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Solar Eruptions, Forbush Decreases, and Geomagnetic Disturbances From Outstanding Active Region 12673
Chertok, I. M.; Belov, A. V.; Abunin, A. A.
Based on our tool for the early diagnostics of solar eruption geoeffectiveness (EDSEG tool; Chertok et al., 2013, https://doi.org/10.1007/s11207-012-0127-1; 2015, https://doi.org/10.1007/s11207-014-0618-3; 2017,
Ionospheric Responses to CME- and CIR-Driven Geomagnetic Storms Along 30°E-40°E Over the African Sector From 2001 to 2015
Matamba, Tshimangadzo Merline; Habarulema, John Bosco
In this paper, we present the responses of the ionospheric total electron content (TEC) to coronal mass ejection (CME)- and corotating interaction region (CIR)-driven storms using stations that lie within 30°E-40°E geographic longitude in middle, low, and equatorial latitudes over the African sector. CIR-driven storms are generally weak (-50 nT &l…
O+ Escape During the Extreme Space Weather Event of 4-10 September 2017
Nilsson, Hans; Dandouras, Iannis; Slapak, Rikard +5 more
We have investigated the consequences of extreme space weather on ion outflow from the polar ionosphere by analyzing the solar storm that occurred early September 2017, causing a severe geomagnetic storm. Several X-flares and coronal mass ejections were observed between 4 and 10 September. The first shock—likely associated with a coronal mass ejec…
Empirical Modeling of the Quiet and Storm Time Geosynchronous Magnetic Field
Tsyganenko, N. A.; Andreeva, V. A.
A dynamical empirical model of the near-geosynchronous magnetic field has been constructed, based on a recently developed radial basis functions approach and a multiyear set of spacecraft data taken by Time History of Events and Macroscale Interactions during Substorms (THEMIS), Polar, Cluster, and Van Allen Probes missions including 133 geomagnet…
Solar EUV Flux Proxy Using Multifrequency Solar Radio Flux
Zhang, Yongliang; Paxton, Larry J.
We report a new solar extreme ultraviolet (EUV; 26-34 nm) proxy using solar radio fluxes at six different frequencies (410; 610; 1,415; 2,695; 4,995; and 8,800 MHz) from ground-based observations. The radio fluxes (2002-2008) are used to estimate the solar EUV flux under nonsolar flare conditions through an artificial neural network trained with c…
Statistical Similarities Between WSA-ENLIL+Cone Model and MAVEN in Situ Observations From November 2014 to March 2016
Baker, D. N.; Halekas, J. S.; Lee, C. O. +4 more
Normal solar wind flows and intense solar transient events interact directly with the upper Martian atmosphere due to the absence of an intrinsic global planetary magnetic field. Since the launch of the Mars Atmosphere and Volatile EvolutioN (MAVEN) mission, there are now new means to directly observe solar wind parameters at the planet's orbital …
Solar Sources of Interplanetary Magnetic Clouds Leading to Helicity Prediction
Riley, Pete; Ulrich, Roger K.; Tran, T.
This study identifies the solar origins of magnetic clouds that are observed at 1 AU and predicts the helical handedness of these clouds from the solar surface magnetic fields. We started with the magnetic clouds listed by the Magnetic Field Investigation (MFI) team supporting NASA's Wind spacecraft in what is known as the MFI table and worked bac…