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Excess H, Suppressed He, and the Abundances of Elements in Solar Energetic Particles
Reames, Donald V.
Recent studies of the abundances of H and He relative to those of heavier ions in solar energetic particle (SEP) events suggest new features in the underlying physics. Impulsive SEP events, defined by uniquely large enhancements of Fe/O, emerge from magnetic reconnection in solar jets. In small, "pure," shock-free, impulsive SEP events, protons wi…
New Evidence for Third Harmonic Electromagnetic Radiation in Interplanetary Type III Solar Radio Bursts
MacDowall, R. J.; Reiner, M. J.
This article provides new evidence for a third harmonic component in the electromagnetic radiation generated by interplanetary type III solar radio bursts observed locally near 1 AU. This evidence comes mainly from the analysis of the low-frequency radio emissions observed by the Wind spacecraft. The analysis examines, at high-time and high-freque…
Modeling the Global Distribution of Solar Wind Parameters on the Source Surface Using Multiple Observations and the Artificial Neural Network Technique
Shen, Fang; Yang, Yi
The global distribution of magnetic field and other plasma parameters on the source surface, which we set at 2.5 solar radii, is important for coronal and heliospheric modeling. In this article, we introduce a new data-driven self-consistent method to obtain the global distribution of different parameters. The magnetic and polarized brightness (p …
Estimation of Arrival Time of Coronal Mass Ejections in the Vicinity of the Earth Using SOlar and Heliospheric Observatory and Solar TErrestrial RElations Observatory Observations
Ravishankar, Anitha; Michałek, Grzegorz
The arrival time of coronal mass ejections (CMEs) in the vicinity of the Earth is one of the most important parameters in determining space weather. We have used a new approach to predicting this parameter. First, in our study, we have introduced a new definition of the speed of ejection. It can be considered as the maximum speed that the CME achi…
Coordinated Interplanetary Scintillation Observations in Japan and Russia for Coronal Mass Ejection Events in Early September 2017
Tokumaru, Munetoshi; Fujiki, Ken'ichi; Iwai, Kazumasa +2 more
Interplanetary (IP) shocks traveling between the Sun and the Earth's orbit were clearly detected in interplanetary scintillation (IPS) observations made at Toyokawa (Japan) and Pushchino (Russia), in association with two halo coronal mass ejections (CMEs) that occurred on 04 and 06 September 2017. Since the observation times at Toyokawa and Pushch…
Characteristics of the Solar Coronal Line Profiles from Fabry-Perot Interferometric Observations
Chandrasekhar, T.; Raju, K. P.; Prabhakar, Maya
This article reports the analysis of a set of Fabry-Perot interferograms that were studied to probe the physical parameters of the inner solar corona. The observations were carried out in the coronal green line, Fe XIV 5302.86 Å, during the total solar eclipse of 21 June 2001 that occurred in Lusaka, Zambia. The study was performed in the radial r…
Analysis of Quiescent Corona X-ray Spectra from SphinX During the 2009 Solar Minimum
Phillips, K. J. H.; Sylwester, B.; Sylwester, J. +3 more
The SphinX X-ray spectrophotometer on the CORONAS-PHOTON mission observed the 1 - 15 keV X-ray spectrum of the spatially integrated solar corona during the deep minimum of 2009, when solar activity was exceptionally low. Its sensitivity for energies >1.2 keV was higher than that of any other solar X-ray spectrometer in orbit at the time, includ…
Observations of a Flare-Generated Blast Wave in a Pseudo Coronal Mass Ejection Event
Zimovets, I. V.; Eselevich, M. V.; Eselevich, V. G.
We present an analysis of the event near the east limb, SOL2014-03-06T09:23, in which a pseudo coronal mass ejection (CME) was detected by the Large Angle and Spectrometric Coronagraph (LASCO) C2 instrument and indicated as "Poor Event; Only C2" in the Solar and Heliospheric Observatory (SOHO) LASCO CME Catalog. The analysis was performed based on…
Tomography of the Solar Corona with the Wide-Field Imager for the Parker Solar Probe
Vourlidas, Angelos; Howard, Russell A.; van der Holst, Bart +4 more
The Wide-field Imager for the Parker Solar Probe (PSP/WISPR) comprises two telescopes that record white-light total brightness [B ] images of the solar corona. Their fields of view cover a widely changing range of heliocentric heights over the 24 highly eccentric orbits planned for the mission. In this work, the capability of PSP/WISPR data to car…
Validation of MHD Model Predictions of the Corona with LASCO-C2 Polarized Brightness Images
Riley, Pete; Lamy, Philippe; Mikić, Zoran +1 more
Progress in our understanding of the solar corona requires that the results of advanced magnetohydrodynamic models driven by measured magnetic fields, and particularly the underlying heating models, be thoroughly compared with coronal observations. The comparison has so far mainly concerned the global morphology of the corona, synthetic images cal…