that the modulation of electron precipitation during pulsating aurora takes place in a consistent way over a broad range of energies.

see all

Series: Geophysical research letters
ISSN: 0094-8276
ISSN-E: 1944-8007
ISSN-L: 0094-8276
Volume: 44
Issue: 11
Pages: 5292 - 5300
DOI: 10.1002/2017GL073901
OADOI: https://oadoi.org/10.1002/2017GL073901
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Subjects:
Funding: This work was supported by the International Space Science Institute (ISSI) in Bern, Switzerland. A. Kero was supported by European Regional Development Fund (Regional Council of Lapland, decision A70179). N. Partamies was supported by the Norwegian Research Council (grant 223252). Y. Miyoshi was supported by a Grant-in-Aid for Scientific Research (15H051815, 15H05747, and 16H06286) from MEXT, Japan. The Kilpisjärvi all-sky camera images were obtained from the MIRACLE database (http://space.fmi.fi/MIRACLE/). The authors thank all the people contributing to the annual operation, maintenance, and calibration of the MIRACLE cameras. The KAIRA data come from the Sodankylä Geophysical Observatory database (http://www.sgo.fi). KAIRA was funded by the University of Oulu and the FP7 European Regional Development Fund and is operated by Sodankylä Geophysical Observatory.
Copyright information: ©2017. American Geophysical Union. All Rights Reserved. Published in this repository with the kind permission of the publisher.