Features of Longitudinal Variations of Geomagnetic and Ionospheric Parameters during Severe Magnetic Storms in 2015

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F19%3A00531709" target="_blank" >RIV/68378289:_____/19:00531709 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1109/PIERS-Spring46901.2019.9017390" target="_blank" >http://dx.doi.org/10.1109/PIERS-Spring46901.2019.9017390</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1109/PIERS-Spring46901.2019.9017390" target="_blank" >10.1109/PIERS-Spring46901.2019.9017390</a>

Result language

angličtina

Original language name

Features of Longitudinal Variations of Geomagnetic and Ionospheric Parameters during Severe Magnetic Storms in 2015

Original language description

The paper was carried out as a part of the project devoted to a comprehensive study of the longitudinal variations of the Earth's magnetic field in middle and high latitudes of the Northern hemisphere and related variations in the midlatitude ionosphere in disturbed and quiet geomagnetic conditions in 2011-2017. The analyzed period covers the years of growth, maximum and decline of the 24th cycle of solar activity. To study the geomagnetic field variations, data from the INTERMAGNET global network of magnetometers in the Northern hemisphere were used. In the analyzed time period 122 events of magnetic storms were identified: 102 moderate (-100 < Dst < -50 nT), 18 strong (-200 < Dst < -100 NT) and 2 severe (Dst < -200). A statistical analysis of the distribution of magnetic storms by years and seasons was performed. New interesting results are obtained on the irregular structure of the longitudinal variability of the geomagnetic field components in quiet conditions due to the discrepancy between the Northern geographical and geomagnetic poles, as well as the presence of anomalies of different spatial scales in the background magnetic field of the Earth. The longitudinal-temporal variations of the geomagnetic field components under disturbed conditions also show a strong dependence on the individual features of the magnetic storms. On the case study of the development of two severe magnetic storms in 2015, the longitudinal-temporal variations of the parameters of the midlatitude ionosphere over the Eurasian continent were analyzed based on the analysis of the ionosonde chain data. The presence of longitudinal features of the background structure and variations of the geomagnetic field leads to the fact that the registered ionospheric effects also exhibit a significant longitudinal inhomogeneity. We assume that the storm-associated ionosphere dynamics is determined by the lower thermosphere disturbances due to the auroral electrojet amplifications producing the enhanced neutral wind and turbulences: these, in turn, uplift the molecular gas to the ionospheric heights. This process decreases the [O]/[N-2] ratio and, consequently, the electron density.

Czech name

—

Czech description

—

Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

10509 - Meteorology and atmospheric sciences

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

2019 PHOTONICS & ELECTROMAGNETICS RESEARCH SYMPOSIUM - SPRING (PIERS-SPRING)

ISBN

978-1-7281-3403-1

ISSN

1559-9450

e-ISSN

—

Number of pages

9

Pages from-to

1840-1848

Publisher name

IEEE

Place of publication

New York

Event location

Rome

Event date

Jun 17, 2019

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

000550769301144