Journal of Atmospheric and Terrestrial Physics最新文献_第9页

Time evolution of the optical effects and aerosol characteristics of Mt. Pinatubo origin from ground-based observations 来自地面观测的皮纳图博山光学效应和气溶胶特征的时间演变

Journal of Atmospheric and Terrestrial Physics Pub Date : 1996-07-01 DOI: 10.1016/0021-9169(95)00079-8

K. Krishna Moorthy, Prabha R. Nair, B.V. Krishna Murthy, S.K. Satheesh

{"title":"Time evolution of the optical effects and aerosol characteristics of Mt. Pinatubo origin from ground-based observations","authors":"K. Krishna Moorthy, Prabha R. Nair, B.V. Krishna Murthy, S.K. Satheesh","doi":"10.1016/0021-9169(95)00079-8","DOIUrl":"10.1016/0021-9169(95)00079-8","url":null,"abstract":"<div>The time evolution of the perturbations in aerosol spectral optical depths associated with the Mt. Pinatubo volcanic eruption of June 1991 is investigated using a ground-based multiwavelength solar radiometer at the tropical station, Trivandrum. The spectral optical depths of the volcanic aerosols deduced from the radiometer data are inverted to retrieve the size distributions of the particles, from which the effective radius and columnar mass loading are estimated. Observations showed that during the initial phase (within one year after the eruption) the optical depths showed fluctuations with two peaks, one in November 1991 and another in February 1992 superposed over a very weak decreasing trend. During this period, the size distributions have been generally bimodal, with a secondary large particle mode occurring at ∼0.75 μm, and the columnar mass loading varied between about 170 and 110 mg m−2. The optical depths and mass loading decreased with an e-folding time of about 15 months. The effective radius is found to increase from ∼0.35 μm in September 1991 to ∼0.60 μm in October 1992 and then remain rather steady, while the mass loading decreased to reach near-background levels (within error limits) by early 1993.</div>","PeriodicalId":100754,"journal":{"name":"Journal of Atmospheric and Terrestrial Physics","volume":"58 10","pages":"Pages 1101-1116"},"PeriodicalIF":0.0,"publicationDate":"1996-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0021-9169(95)00079-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53071221","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: 23

Global change and relevant space observations 全球变化及相关空间观测

Journal of Atmospheric and Terrestrial Physics Pub Date : 1996-07-01 DOI: 10.1016/S0021-9169(96)90060-4

J. London

引用次数: 0

Solar-terrestrial variability and global change 日地变率和全球变化

Journal of Atmospheric and Terrestrial Physics Pub Date : 1996-07-01 DOI: 10.1016/S0021-9169(96)90061-6

W.J. Burroughs

引用次数: 6

Physics of the inner heliosphere, vol. II—particles, waves and turbulence 内日球层物理学，第二卷——粒子、波和湍流

Journal of Atmospheric and Terrestrial Physics Pub Date : 1996-07-01 DOI: 10.1016/S0021-9169(96)90066-5

A. Hewish

引用次数: 6

Fluid mechanics of the atmosphere 大气的流体力学

Journal of Atmospheric and Terrestrial Physics Pub Date : 1996-07-01 DOI: 10.1016/S0021-9169(96)90062-8

I.N. James

引用次数: 0

Statistical plasma physics, volume I: Basic principles 统计等离子体物理学，第一卷:基本原理

Journal of Atmospheric and Terrestrial Physics Pub Date : 1996-07-01 DOI: 10.1016/S0021-9169(96)90064-1

J.A. Bittencourt

引用次数: 16

Penetration of hydromagnetic waves of cylindrical symmetry through the high latitude ionosphere 圆柱对称的水磁波穿透高纬度电离层

Journal of Atmospheric and Terrestrial Physics Pub Date : 1996-07-01 DOI: 10.1016/0021-9169(95)00102-6

D.Y. Zhang, K.D. Cole

引用次数: 1

Climate Change 1992: The supplementary report to the IPCC scientific assessment 气候变化1992:IPCC科学评估的补充报告

Journal of Atmospheric and Terrestrial Physics Pub Date : 1996-07-01 DOI: 10.1016/S0021-9169(96)90059-8

S.E. Hobbs

引用次数: 295

The solar-terrestrial environment 日地环境

Journal of Atmospheric and Terrestrial Physics Pub Date : 1996-07-01 DOI: 10.1016/S0021-9169(96)90063-X

A. Farmer

引用次数: 219

Investigation of Langmuir turbulence excited by a relativistic electron beam in a magnetic field 磁场中相对论电子束激发朗缪尔湍流的研究

Journal of Atmospheric and Terrestrial Physics Pub Date : 1996-06-01 DOI: 10.1016/0021-9169(95)00132-8

L.N. Vyacheslavov, V.S. Burmasov, I.V. Kandaurov, Eh.P. Kruglyakov, O.I. Meshkov, A.L. Sanin

{"title":"Investigation of Langmuir turbulence excited by a relativistic electron beam in a magnetic field","authors":"L.N. Vyacheslavov, V.S. Burmasov, I.V. Kandaurov, Eh.P. Kruglyakov, O.I. Meshkov, A.L. Sanin","doi":"10.1016/0021-9169(95)00132-8","DOIUrl":"10.1016/0021-9169(95)00132-8","url":null,"abstract":"<div>The Thomson scattering technique has been employed for the observation of turbulent waves excited by a relativistic electron beam. The frequency and k-spectra of the Langmuir waves are measured both in the excited and damped regions. The waves interact directly with the beam electrons inside a narrow section of k-sppace amid the region occupied by the non-resonant waves, which concentrate near k ∼ ωpe/c. Both resonant and non-resonant waves hold equal (to within an order of magnitude) amounts of energy. Incoherent scattering of the second harmonic of a Nd : glass laser is used to measure the time history of the electron distribution function including the super thermal tails. The typical beam and plasma parameters are as follows: (ne ∼ 1015 cm−3, nb/ne ∼ 10−4, B = 1–4 T, tb = 100–200 ns). The peculiarity of these experiments is the presence of a strong magnetic field (ωBec/ωpe VTe ⪢ 1, but cope ⪢ ωBe) which, together with plasma non-isothermality (Te ⪢ Ti), sets conditions typical for laboratory and space plasmas. At present, the processes under these conditions have not been adequately investigated, either experimentally or theoretically, especially for our case of developed Langmuir turbulence, when the spatial and temporal scales far exceed those for a single caviton. This work is centred on the study of developed Langmuir turbulence in a magnetized plasma.</div>","PeriodicalId":100754,"journal":{"name":"Journal of Atmospheric and Terrestrial Physics","volume":"58 8","pages":"Pages 1005-1012"},"PeriodicalIF":0.0,"publicationDate":"1996-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0021-9169(95)00132-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53071731","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: 2