1. [Tutorials] Energetic particles in Heliosphere This tutorial intends to introduce the basics of energetic particle, also reflect some recent aspects. I will maintain and update the content. All the comments and suggestions are welcome. Directly reply or send an email to guofan.ustc@gmail.com Recommended materials: Reames, D.V. 1999 Space Science Review link: http://adsabs.harvard.edu/abs/1999SSRv...90..413R Longair, M.S., High Energy Astrophysics: Volume 2 link: search on google book or buy online at amazon. ---- to be updated http://adsabs.harvard.edu/abs/2002SSRv..101....1A http://adsabs.harvard.edu/abs/2005ApJ...625..474T http://adsabs.harvard.edu/abs/2000ApJ...532L..79M http://adsabs.harvard.edu/abs/2000JGR...10525079Z http://adsabs.harvard.edu/abs/2006JGRA..11107S08B http://adsabs.harvard.edu/abs/2002ApJ...572L.103G http://adsabs.harvard.edu/abs/2005ApJS..158...38L http://adsabs.harvard.edu/abs/2003ApJ...588.1149D http://adsabs.harvard.edu/abs/2004ApJ...605..902C

郭帆 Posted at 2008-07-05 13:33 CST Last modified at 2010-12-25 07:38 CST Link to this poster Friendly Version Top

2. Overview 1 Spectrum of Energetic Particles (Oxygen nuclei, as an example) [img] |  height=300 width=500 align=left |../users/1166619430JDEkZkFCUjdjcTkkWnN5LjMvODQ0ZlFYT2dtZEtreWsyMQ/blog/20061227135711.353/materials/miniatures/20080705053620.993_m_dsc00002.jpg [/img] ESP - energetic storm particles: Particles with relatively low energies seen close to the shock region. SEP - solar energetic particles CIR particles - particles accelerated in corotating interaction region ACR anomalous cosmic rays - coming from the outer heliosphere, usually believed to be energized by termination shock GCR galactic cosmic rays - coming from outside of the solar system, believed to be accelerated by supernova remnants. The remarkable feature of cosmic rays (energetic charged particles) is that they appear to be power-law at high energy. [img] |  height=350 width=400 align=left |../users/1166619430JDEkZkFCUjdjcTkkWnN5LjMvODQ0ZlFYT2dtZEtreWsyMQ/blog/20061227135711.353/materials/miniatures/20080705053620.993_m_en_parts_helio.jpg [/img] Species and Sites: Most of energetic particles can be identified to be associated with shock waves. Solar energetic particles - coronal shocks (with particles from flares as a uncertainty) Energetic storm particles - interplanetary shocks or CIR shocks. anomalous cosmic rays - the termination shock galactic cosmic rays - supernova shock waves [1] [2] Download images (local images only) as a tar.gz pack: Full Size Small Size

郭帆 Posted at 2008-07-05 13:36 CST Last modified at 2010-12-25 07:47 CST Link to this poster Friendly Version Top

3. Overview 2 Energetic particles associated with CME. Remark: 1. CMEs produce highest energetic particles in heliosphere (sometimes ~10GeV) 2. The main accelerator is shocks driven by fast propagating CMEs. 3. Note the peak in energy flux associated with shock. 4. The standard acceleration mechanism is diffusive shock acceleration (DSA), sometimes called first-order Fermi process. [img]|height=350 align=left  |../users/1166619430JDEkZkFCUjdjcTkkWnN5LjMvODQ0ZlFYT2dtZEtreWsyMQ/blog/20061227135711.353/materials/miniatures/20080705190535.485_m_cme%26seps1.jpg [/img] [1]

郭帆 Posted at 2008-07-06 03:05 CST Last modified at 2008-07-11 08:51 CST Link to this poster Friendly Version Top

4. Overview 3 * 1. Particle acceleration in flares producing bremsstrahlung emission Remarks: a. Acceleration of particles in flares is not well understood. Shocks, reconnections and waves (stochastic process) may all play certain role. b. Note distinct components of emission produced by thermal (in loops) and non-thermal (at footpoints) bremsstrahlung. [img]|align=left height=300|../users/1166619430JDEkZkFCUjdjcTkkWnN5LjMvODQ0ZlFYT2dtZEtreWsyMQ/blog/20061227135711.353/materials/miniatures/20080706170249.198_m_flare%26seps1.jpg [/img] * 2. Some of particles can escape into interplanetary space [img]|align=left height=300|../users/1166619430JDEkZkFCUjdjcTkkWnN5LjMvODQ0ZlFYT2dtZEtreWsyMQ/blog/20061227135711.353/materials/miniatures/20080706170249.198_m_flare%26sep2.jpg[/img] [1] [2] Download images (local images only) as a tar.gz pack: Full Size Small Size

郭帆 Posted at 2008-07-07 01:02 CST Last modified at 2008-07-11 08:10 CST Link to this poster Friendly Version Top

5. Overview 4 Particle acceleration in CIRs a. CIRs are formed due to fast stream of solar wind pursuing slow wind. b. Shocks again dominate the acceleration process in CIRs [img] | height=300 width=400 align=left |../users/1166619430JDEkZkFCUjdjcTkkWnN5LjMvODQ0ZlFYT2dtZEtreWsyMQ/blog/20061227135711.353/materials/miniatures/20080706182556.803_m_cir%26seps.jpg [/img] [1]

郭帆 Posted at 2008-07-07 02:25 CST Last modified at 2008-07-11 08:16 CST Link to this poster Friendly Version Top

6. Overview 5 * Anomalous Cosmic Rays. Most people believe anomalous cosmic rays are pickup ions accelerated at termination shock by diffusive acceleration process. However, Voyager 1 and Voyager 2 didn't see ACR peaks at termination shock, which indicates current theory need to be revised. A major idea is that one has to consider temporal variation or spatial variation in diffusive shock acceleration (Florinski & Zank 2005, Schwadron & McComas 2006, Kota & Jokipii 2008, Jokipii & Kota 2008, Guo, Jokipii & Kota 2010). Other ideas include stochastic acceleration (Fisk & Gloecker) and particle acceleration at reconnection site (Drake & Opher; Lazarian & Opher) See pictures in[url] Overview 1 |../forum/index.php?entrance=1166619430JDEkZkFCUjdjcTkkWnN5LjMvODQ0ZlFYT2dtZEtreWsyMQ&section=blog&board=20061227135711.353&sortkind=lastre&poster=20080705053339.996&ssc=0#p20080705053339[/url] for a first sense. * Galactic Cosmic Rays (GCR) Supernova Remnants are thought to be the main source of GCR. [1]

郭帆 Posted at 2008-07-07 03:08 CST Last modified at 2010-12-25 16:43 CST Link to this poster Friendly Version Top