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The twin STEREO A and B spacecraft were launched in October 2006 into heliocentric orbits at around 1 AU, advancing ahead of or lagging behind Earth, respectively, at around 22 deg./year. The spacecraft provide in-situ observations of the…

太阳与恒星天体物理 · 物理学 2026-01-15 Ian G. Richardson , Tycho T. von Rosenvinge , O. Chris St. Cyr , David Lario , J. Grant Mitchell , Eric R. Christian

The multitude of recent multi-point spacecraft observations of solar energetic particle (SEP) events have made it possible to study the longitudinal distribution of SEPs in great detail. SEPs, even those accelerated during impulsive events,…

太阳与恒星天体物理 · 物理学 2018-04-12 R. D. Strauss , H. Fichtner

In its first encounter at solar distances as close as r = 0.16AU, Parker Solar Probe (PSP) observed numerous local reversals, or inversions, in the heliospheric magnetic field (HMF), which were accompanied by large spikes in solar wind…

太阳与恒星天体物理 · 物理学 2021-01-06 Allan R Macneil , Mathew J Owens , Robert T Wicks , Mike Lockwood

We investigate multi-spacecraft observations of the January 17, 2010 solar energetic particle event. Energetic electrons and protons have been observed over a remarkable large longitudinal range at the two STEREO spacecraft and SOHO…

太阳与恒星天体物理 · 物理学 2016-11-11 Nina Dresing , Raúl Gómez-Herrero , Andreas Klassen , Bernd Heber , Yulia Kartavykh , Wolfgang Dröge

We analyze measured proton and electron temperatures in the high-speed solar wind in order to calculate the separate rates of heat deposition for protons and electrons. When comparing with other regions of the heliosphere, the fast solar…

太阳与恒星天体物理 · 物理学 2015-05-13 Steven R. Cranmer , William H. Matthaeus , Benjamin A. Breech , Justin C. Kasper

We study the EUV/soft X-ray emission generated by charge transfer between solar wind heavy ions and interstellar H and He neutral atoms in the inner Heliosphere. We present heliospheric maps and spectra for stationary solar wind, depending…

天体物理学 · 物理学 2009-11-11 D. Koutroumpa , R. Lallement , V. Kharchenko , A. Dalgarno , R. Pepino , V. Izmodenov , E. Quémerais

Solar energetic particles in the heliosphere are produced by flaring processes on the Sun or shocks driven by coronal mass ejections. These particles are regularly detected remotely as electromagnetic radiation (X-rays or radio emission),…

Context. On 2022 January 20, the Energetic Particle Detector (EPD) on board Solar Orbiter measured a solar energetic particle (SEP) event showing unusual first arriving particles from the anti-Sun direction. Near-Earth spacecraft separated…

We explore the link between solar energetic particles (SEPs) observed at 1 AU and large-scale disturbances propagating in the solar corona, named after the Extreme ultraviolet Imaging Telescope (EIT) as EIT waves, which trace the lateral…

太阳与恒星天体物理 · 物理学 2015-06-18 R. Miteva , K. -L. Klein , I. Kienreich , M. Temmer , A. Veronig , O. E. Malandraki

Each of the two STEREO spacecraft carries a SEPT Instrument which measures electrons and protons. Anisotropy observations are provided in four viewing directions. The SEP event on 7 Nov 2013 was observed by both STEREO spacecraft, which…

Solar Energetic Particle (SEPs) with energies ranging from tens of keV to a few GeV, are a significant component in the description of the space environment. In this work, the HESPERIA REleASE product is emphasized, which, based on the…

太阳与恒星天体物理 · 物理学 2025-02-24 Olga Malandraki , Michalis Karavolos , Arik Posner , Kostas Tziotziou , Henrik Droege , Bernd Heber , Patrick Kuehl

Context/Aims: We present a list of 61 solar energetic electron (SEE) events measured by the MESSENGER mission and the radial dependences of the electron peak intensity and the peak-intensity energy spectrum. The analysis comprises the…

We study the large solar energetic particle (SEP) events that were detected by GOES in the $>$ 10 MeV energy channel during December 2006 to March 2014. We derive and compare solar particle release (SPR) times for the 0.25--10.4 MeV…

太阳与恒星天体物理 · 物理学 2016-10-26 Hong Xie , Pertti Makela , Nat Gopalswamy , Orville St. Cyr

We report results of a theoretical investigation of polarization of the X-ray emissions induced in charge-exchange collisions of fully stripped solar wind ions C$^{6+}$ and O$^{8+}$ with the heliospheric hydrogen atoms. The polarization of…

地球与行星天体物理 · 物理学 2013-11-14 Marko Gacesa , Hans-Reinhard Müller , Robin Côté , Vasili Kharchenko

The Solar Wind Electrons Alphas and Protons experiment on the Parker Solar Probe (PSP) mission measures the three-dimensional electron velocity distribution function. We derive the parameters of the core, halo, and strahl populations…

In the near future, Parker Solar Probe and Solar Orbiter will provide the first comprehensive in-situ measurements of the solar wind in the inner heliosphere since the Helios mission in the 1970s. We describe a reprocessing of the original…

太阳与恒星天体物理 · 物理学 2018-11-27 D. Stansby , C. S. Salem , L. Matteini , T. S. Horbury

Solar energetic particles (SEPs) affect the solar-terrestrial space environment and become a very important aspect in space weather research. In this work, we numerically investigate the transport processes of SEPs in three-dimensional…

太阳与恒星天体物理 · 物理学 2015-06-04 H. -Q. He , W. Wan

Solar energetic particles (SEPs), accelerated during solar eruptions, propagate in turbulent solar wind before being observed with in situ instruments. In order to interpret their origin through comparison with remote-sensing observations…

太阳与恒星天体物理 · 物理学 2020-01-08 T. Laitinen , S. Dalla

The Solar TErrestrial RElations Observatory (STEREO) provides high cadence and high resolution images of the structure and morphology of coronal mass ejections (CMEs) in the inner heliosphere. CME directions and propagation speeds have…

太阳与恒星天体物理 · 物理学 2015-03-31 Savani , N. P. , Davies , J. A. , Davis , C. J. , Shiota , D. , Rouillard , A. P. , Owens , M. J. , Kusano , K. , Bothmer , V. , Bamford , S. P. , Lintott , C. J. , Smith , A