Safargaleev, V., Sergienko, T., Hosokawa, K. et al. Altitude of pulsating arcs as inferred from tomographic measurements. Earth Planets Space 74, 31 (2022). https://doi.org/10.1186/s40623-022-01592-8
Altitude of pulsating arcs as inferred from tomographic measurements
|Author:||Safargaleev, Vladimir1; Sergienko, Tima2; Hosokawa, Keisuke3;|
1Polar Geophysical Institute RAS, Apatity, Russia
2Swedish Institute of Space Physics, Kuruna, Sweden
3University of Electro-Communications, Tokyo, Japan
4Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan
5National Institute of Polar Research, Tokyo, Japan
6Space Physics and Astronomy Research Unit, University of Oulu, Oulu, Finland
7The Graduate University for Advanced Studies, SOKENDAI, Tokyo, Japan
8Joint Support-Center for Data Science Research, Research Organization of Information and Systems, Tokyo, Japan
9Research Institute for Sustainable Humanosphere, Kyoto University, Kyoto, Japan
10Research Organization of Information and Systems, Toranomon, Minato-ku, Tokyo, Japan
|Online Access:||PDF Full Text (PDF, 3.5 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe2023021026755
|Publish Date:|| 2023-02-10
Data from three all-sky cameras in Kiruna and Tjautjas (Sweden) were used to estimate the altitude of pulsating arc-like forms using optical tomography. The event under consideration occurred during the substorm recovery phase and comprised both periodic luminosity variation of the on/off type with repetition periods of 3–6 s (main pulsations) and faster scintillation (approximately 2 Hz) during the “on” phase of the main pulsations. It is found that (1) the altitudes of the pulsating auroral arcs decrease during “on” intervals from ~ 95 km to ~ 92 km and (2) for two closely spaced arcs, internal modulation took place only in the lowest arc. The results may be interpreted in the frame of the traditional mechanism assuming electron scattering via VLF-wave/particle interaction in the equatorial magnetosphere, while the internal modulation may also be alternatively interpreted in the frame of the less-often inferred mechanism of field-aligned acceleration somewhere between the equatorial plane and ionosphere.
Earth, planets and space
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
The work of Japanese co-authors has been supported by JSPS KAKENHI JP 15H05747 and 16H06286. The operation of the EMCCD camera at Tjautjas has been supported by Swedish Institute of Space Physics. We acknowledge support through the Swedish National Space Agency (SNSA) to the Swedish Institute of Space Physics Dnr.153/16.
The EMCCD all-sky camera data from Tjautjas are accessible at the following https://doi.org/10.34515/DATA.GND-0062-0006-0204_v01 The watec monochromatic/color data are accessible at the following links: http://pc115.seg20.nipr.ac.jp/www/optical/watec/krn/rawdata/ (for Kiruna data) and http://pc115.seg20.nipr.ac.jp/www/optical/watec/tja/rawdata/ (for Tjautjas data). They are also connected to the AQVN database: http://pc115.seg20.nipr.ac.jp/www/AQVN/index.html.
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