PMO OpenIR  > 太阳活动的多波段观测研究团组
Location and parameters of a microwave millisecond spike event
Huang, GL; Nakajima, H
2005
Source PublicationASTROPHYSICS AND SPACE SCIENCE
ISSN0004-640X
Volume295Issue:4Pages:423-442
AbstractA typical microwave millisecond spike event on November 2, 1997 was observed by the radio spectrograph of National Astronomical Observatories (NAOs) at 2.6-3.8 GHz with high time and frequency resolution. This event was also recorded by Nobeyama Radio Polarimeters (NoRP) at 1-35 GHz and Radio Heliograph (NoRH) at 17 GHz. The source at 17 GHz is located in one foot-point of a small bright coronal loop of YOHKOH SXT and SOHO EIT images with strong photospheric magnetic field in SOHO MDI magnetograph. It is assumed that the electron cyclotron maser instability and gyro-resonance absorption dominate, respectively, the rising and decay phase of the spike event. For different harmonic number of gyro-frequency or magnetic field strength, a fitting program with free plasma parameters is used to minimize the difference between the observational and theoretical values of the exponential growth and decay rates for a given spike. The plasma parameters at third harmonic number are more comparable to their typical values in solar corona. Hence, it is able to provide a diagnosis for the source parameters (magnetic field, density, and temperature), the properties of radiations (wave vector and propagation angle), and the properties of non-thermal electrons (density, pitch angle, and energy). The results are also comparable with the diagnosis of the gyro-synchrotron radiation model, the frequency drift rates and a dipole magnetic field model, as well as the YOHKOH SXT and SOHO MDI data.
KeywordSolar Solar Bursts Coronal Loops Plasma Instabilities (Ltex)-t-a
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordELECTRON-CYCLOTRON MASER ; NONTHERMAL ELECTRONS ; RADIO SPIKES ; MAGNETIC-FIELD ; SOLAR CORONA ; LOSS CONE ; EMISSION ; INSTABILITY ; RADIATION ; BURSTS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000227701700001
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/4148
Collection太阳活动的多波段观测研究团组
Affiliation1.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Natl Astron Observ, Beijing, Peoples R China
3.Nobeyama Radio Observ, Minamisa Ku, Nagano 3841305, Japan
Recommended Citation
GB/T 7714
Huang, GL,Nakajima, H. Location and parameters of a microwave millisecond spike event[J]. ASTROPHYSICS AND SPACE SCIENCE,2005,295(4):423-442.
APA Huang, GL,&Nakajima, H.(2005).Location and parameters of a microwave millisecond spike event.ASTROPHYSICS AND SPACE SCIENCE,295(4),423-442.
MLA Huang, GL,et al."Location and parameters of a microwave millisecond spike event".ASTROPHYSICS AND SPACE SCIENCE 295.4(2005):423-442.
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