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Interplanetary coronal mass ejection observed at STEREO-A, Mars, comet 67P/Churyumov-Gerasimenko, Saturn, and New Horizons en route to Pluto: Comparison of its Forbush decreases at 1.4, 3.1, and 9.9 AU
Barabash, S.; Krupp, N.; Roussos, E. +48 more
We discuss observations of the journey throughout the Solar System of a large interplanetary coronal mass ejection (ICME) that was ejected at the Sun on 14 October 2014. The ICME hit Mars on 17 October, as observed by the Mars Express, Mars Atmosphere and Volatile EvolutioN Mission (MAVEN), Mars Odyssey, and Mars Science Laboratory (MSL) missions,…
Understanding the Physical Nature of Coronal "EIT Waves"
Long, D. M.; Veronig, A. M.; Vršnak, B. +9 more
For almost 20 years the physical nature of globally propagating waves in the solar corona (commonly called "EIT waves") has been controversial and subject to debate. Additional theories have been proposed over the years to explain observations that did not agree with the originally proposed fast-mode wave interpretation. However, the incompatibili…
Estimation of a coronal mass ejection magnetic field strength using radio observations of gyrosynchrotron radiation
Carley, Eoin P.; Vilmer, Nicole; Simões, Paulo J. A. +1 more
Coronal mass ejections (CMEs) are large eruptions of plasma and magnetic field from the low solar corona into interplanetary space. These eruptions are often associated with the acceleration of energetic electrons which produce various sources of high intensity plasma emission. In relatively rare cases, the energetic electrons may also produce gyr…
Multi-instrument observations of the solar eclipse on 20 March 2015 and its effects on the ionosphere over Belgium and Europe
De Keyser, Johan; Berghmans, David; West, Matthew J. +19 more
A total solar eclipse occurred on 20 March 2015, with a totality path passing mostly above the North Atlantic Ocean, which resulted in a partial solar eclipse over Belgium and large parts of Europe. In anticipation of this event, a dedicated observational campaign was set up at the Belgian Solar-Terrestrial Centre of Excellence (STCE). The objecti…
Identification of Low Coronal Sources of “Stealth” Coronal Mass Ejections Using New Image Processing Techniques
Morgan, Huw; Alzate, Nathalia
Coronal mass ejections (CMEs) are generally associated with low coronal signatures (LCSs), such as flares, filament eruptions, extreme ultraviolet (EUV) waves, or jets. A number of recent studies have reported the existence of stealth CMEs as events without LCSs, possibly due to observational limitations. Our study focuses on a set of 40 stealth C…
Solar signatures and eruption mechanism of the August 14, 2010 coronal mass ejection (CME)
Poedts, Stefaan; Berghmans, David; Seaton, Daniel B. +2 more
On August 14, 2010 a wide-angled coronal mass ejection (CME) was observed. This solar eruption originated from a destabilized filament that connected two active regions and the unwinding of this filament gave the eruption an untwisting motion that drew the attention of many observers. In addition to the erupting filament and the associated CME, se…
Segmentation of photospheric magnetic elements corresponding to coronal features to understand the EUV and UV irradiance variability
Giono, G.; Zender, J. J.; Kariyappa, R. +5 more
Context. The magnetic field plays a dominant role in the solar irradiance variability. Determining the contribution of various magnetic features to this variability is important in the context of heliospheric studies and Sun-Earth connection.
Aims: We studied the solar irradiance variability and its association with the underlying magnetic fi…
Vertical Thermospheric Density Profiles From EUV Solar Occultations Made by PROBA2 LYRA for Solar Cycle 24
Dominique, M.; Eparvier, F. G.; Thiemann, E. M. B. +1 more
A new data set of summed neutral N2 and O number density profiles, spanning altitudes between 150 and 400 km, and observed during Northern Winter from 2010 to 2016 is presented. The neutral density profiles are derived from solar occultation measurements made by the 0.1-20 nm Zr channel on the Large Yield Radiometer (LYRA) instrument on…
Study of the early phase of a Coronal Mass Ejection driven shock in EUV images
Susino, Roberto; Frassati, Federica; Mancuso, Salvatore +1 more
The November 1st, 2014 prominence eruption (associated with a C2.7 class flare) resulted in a fast, partial-halo Coronal Mass Ejection (CME). During its early propagation, the CME produced a type II radio burst (seen by the Bruny Island Radio Spectrometer) starting around 04:57 UT when the front entered into the LASCO/C2 field of view (FOV) and th…