The almost monoenergetic ion event on 19 October 2009: SEPT/STEREO observations

Klassen, A.; Gómez-Herrero, R.; Müller‐Mellin, R.; Heber, B.; Wimmer‐Schweingruber, R. F.; Opitz, A.; Sauvaud, J. A.

doi:10.1051/0004-6361/201014563

Cited by 2 publications

(1 citation statement)

References 21 publications

(24 reference statements)

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“…[] reported the detection of a special kind of energetic particle event by STEREO close to Earth's bow shock, the so‐called almost monoenergetic ion (AMI) events, showing an energy spectrum containing one or more narrow peaks with a relative full width half at maximum of 0.1–0.7 [see also Lutsenko and Kudela , ], in contrast with the typical upstream events showing a power law energy distribution. Similar AMI events were observed far away from the Earth, so they seem to be also present during passages of interplanetary shocks [ Klassen et al ., ].…”

Section: Introductionmentioning

confidence: 99%

Solar wind control of the terrestrial magnetotail as seen by STEREO

et al. 2014

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At the beginning of 2007 the twin STEREO spacecraft provided a unique opportunity to study the global solar wind control of the terrestrial magnetotail under typical solar activity minimum conditions. The STEREO-B (STB) spacecraft flew in the vicinity of the far terrestrial magnetotail, while the STEREO-A (STA) spacecraft was located in front of the Earth performing measurements in the undisturbed solar wind. In February, the STB spacecraft was located in the magnetosheath most of the time but experienced several incursions into the distant magnetotail. Comparison of STA and STB observations determines unambiguously whether solar wind events such as energetic particle enhancements observed by STB are of pure solar origin or due to the influence of the terrestrial magnetosphere. During this time period in 2007, there were solar minimum conditions with alternating fast and slow solar wind streams that formed corotating interaction regions, which were the dominating source of magnetospheric disturbances encountering the Earth almost every week. Under these conditions, STB experienced multiple bow shock and magnetopause crossings due to the induced highly dynamic behavior of the terrestrial magnetotail and detected bursts of tailward directed energetic ions in the range of 110-2200 keV accompanied by suprathermal electrons of~700-1500 eV, which were not seen in the undisturbed solar wind by STA. The corotating interaction regions triggered these energetic particle enhancements, and we demonstrate their magnetosphere-related origin. Even after leaving the magnetosheath in March 2007, STB continued to observe antisunward directed energetic ion bursts until May up to a distance of~800 R E behind Earth, the largest distance to which solar wind and magnetospheric interaction has been observed. These results show that Earth is a very significant source of energetic particles in its local interplanetary environment.

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Section: Introductionmentioning

confidence: 99%

Solar wind control of the terrestrial magnetotail as seen by STEREO

et al. 2014

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Multiple injections of energetic electrons associated with the flare and CME event on 9 October 2021

Jebaraj¹,

Kouloumvakos²,

Dresing³

et al. 2023

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Context. We study the solar energetic particle (SEP) event observed on 9 October 2021 by multiple spacecraft, including Solar Orbiter. The event was associated with an M1.6 flare, a coronal mass ejection, and a shock wave. During the event, high-energy protons and electrons were recorded by multiple instruments located within a narrow longitudinal cone. Aims. An interesting aspect of the event was the multi-stage particle energisation during the flare impulsive phase and also what appears to be a separate phase of electron acceleration detected at Solar Orbiter after the flare maximum. We aim to investigate and identify the multiple sources of energetic electron acceleration. Methods. We utilised SEP electron observations from the Energetic Particle Detector (EPD) and hard X-ray (HXR) observations from the Spectrometer/Telescope for Imaging X-rays (STIX) on board Solar Orbiter, in combination with radio observations at a broad frequency range. We focused on establishing an association between the energetic electrons and the different HXR and radio emissions associated with the multiple acceleration episodes. Results. We find that the flare was able to accelerate electrons for at least 20 min during the non-thermal phase, observed in the form of five discrete HXR pulses. We also show evidence that the shock wave contributed to the electron acceleration during and after the impulsive flare phase. The detailed analysis of EPD electron data shows that there was a time difference in the release of low- and high-energy electrons, with the high-energy release delayed. Also, the observed electron anisotropy characteristics suggest a different connectivity during the two phases of acceleration.

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The almost monoenergetic ion event on 19 October 2009: SEPT/STEREO observations

Cited by 2 publications

References 21 publications

Solar wind control of the terrestrial magnetotail as seen by STEREO

Solar wind control of the terrestrial magnetotail as seen by STEREO

Multiple injections of energetic electrons associated with the flare and CME event on 9 October 2021

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