Search Publications
The Solar Event of 14 - 15 July 2012 and Its Geoeffectiveness
Gil, Agnieszka; Modzelewska, Renata; Moskwa, Szczepan +5 more
During Solar Cycle 24, which started at the end of 2008, the Sun was calm, and there were not many spectacular geoeffective events. In this article, we analyze the geomagnetic storm that happened on 15 July 2012 during the 602nd anniversary of the Polish Battle of Grunwald, thus we propose this event to be called the "Battle of Grunwald Day Storm"…
Temporal and Spatial Scales in Coronal Rain Revealed by UV Imaging and Spectroscopic Observations
Toriumi, Shin; Antolin, Patrick; Katsukawa, Yukio +1 more
Coronal rain corresponds to cool and dense clumps in the corona accreting towards the solar surface; it is often observed above solar active regions. These clumps are generally thought to be produced by a thermal instability in the corona and their lifetime is limited by the time they take to reach the chromosphere. Although the rain usually fragm…
Comprehensive Characterization of Solar Eruptions with Remote and In-Situ Observations, and Modeling: The Major Solar Events on 4 November 2015
Veronig, Astrid M.; Nitta, Nariaki V.; Dresing, Nina +12 more
Solar energetic particles (SEPs) are an important product of solar activity. They are connected to solar active regions and flares, coronal mass ejections (CMEs), EUV waves, shocks, Type II and III radio emissions, and X-ray bursts. These phenomena are major probes of the partition of energy in solar eruptions, as well as for the organization, dyn…
A Non-Linear Magnetic Field Calibration Method for Filter-Based Magnetographs by Multilayer Perceptron
Ji, Kaifan; Su, Jiangtao; Deng, Yuanyong +5 more
For filter-based magnetographs, the linear calibration method under the weak-field assumption is usually adopted; this leads to magnetic saturation effect in the regions with strong magnetic field. This article explores a new method to overcome the above disadvantage using a multilayer perceptron network, which we call MagMLP, based on a back-prop…
CME Productive and Non-productive Recurring Jets Near an Active Region AR11176
Srivastava, Abhishek K.; Dwivedi, Bhola N.; Solanki, Ritika
We study the recurring jets near AR11176 during the period 2011 March 31 17:00 UT to April 1 05:00 UT using observations from the Atmospheric Imaging Assembly (AIA) on board Solar Dynamics Observatory (SDO). Mini-filaments (mini-filament1 & 2) are found at the base of these recurring jets where mini-filament1 shows the partial signature of eru…
CMEchaser, Detecting Line-of-Sight Occultations Due to Coronal Mass Ejections
Zucca, Pietro; Shaifullah, Golam; Tiburzi, Caterina
We present a python-based tool to detect the occultation of back-ground sources by foreground solar coronal mass ejections. The tool takes as input standard celestial coordinates of the source and translates those to the helioprojective plane, and is thus well suited for use with a wide variety of background astronomical sources. This tool provide…
A Geoeffective CME Caused by the Eruption of a Quiescent Prominence on 29 September 2013
Grechnev, V. V.; Kuzmenko, I. V.
The eruption of a large prominence that occurred away of active regions in the SOL2013-09-29 event produced a fast coronal mass ejection (CME) and a shock wave. The event caused considerable geospace disturbances, including a proton enhancement that have been addressed in previous studies. Continuing with the analysis of this event, we focus on th…
Locating Hot Plasma in Small Flares using Spectroscopic Overlappogram Data from the Hinode EUV Imaging Spectrometer
Reeves, Katharine K.; Lee, Kyoung-Sun; Hara, Hirohisa +6 more
One of the key processes associated with the "standard" flare model is chromospheric evaporation, a process during which plasma heated to high temperatures by energy deposition at the flare footpoints is driven upwards into the corona. Despite several decades of study, a number of open questions remain, including the relationship between plasma pr…
Solar Total Eclipse of 21 August 2017: Study of the Inner Corona Dynamical Events Leading to a CME
Filippov, Boris; Koutchmy, Serge; Lefaudeux, Nicolas
Total solar eclipse (TSE) coronal large- and small-scale events were reported in the historical literature but a definite synoptic coverage was missing for studying a relationship with the more general magnetic context of the solar-disk. We here analyze temporal changes in the solar corona before, during, and after the total solar eclipse on 21 Au…
The LASCO Coronal Brightness Index
Howard, Russell A.; Battams, Karl; Lean, Judith L. +2 more
We present the construction of a new white-light coronal brightness index (CBI) from the entire archive of observations recorded by the Large Angle Spectrometric Coronagraph (LASCO) C2 camera between 1996 and 2017, comprising two full solar cycles. We reduce all fully calibrated daily C2 observations of the white-light corona into a single daily c…