สืบค้นงานวิจัย
Latitude survey investigation of galactic cosmic ray solar modulation during 1994-2007
Nuntiyakul W. - ไม่ระบุหน่วยงาน
ชื่อเรื่อง (EN): Latitude survey investigation of galactic cosmic ray solar modulation during 1994-2007
ผู้แต่ง / หัวหน้าโครงการ (EN): Nuntiyakul W.
บทคัดย่อ (EN): The Galactic cosmic ray spectrum exhibits subtle variations over the 22 yr solar magnetic cycle in addition to the more dramatic variations over the 11 yr sunspot cycle. Neutron monitors are large ground-based detectors that provide accurate measurements of variations in the cosmic ray flux at the top of the atmosphere above the detector. At any given location the magnetic field of the Earth excludes particles below a well-defined rigidity (momentum per unit charge) known as the cutoff rigidity, which can be accurately calculated using detailed models of the geomagnetic field. By carrying a neutron monitor to different locations, e.g., on a ship, the Earth itself serves as a magnet spectrometer. By repeating such latitude surveys with identical equipment, a sensitive measurement of changes in the spectrum can be made. In this work, we analyze data from the 1994 through 2007 series of latitude surveys conducted by the Bartol Research Institute, the University of Tasmania, and the Australian Antarctic Division. We confirm the curious "crossover" in spectra measured near solar minima during epochs of opposite solar magnetic polarity, and show that it is directly related to a sudden change in the spectral behavior of solar modulation at the time of the polarity reversal, as revealed from contemporaneous variations in the survey data and a fixed station. We suggest that the spectral change and crossover result from the interaction of effects due to gradient/curvature drifts with a systematic change in the interplanetary diffusion coefficient caused by turbulent magnetic helicity. © 2014. The American Astronomical Society. All rights reserved..
บทคัดย่อ: ไม่พบข้อมูลจากหน่วยงานต้นทาง
ภาษา (EN): en
เอกสารแนบ (EN): https://www.scopus.com/inward/record.uri?eid=2-s2.0-84908044991&doi=10.1088%2f0004-637X%2f795%2f1%2f11&partnerID=40&md5=157d2df6c1b58a2732ad0c88c62cd4ea
เผยแพร่โดย (EN): มหาวิทยาลัยมหิดล
คำสำคัญ (EN): terrestrial relations
เจ้าของลิขสิทธิ์ (EN): มหาวิทยาลัยมหิดล
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Nuntiyakul W.. "Latitude survey investigation of galactic cosmic ray solar modulation during 1994-2007". ไม่ระบุหน่วยงาน. ม.ป.ป.

Nuntiyakul W.. "Latitude survey investigation of galactic cosmic ray solar modulation during 1994-2007". ไม่ระบุหน่วยงาน. ม.ป.ป.. Print.



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Latitude survey investigation of galactic cosmic ray solar modulation during 1994-2007
Nuntiyakul W.
มหาวิทยาลัยมหิดล
ไม่ระบุวันที่เผยแพร่
Development and evaluation of solar powered catamaran for sustainable tourism in southeast of the gulf of Thailand MONITORING SHORT-TERM COSMIC-RAY SPECTRAL VARIATIONS USING NEUTRON MONITOR TIME-DELAY MEASUREMENTS Modeling polar region atmospheric ionization induced by the giant solar storm on 20 January 2005 Distinct Pattern of Solar Modulation of Galactic Cosmic Rays above a High Geomagnetic Cutoff Rigidity Galactic Cosmic-Ray Anistropy during the Forbush Decrease Starting 2013 April 13 Dependence of the neutron monitor count rate and time delay distribution on the rigidity spectrum of primary cosmic rays Cosmic-Ray Diffusion Coefficients throughout the Inner Heliosphere from a Global Solar Wind Simulation Galactic Cosmic-Ray Anisotropy in the Northern Hemisphere from the ARGO-YBJ Experiment during 2008-2012 Corotating solar wind structures and recurrent trains of enhanced diurnal variation in galactic cosmic rays Bare Neutron Counter and Neutron Monitor Response to Cosmic Rays During a 1995 Latitude Survey
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