Global sounding of F; region irregularities by COSMIC during a geomagnetic storm

Hocke, Klemens; Liu, Huixin; Pedatella, Nicholas; Ma, Guanyi (2018). Global sounding of F; region irregularities by COSMIC during a geomagnetic storm (Submitted). Annales geophysicae discussions, pp. 1-14. Copernicus Publications 10.5194/angeo-2018-117

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We analyze reprocessed electron density profiles and TEC profiles of the ionosphere in September 2008 (aroundsolar minimum) and September 2013 (around solar maximum) obtained by the Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC). The TEC profiles describe the total electron content along the ray path from the GPS satellite to the low Earth orbit as function of the tangent point of the ray. Some of the profiles in the magnetic polarregions show small-scale fluctuations with spatial scales<50km. Possibly the trajectory of the tangent point intersects spatial electron density irregularities in the magnetic polar region. For derivation of the morphology of the electron density and TECfluctuations, a 50 km high pass filter is applied in the s-domain where s is the distance between a reference point (bottomtangent point) and the tangent point. For each profile, the mean of the fluctuations is calculated for tangent point altitudesbetween 400 and 500 km. First at all, the global maps of∆Neand∆TEC are quite similar. However, ∆TEC might be morereliable since it is based on less retrieval assumptions. We find a significant difference if the arithmetic mean or the median is applied to the global map of September 2013. The global map of ∆TEC at solar maximum (September 2013) has stronger fluctuations than those at solar minimum (September 2008). Finally, we compare the global maps of the quiet phase and the storm phase of the geomagnetic storm of 15 July 2012. It is evident that the TEC fluctuations are increased and extended overthe Southern magnetic polar region at the day of the geomagnetic storm. The North-South asymmetry of the storm response is more pronounced in the upper ionosphere (ray tangent points h=400-500km) than in the lower ionosphere (ray tangent points h=200-300km).

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Applied Physics

UniBE Contributor:

Hocke, Klemens

Subjects:

600 Technology > 620 Engineering

ISSN:

2568-6402

Publisher:

Copernicus Publications

Language:

English

Submitter:

Franziska Stämpfli

Date Deposited:

26 Mar 2019 13:04

Last Modified:

25 Oct 2019 00:05

Publisher DOI:

10.5194/angeo-2018-117

BORIS DOI:

10.7892/boris.128605

URI:

https://boris.unibe.ch/id/eprint/128605

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