arXiv - PHYS - Space Physics最新文献_第4页

An efficient, time-evolving, global MHD coronal model based on COCONUT 基于 COCONUT 的高效、随时间演变的全球 MHD 日冕模型

arXiv - PHYS - Space Physics Pub Date : 2024-09-03 DOI: arxiv-2409.02043

H. P. Wang, S. Poedts, A. Lani, M. Brchnelova, T. Baratashvili, L. Linan, F. Zhang, D. W. Hou, Y. H. Zhou

{"title":"An efficient, time-evolving, global MHD coronal model based on COCONUT","authors":"H. P. Wang, S. Poedts, A. Lani, M. Brchnelova, T. Baratashvili, L. Linan, F. Zhang, D. W. Hou, Y. H. Zhou","doi":"arxiv-2409.02043","DOIUrl":"https://doi.org/arxiv-2409.02043","url":null,"abstract":"MHD coronal models are critical in the Sun-to-Earth model chain and the most\u0000complex and computationally intensive component, particularly the time-evolving\u0000coronal models, typically driven by a series of time-evolving photospheric\u0000magnetograms. There is an urgent need to develop efficient and reliable\u0000time-evolving MHD coronal models to further improve our ability to predict\u0000space weather. COCONUT is a rapidly developing MHD coronal model. Adopting the\u0000efficient implicit algorithm makes it suitable for performing computationally\u0000intensive time-evolving coronal simulations. This paper aims to extend COCONUT\u0000to an efficient time-evolving MHD coronal model. In this MHD model, as usual,\u0000an implicit temporal integration algorithm is adopted to avoid the CFL\u0000stability restriction and increase computational efficiency by large time\u0000steps. The Newton iteration method is applied within each time step to enhance\u0000the temporal accuracy. The unstructured geodesic mesh is used for flexibility\u0000in mesh division and to avoid degeneracy at the poles. Furthermore, an HLL\u0000Riemann solver with a self-adjustable dissipation term accommodates both low-\u0000and high-speed flows. A series of time-evolving photospheric magnetograms are\u0000utilized to drive the evolution of coronal structures from the solar surface to\u000025Rs during two Carrington rotations (CRs) around the 2019 eclipse in an\u0000inertial coordinate system. It shows that COCONUT can mimic the coronal\u0000evolution during a full CR within 9 hours (1080 CPU cores, 1.5M cells). We also\u0000compare the simulation results of time-evolving versus quasi-steady-state\u0000coronal simulations in the thermodynamic MHD model to validate the\u0000time-evolving approach. Additionally, we evaluate the effect of time steps on\u0000the simulation results to find an optimal time step that simultaneously\u0000maintains high efficiency and necessary numerical stability and accuracy.","PeriodicalId":501423,"journal":{"name":"arXiv - PHYS - Space Physics","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142223600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effective dose equivalent estimation for humans on Mars 人类在火星上的有效剂量当量估算

arXiv - PHYS - Space Physics Pub Date : 2024-09-03 DOI: arxiv-2409.02001

Miguel Ralha, Pedro Teles, Nuno Santos, Daniel Matthiä, Thomas Berger, Marta Cortesão

引用次数: 0

SIP-IFVM: An efficient time-accurate implicit MHD model of corona and CME with strong magnetic field SIP-IFVM：具有强磁场的日冕和 CME 的高效时间精确隐式 MHD 模型

arXiv - PHYS - Space Physics Pub Date : 2024-09-03 DOI: arxiv-2409.02022

H. P. Wang, J. H. Guo, L. P. Yang, S. Poedts, F. Zhang, A. Lani, T. Baratashvili, L. Linan, R. Lin, Y. Guo

{"title":"SIP-IFVM: An efficient time-accurate implicit MHD model of corona and CME with strong magnetic field","authors":"H. P. Wang, J. H. Guo, L. P. Yang, S. Poedts, F. Zhang, A. Lani, T. Baratashvili, L. Linan, R. Lin, Y. Guo","doi":"arxiv-2409.02022","DOIUrl":"https://doi.org/arxiv-2409.02022","url":null,"abstract":"CMEs are one of the main drivers of space weather. However, robust and\u0000efficient numerical modeling of the initial stages of CME propagation and\u0000evolution process in the sub-Alfvenic corona is still lacking. Based on the\u0000highly efficient quasi-steady-state implicit MHD coronal model (Feng et al.\u00002021; Wang et al. 2022a), we further develop an efficient and time-accurate\u0000coronal model and employ it to simulate the CME's evolution and propagation. A\u0000pseudo-time marching method, where a pseudo time, tau, is introduced at each\u0000physical time step to update the solution by solving a steady-state problem on\u0000tau, is devised to improve the temporal accuracy. Moreover, an RBSL flux rope\u0000whose axis can be designed in an arbitrary shape is inserted into the\u0000background corona to trigger the CME event. We call it the SIP-IFVM coronal\u0000model and utilize it to simulate a CME evolution process from the solar surface\u0000to 20 Rs in the background corona of CR 2219. It can finish the CME simulation\u0000covering 6 hours of physical time by less than 0.5 hours (192 CPU cores, 1 M\u0000cells) without much loss in temporal accuracy. Besides, an ad hoc simulation\u0000with initial magnetic fields artificially increased shows that this model can\u0000effectively deal with time-dependent low-beta problems (beta<0.0005).\u0000Additionally, an Orszag-Tang MHD vortex flow simulation demonstrates that the\u0000pseudo-time-marching method adopted in this coronal model is also capable of\u0000simulating small-scale unsteady-state flows. The simulation results show that\u0000this MHD coronal model is very efficient and numerically stable and is\u0000promising to timely and accurately simulate time-varying events in solar corona\u0000with low plasma beta.","PeriodicalId":501423,"journal":{"name":"arXiv - PHYS - Space Physics","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142223601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Derivation of generalized Kappa distribution from scaling properties of solar wind magnetic field fluctuations at kinetic scales 从太阳风磁场波动在动力学尺度上的缩放特性推导广义卡帕分布

arXiv - PHYS - Space Physics Pub Date : 2024-09-03 DOI: arxiv-2409.01775

Daniele Belardinelli, Simone Benella, Mirko Stumpo, Giuseppe Consolini

{"title":"Derivation of generalized Kappa distribution from scaling properties of solar wind magnetic field fluctuations at kinetic scales","authors":"Daniele Belardinelli, Simone Benella, Mirko Stumpo, Giuseppe Consolini","doi":"arxiv-2409.01775","DOIUrl":"https://doi.org/arxiv-2409.01775","url":null,"abstract":"Kinetic scale dynamics in weakly-collisional space plasmas usually exhibits a\u0000self-similar statistics of magnetic field fluctuations which implies the\u0000existence of an invariant probability density function (master curve). We\u0000provide an analytical derivation of the master curve by assuming that\u0000perpendicular fluctuations can be modeled through a scale-dependent Langevin\u0000equation. In our model, magnetic field fluctuations are the stochastic variable\u0000and their scale-to-scale evolution is assumed to be a Langevin process. We\u0000propose a formal derivation of the master curve describing the statistics of\u0000the fluctuations at kinetic scales. Model predictions are tested on independent\u0000data samples of fast solar wind measured near the Sun by Parker Solar Probe and\u0000near the Earth by Cluster. The master curve is a generalization of the Kappa\u0000distribution with two parameters: one regulating the tails and the other one\u0000controlling the asymmetry. Model predictions match the spacecraft observations\u0000up to 5$sigma$ and even beyond in the case of perpendicular magnetic field\u0000fluctuations.","PeriodicalId":501423,"journal":{"name":"arXiv - PHYS - Space Physics","volume":"2016 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

$1/f$ Noise in the Heliosphere: A Target for PUNCH Science 日光层中的 1/f$ 噪音：PUNCH 科学的目标

arXiv - PHYS - Space Physics Pub Date : 2024-09-03 DOI: arxiv-2409.02255

Jiaming Wang, William H. Matthaeus, Rohit Chhiber, Sohom Roy, Rayta A. Pradata, Francesco Pecora, Yan Yang

{"title":"$1/f$ Noise in the Heliosphere: A Target for PUNCH Science","authors":"Jiaming Wang, William H. Matthaeus, Rohit Chhiber, Sohom Roy, Rayta A. Pradata, Francesco Pecora, Yan Yang","doi":"arxiv-2409.02255","DOIUrl":"https://doi.org/arxiv-2409.02255","url":null,"abstract":"We present a broad review of 1/f noise observations in the heliosphere, and\u0000discuss and complement the theoretical background of generic 1/f models as\u0000relevant to NASA's Polarimeter to Unify the Corona and Heliosphere (PUNCH)\u0000mission. First observed in the voltage fluctuations of vacuum tubes, the\u0000scale-invariant 1/f spectrum has since been identified across a wide array of\u0000natural and artificial systems, including heart rate fluctuations and loudness\u0000patterns in musical compositions. In the solar wind, the interplanetary\u0000magnetic field trace spectrum exhibits 1/f scaling within the frequency range\u0000from around 2e-6 Hz to 1e-4 Hz at 1 au. One compelling mechanism for the\u0000generation of 1/f noise is the superposition principle, where a composite 1/f\u0000spectrum arises from the superposition of a collection of individual power-law\u0000spectra characterized by a scale-invariant distribution of correlation times.\u0000In the context of the solar wind, such a superposition could originate from\u0000scale-invariant reconnection processes in the corona. Further observations have\u0000detected 1/f signatures in the photosphere and corona at frequency ranges\u0000compatible with those observed at 1 au, suggesting an even lower altitude\u0000origin of 1/f spectrum in the solar dynamo itself. This hypothesis is bolstered\u0000by dynamo experiments and simulations that indicate inverse cascade activities,\u0000which can be linked to successive flux tube reconnections beneath the corona,\u0000and are known to generate 1/f noise possibly through nonlocal interactions at\u0000the largest scales. Conversely, models positing in situ generation of 1/f\u0000signals face causality issues in explaining the low-frequency portion of the\u00001/f spectrum. Understanding 1/f noise in the solar wind may inform central\u0000problems in heliospheric physics, such as the solar dynamo, coronal heating,\u0000the origin of the solar wind, and the nature of interplanetary turbulence.","PeriodicalId":501423,"journal":{"name":"arXiv - PHYS - Space Physics","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Decoding the formation of hammerhead ion populations observed by Parker Solar Probe 帕克太阳探测器观测到的锤头离子群的形成解码

arXiv - PHYS - Space Physics Pub Date : 2024-09-03 DOI: arxiv-2409.01997

Shaaban M. Shaaban, M. Lazar, R. A. López, P. H. Yoon, S. Poedts

引用次数: 0

Italian Spring Accelerometer measurements of unexpected Non Gravitational Perturbation during BepiColombo second Venus swing-by 意大利弹簧加速度计对贝皮-科伦坡号第二次金星掠过期间意外非重力扰动的测量结果

arXiv - PHYS - Space Physics Pub Date : 2024-09-03 DOI: arxiv-2409.02015

Carmelo Magnafico, Umberto De Filippis, Francesco Santoli, Carlo Lefevre, Marco Lucente, David Lucchesi, Emiliano Fiorenza, Roberto Peron, Valerio Iafolla

{"title":"Italian Spring Accelerometer measurements of unexpected Non Gravitational Perturbation during BepiColombo second Venus swing-by","authors":"Carmelo Magnafico, Umberto De Filippis, Francesco Santoli, Carlo Lefevre, Marco Lucente, David Lucchesi, Emiliano Fiorenza, Roberto Peron, Valerio Iafolla","doi":"arxiv-2409.02015","DOIUrl":"https://doi.org/arxiv-2409.02015","url":null,"abstract":"The Italian Spring Accelerometer (ISA) is a three axis mass-spring\u0000accelerometer, one of the payloads of the BepiColombo joint space mission\u0000between the European Space Agency (ESA) and the Japan Aerospace Exploration\u0000Agency (JAXA). At launch in October 2018, BepiColombo started its seven-year\u0000cruise as a stack of three different modules, overall named Mercury Composite\u0000Spacecraft (MCS). The spacecraft will provide BepiColombo the necessary Delta V\u0000to reach Mercury with its electric thrusters and along with one, two and six\u0000gravity assists, respectively with Earth, Venus and Mercury. The accelerometer\u0000is accommodated on the Mercury Planetary Orbiter (MPO) module and, jointly with\u0000the Ka-band Transponder (KaT) tracking data, will primarily serve the\u0000BepiColombo Radio Science Experiment (BC-RSE). During the second Venus\u0000swing-by, strong tidal effect and external perturbations was expected to act on\u0000the spacecraft and to become detectable by ISA. The swing-by had a closest\u0000approach of about 550 km and the gravity gradient expected on the IDA sensing\u0000elements was perfectly measured. Hence, in this paper, the first direct Gravity\u0000Gradient effect detection generated by an extraterrestrial body is shown.\u0000Nevertheless, around the closest approach, the measurements evidenced a\u0000spurious acceleration event lasting for several minutes. This work, exploiting\u0000information on the Attitude and Orbit Control System (AOCS) commanded torques,\u0000focuses and analyses this ISA acceleration signal, ascribing it to a net force\u0000really acting on the MCS spacecraft. Furthermore, using an estimation method,\u0000the application point of the force is confined to an area close to the MPO\u0000radiator.","PeriodicalId":501423,"journal":{"name":"arXiv - PHYS - Space Physics","volume":"109 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

INTENTAS -- An entanglement-enhanced atomic sensor for microgravity INTENTAS -- 用于微重力环境的纠缠增强型原子传感器

arXiv - PHYS - Space Physics Pub Date : 2024-09-02 DOI: arxiv-2409.01051

O. Anton, I. Bröckel, D. Derr, A. Fieguth, M. Franzke, M. Gärtner, E. Giese, J. S. Haase, J. Hamann, A. Heidt, S. Kanthak, C. Klempt, J. Kruse, M. Krutzik, S. Kubitza, C. Lotz, K. Müller, J. Pahl, E. M. Rasel, M. Schiemangk, W. P. Schleich, S. Schwertfeger, A. Wicht, L. Wörner

{"title":"INTENTAS -- An entanglement-enhanced atomic sensor for microgravity","authors":"O. Anton, I. Bröckel, D. Derr, A. Fieguth, M. Franzke, M. Gärtner, E. Giese, J. S. Haase, J. Hamann, A. Heidt, S. Kanthak, C. Klempt, J. Kruse, M. Krutzik, S. Kubitza, C. Lotz, K. Müller, J. Pahl, E. M. Rasel, M. Schiemangk, W. P. Schleich, S. Schwertfeger, A. Wicht, L. Wörner","doi":"arxiv-2409.01051","DOIUrl":"https://doi.org/arxiv-2409.01051","url":null,"abstract":"The INTENTAS project aims to develop an atomic sensor utilizing entangled\u0000Bose-Einstein condensates (BECs) in a microgravity environment. This key\u0000achievement is necessary to advance the capability for measurements that\u0000benefit from both entanglement-enhanced sensitivities and extended\u0000interrogation times. The project addresses significant challenges related to\u0000size, weight, and power management (SWaP) specific to the experimental platform\u0000at the Einstein-Elevator in Hannover. The design ensures a low-noise\u0000environment essential for the creation and detection of entanglement.\u0000Additionally, the apparatus features an innovative approach to the all-optical\u0000creation of BECs, providing a flexible system for various configurations and\u0000meeting the requirements for rapid turnaround times. Successful demonstration\u0000of this technology in the Einstein-Elevator will pave the way for a future\u0000deployment in space, where its potential applications will unlock\u0000high-precision quantum sensing.","PeriodicalId":501423,"journal":{"name":"arXiv - PHYS - Space Physics","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Deciphering Interstellar Ice Morphology: Atomistic Simulations Reveal the Complex Behavior of Ethanethiol 解密星际冰形态：原子模拟揭示乙硫醇的复杂行为

arXiv - PHYS - Space Physics Pub Date : 2024-09-02 DOI: arxiv-2409.00975

Jeet Majumdar, Shubhadeep Nag, Tejender S Thakur, Subramanian Yashonath, Bhalamurugan Sivaraman, Prabal K. Maiti

引用次数: 0

Review of the August 1972 and March 1989 Space Weather Events: Can We Learn Anything New From Them? 回顾 1972 年 8 月和 1989 年 3 月的空间天气事件：我们能从中学到新东西吗？

arXiv - PHYS - Space Physics Pub Date : 2024-08-31 DOI: arxiv-2409.00452

Bruce T. Tsurutani, Abhijit Sen, Rajkumar Hajra, Gurbax S. Lakhina, Richard B. Horne, Tohru Hada

{"title":"Review of the August 1972 and March 1989 Space Weather Events: Can We Learn Anything New From Them?","authors":"Bruce T. Tsurutani, Abhijit Sen, Rajkumar Hajra, Gurbax S. Lakhina, Richard B. Horne, Tohru Hada","doi":"arxiv-2409.00452","DOIUrl":"https://doi.org/arxiv-2409.00452","url":null,"abstract":"Updated summaries of the August 1972 and March 1989 space weather events have\u0000been constructed. The features of these two events are compared to the\u0000Carrington 1859 event and a few other major space weather events. It is\u0000concluded that solar active regions release energy in a variety of forms\u0000(X-rays, EUV photons, visible light, coronal mass ejection (CME) plasmas and\u0000fields) and they in turn can produce other energetic effects (solar energetic\u0000particles (SEPs), magnetic storms) in a variety of ways. It is clear that there\u0000is no strong one-to-one relationship between these various energy sinks. The\u0000energy is often distributed differently from one space weather event to the\u0000next. Concerning SEPs accelerated at interplanetary CME (ICME) shocks, it is\u0000concluded that the Fermi mechanism associated with quasi-parallel shocks is\u0000relatively weak and that the gradient drift mechanism (electric fields) at\u0000quasi-perpendicular shocks will produce harder spectra and higher fluxes. If\u0000the 4 Augusut 1972 intrinsic magnetic cloud condition (southward interplanetary\u0000magnetic field instead of northward) and the interplanetary Sun to 1 au\u0000conditions were different, a 4 August 1972 magnetic storm and magnetospheric\u0000dawn-to-dusk electric fields substantially larger than the Carrington event\u0000would have occurred. Under these special interplanetary conditions, a Miyake et\u0000al. (2012)-like extreme SEP event may have been formed. The long duration\u0000complex 1989 storm was probably greater than the Carrington storm in the sense\u0000that the total ring current particle energy was larger.","PeriodicalId":501423,"journal":{"name":"arXiv - PHYS - Space Physics","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0