สืบค้นงานวิจัย
Corotating solar wind structures and recurrent trains of enhanced diurnal variation in galactic cosmic rays
Yeeram T. - ไม่ระบุหน่วยงาน
ชื่อเรื่อง (EN): Corotating solar wind structures and recurrent trains of enhanced diurnal variation in galactic cosmic rays
ผู้แต่ง / หัวหน้าโครงการ (EN): Yeeram T.
บทคัดย่อ (EN): Data from the Princess Sirindhorn Neutron Monitor at Doi Inthanon, Thailand, with a vertical cutoff rigidity of 16.8 GV, were utilized to determine the diurnal anisotropy (DA) of Galactic cosmic rays (GCRs) near Earth during solar minimum conditions between 2007 November and 2010 November. We identified trains of enhanced DA over several days, which often recur after a solar rotation period (27 days). By investigating solar coronal holes as identified from synoptic maps and solar wind parameters, we found that the intensity and anisotropy of cosmic rays are associated with the high-speed streams (HSSs) in the solar wind, which are in turn related to the structure and evolution of coronal holes. An enhanced DA was observed after the onset of some, but not all, HSSs. During time periods of recurrent trains, the DA was often enhanced or suppressed according to the sign of the interplanetary magnetic field B, which suggests a contribution from a mechanism involving a southward gradient in the GCR density, n, and a gradient anisotropy along B × ∇n. In one non-recurrent and one recurrent sequence, an HSS from an equatorial coronal hole was merged with that from a trailing mid-latitude extension of a polar coronal hole, and the slanted HSS structure in space with suppressed GCR density can account for the southward GCR gradient. We conclude that the gradient anisotropy is a source of temporary changes in the GCR DA under solar minimum conditions, and that the latitudinal GCR gradient can sometimes be explained by the coronal hole morphology. © 2014. The American Astronomical Society. All rights reserved..
บทคัดย่อ: ไม่พบข้อมูลจากหน่วยงานต้นทาง
ภาษา (EN): en
เอกสารแนบ (EN): https://www.scopus.com/inward/record.uri?eid=2-s2.0-84896525079&doi=10.1088%2f0004-637X%2f784%2f2%2f136&partnerID=40&md5=4998981341a62b216e3933c693e6333f
เผยแพร่โดย (EN): มหาวิทยาลัยมหิดล
คำสำคัญ (EN): solar wind
เจ้าของลิขสิทธิ์ (EN): มหาวิทยาลัยมหิดล
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Yeeram T.. "Corotating solar wind structures and recurrent trains of enhanced diurnal variation in galactic cosmic rays". ไม่ระบุหน่วยงาน. ม.ป.ป.

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Corotating solar wind structures and recurrent trains of enhanced diurnal variation in galactic cosmic rays
Yeeram T.
มหาวิทยาลัยมหิดล
ไม่ระบุวันที่เผยแพร่
Dependence of the neutron monitor count rate and time delay distribution on the rigidity spectrum of primary cosmic rays Distinct Pattern of Solar Modulation of Galactic Cosmic Rays above a High Geomagnetic Cutoff Rigidity EFFECT of COHERENT STRUCTURES on ENERGETIC PARTICLE INTENSITY in the SOLAR WIND at 1 AU Latitude survey investigation of galactic cosmic ray solar modulation during 1994-2007 Cosmic-Ray Diffusion Coefficients throughout the Inner Heliosphere from a Global Solar Wind Simulation Effect of gamma rays on morphological character variation of Nelumbo nucifera ‘Pathum’ Galactic Cosmic-Ray Anistropy during the Forbush Decrease Starting 2013 April 13 Galactic Cosmic-Ray Anisotropy in the Northern Hemisphere from the ARGO-YBJ Experiment during 2008-2012 Development of a Natural Rubber Dryer Based on Multi Energy Resources (Biomass, Solar and Wind) Bare Neutron Counter and Neutron Monitor Response to Cosmic Rays During a 1995 Latitude Survey
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