Výsledky vyhledávání - "Abiyot Workayehu"

Field‐Aligned and Ionospheric Currents by AMPERE and SuperMAG During HSS/SIR‐Driven Storms

Autor: Marcus Pedersen, Jesper Gjerloev, Anita Aikio, C. L. Waters, Heikki Vanhamäki, Abiyot Workayehu, Sebastian Käki

Publikováno v: e2021JA029437
Journal of Geophysical Research (JGR): Space Physics

This study considers 28 geomagnetic storms with Dst $\leq-50$ nT driven by high-speed streams (HSSs) and associated stream interaction regions (SIRs) during 2010-2017. Their impact on ionospheric horizontal and field-aligned currents (FACs) have been

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::34589123fc78385b241946095cc403c7
https://doi.org/10.1029/2021ja029437

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Effect of interplanetary magnetic field on hemispheric asymmetry in ionospheric horizontal and field-aligned currents during different seasons

Autor: Abiyot Workayehu, Anita Aikio, Heikki Vanhamäki, Simon G. Shepherd

We present a statistical investigation of the effects of interplanetary magnetic field (IMF) on hemispheric asymmetry in auroral currents. Nearly six years of magnetic field measurements from Swarm...

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::adec825ee672d92c389272c460ae58c1
https://doi.org/10.1002/essoar.10506875.1

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Seasonal, Kp and IMF dependence of hemispheric asymmetry in ionospheric horizontal and field-aligned currents

Autor: Heikki Vanhamäki, Simon G. Shepherd, Anita Aikio, Abiyot Workayehu

We present statistical investigation of the seasonal, geomagnetic activity and interplanetary magnetic field (IMF) dependence of hemispheric asymmetry in the auroral currents. Magnetic data from the Swarm satellites has been analyzed by applying the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b777928c0415d2f1ed61b19762e13bb7
https://doi.org/10.5194/egusphere-egu21-9697

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Impact of Solar Wind High Speed Streams on Ionospheric Current Systems

Autor: Marcus Pedersen, Heikki Vanhamäki, Anita Aikio, Sebastian Käki, Ari Viljanen, Abiyot Workayehu, Colin Waters, Jesper Gjerloev

High speed streams (HSS) and associated co-rotating interaction regions (CIR) in the solar wind are one of the major drivers of geomagnetic activity, especially during declining phases of sunspot cycles and near sunspot minima. We have identified 51

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::41336886cd20530adde8f869e750d90b
https://doi.org/10.5194/egusphere-egu2020-18592

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Hemispheric asymmetry in field-aligned and ionospheric horizontal currents from the Swarm satellite measurements

Autor: Abiyot Workayehu, Heikki Vanhamäki, Anita Aikio

We present statistical investigation of the high-latitude ionospheric current systems in the Northern hemisphere (NH) and Southern hemisphere (SH) during low (Kp < 2) and high (Kp ≥ 2) geomagnetic activity levels. Nearly four years of vector magnet

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cb699437750fa2fadf052c148e76a145
https://doi.org/10.5194/egusphere-egu2020-9644

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Swarm Satellite and EISCAT Radar Observations of a Plasma Flow Channel in the Auroral Oval Near Magnetic Midnight

Autor: Kirsti Kauristie, Ilkka Virtanen, Abiyot Workayehu, Anita Aikio, Liisa Juusola, David J. Knudsen, Stephan Buchert, Heikki Vanhamäki

Publikováno v: Journal of Geophysical Research: Space Physics. 123:5140-5158

We present Swarm satellite and EISCAT radar observations of electrodynamical parameters in the midnight sector at high latitudes. The most striking feature is a plasma flow channel located equatorw ...

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2f08eec3b50fdb9da0db597bc8f9051e
https://doi.org/10.1029/2018ja025409

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