Search Publications
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…
Neural Network for Solar Irradiance Modeling (NN-SIM)
Mauceri, Steffen; Coddington, Odele; Lyles, Danielle +1 more
An understanding of solar variability over a broad range of wavelengths and timescales is needed by scientists studying Earth's climate. While the current understanding of solar irradiance from measurements and models is maturing, there remain notable areas of discrepancy that highlight a lack of understanding of the variability in solar spectral …
Can High-Mode Magnetohydrodynamic Waves Propagating in a Spinning Macrospicule Be Unstable Due to the Kelvin-Helmholtz Instability?
Zhelyazkov, I.; Chandra, R.
We investigate the conditions at which high-mode magnetohydrodynamic (MHD) waves propagating in a spinning solar macrospicule can become unstable with respect to the Kelvin-Helmholtz instability (KHI). We consider the macrospicule as a weakly twisted cylindrical magnetic flux tube moving along and rotating around its axis. Our study is based on th…
Polarimetric Reconstruction of Coronal Mass Ejections from LASCO-C2 Observations
Lamy, Philippe; Floyd, Olivier
The three-dimensional morphology and direction of propagation of coronal mass ejections (CMEs) are essential information for identifying their source on the solar disk, for understanding the processes of their ejection and propagation in the corona, and for forecasting their possible impact with the Earth or any other objects in the solar system. …
Onset of a CME-Related Shock Within the Large-Angle Spectrometric Coronagraph (LASCO) Field of View
Fainshtein, V. G.; Egorov, Y. I.
We investigated the onset of a CME-related shock within the Large-Angle Spectrometric Coronagraph (LASCO) field of view (FOV). To detect the first moment of the shock onset, we found a CME on 17 July 2012 that formed at a relatively high altitude and moved with slow acceleration. We examined the possible mechanisms of shock generation. It was show…
Study of Interplanetary CMEs/Shocks During Solar Cycle 24 Using Drag-Based Model: The Role of Solar Wind
Shanmugaraju, A.; Vršnak, Bojan; Suresh, K. +2 more
In this paper we analyze a set of 27 fast interplanetary coronal mass ejections (ICMEs) observed during the period January 2010 - December 2013 in Solar Cycle 24. The arrivals of interplanetary shocks and CMEs at 1 AU are found from OMNI spacecraft high resolution data and their travel times are compared with Empirical Shock Arrival (ESA; Gopalswa…
Comprehensive Determination of the Hinode/EIS Roll Angle
Warren, Harry P.; Brooks, David H.; Baker, Deborah +5 more
We present a new coalignment method for the EUV Imaging Spectrometer (EIS) on board the Hinode spacecraft. In addition to the pointing offset and spacecraft jitter, this method determines the roll angle of the instrument, which has never been systematically measured, and which is therefore usually not corrected. The optimal pointing for EIS is com…