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Showing papers in "Journal of Atmospheric and Solar-Terrestrial Physics in 2012"


Journal ArticleDOI
TL;DR: In this article, the authors identified future research areas in relation to Task Group 4 of the Climate and Weather of the Sun-Earth System (CAWSES-II) programme, in terms of radiative effects in the troposphere, through infra-red absorption, and cloud effects, in particular possible cloud microphysical effects from charging at layer cloud edges.

141 citations


Journal ArticleDOI
TL;DR: This article analyzed global magnetohydrodynamic (MHD) solutions of the inner heliosphere for several intervals defined as part of a Center for Integrated Space weather weather modeling (CISM) interdisciplinary campaign study, and compared in situ measurements from ACE and STEREO A and B with the model results to illustrate both the capabilities and limitations of current numerical techniques.

128 citations


Journal ArticleDOI
TL;DR: In this paper, a comprehensive analysis and discussion of the processes of ESF development, suppression or disruption under different phases of a storm activity sequence is presented, and the consequences for ESF occurrence from undershielding and over-shielding penetration electric fields as well as from the disturbance winds and wind dynamo electric field occurring in different local time sectors of the night, as also the irregularity dynamics and longitude extension.

121 citations


Journal ArticleDOI
TL;DR: In this article, the roles of planetary waves and gravity waves were examined during a realistic major stratospheric sudden warming (SSW), simulated in the National Center for Atmospheric Research Whole Atmosphere Community Climate Model (WACCM).

108 citations


Journal ArticleDOI
Nicola Scafetta1
TL;DR: The Schwabe frequency band of the Zurich sunspot record since 1749 is found to be made of three major cycles with periods of about 9.98, 10.9 and 11.86 years as mentioned in this paper.

106 citations


Journal ArticleDOI
TL;DR: GUMICS-4 as mentioned in this paper is a global magnetosphere-ionosphere coupling simulation based on global MHD magnetosphere and an electrostatic ionosphere, which can reveal the detailed spatiotemporal behaviour of the magnetosphere−ionosphere system under given solar wind forcing.

106 citations


Journal ArticleDOI
TL;DR: LuLuhr and Xiong as discussed by the authors investigated the causes for these discrepancies with the help of ionosonde and PLP data from the Communications/Navigation Outage Forecasting System (C/NOFS) satellite.

101 citations


Journal ArticleDOI
Nicola Scafetta1
TL;DR: In this article, a first order magnification factor was calculated using an adaptation of the well-known mass-luminosity relation for main-sequence stars similar to the Sun, which yields a conversion factor between the solar luminosity and the potential gravitational power associated to the mass lost by nuclear fusion.

94 citations


Journal ArticleDOI
TL;DR: In this article, the variations in black carbon (BC) aerosol mass concentration over Patiala city, Punjab, India, during October/November-2008 associated with agriculture crop residue burning activities were analyzed.

86 citations


Journal ArticleDOI
TL;DR: In this article, the performance of the TRMM precipitation estimation using ground-based radars from the Global Precipitation Measurement (GPM) validation network was evaluated in view of different surface and rain type flags.

79 citations


Journal ArticleDOI
TL;DR: In this article, the first observational evidence that ice particles comprising polar mesospheric clouds (PMC) contain small amounts of meteoric smoke (0.01-3% by volume), using measurements from the Solar Occultation For Ice Experiment (SOFIE).

Journal ArticleDOI
Nicola Scafetta1
TL;DR: In this article, the authors compare the performance of a recently proposed empirical climate model based on astronomical harmonics against all CMIP3 available general circulation climate models (GCM) used by the IPCC (2007) to interpret the 20th century global surface temperature.

Journal ArticleDOI
Nicola Scafetta1
TL;DR: In this paper, the authors show that the historical records of mid-latitude auroras from 1700 to 1966 present oscillations with periods of about 9, 10-11, 20-21, 30 and 60 years.

Journal ArticleDOI
TL;DR: In this paper, the spectral dependence of short-term solar ultraviolet irradiance data from the Solar Radiation and Climate Experiment (SORCE) Spectral Irradiance Monitor (SIM) and Solar Stellar Irradiances Comparison Experiment (sOLSTICE) instruments covering the declining phase of Cycle 23 was analyzed.

Journal ArticleDOI
TL;DR: In this paper, the authors examined a dataset consisting of 71 bolides detected by satellite sensors, which provided energy and location estimates, with simultaneous measurements of the same events on 143 distinct waveforms.

Journal ArticleDOI
TL;DR: In this article, the authors explore both the background upper atmosphere and the characteristics of these CIR/HSS events in 2008 using both models and data, showing mid-latitude positive storm effects on NmF2 on the day of the storm and long, extended periods of storm induced changes on the following days.

Journal ArticleDOI
TL;DR: In this article, a case study of the winter season 2009/2010 for two mid-latitude stations at the edge of the polar vortex and one station within the island of Andoya is presented, where meteor radar observations of upper mesospheric/lower thermospheric winds and temperatures are suitable to investigate planetary waves in the mesosphere.

Journal ArticleDOI
TL;DR: In this article, the effects of a broad spectrum of small-scale internal gravity wave (GW) of lower atmospheric origin on the equinoctial thermosphere are studied for the first time.

Journal ArticleDOI
TL;DR: The Collm (51.3°N, 13.0°E) radar has been operated continuously since summer 2004 and the 6-year mean of horizontal prevailing winds and tides at 80-100 km height are shown in this article.

Journal ArticleDOI
TL;DR: In this article, the relationship between the high latitude northern hemispheric major sudden stratospheric warming (SSW) events of 2006 and 2009 and low-latitude mesospheric tidal variability in zonal winds observed by the MF radar at Tirunelveli (8.7°0N, 77.8°E) exists.

Journal ArticleDOI
TL;DR: In this paper, the authors examined the electric field changes generated by the preliminary breakdown for negative cloud-to-ground lightning flashes in Malaysia and Sweden concerning the association of slow field changes associated in preliminary breakdown process.

Journal ArticleDOI
TL;DR: In this article, the authors present a result of model calculation of the disturbance dynamo electric field, prompt penetration, overshielding and their ionospheric effects during geomagnetic storm on December 14-15, 2006.

Journal ArticleDOI
TL;DR: In this article, a full decomposition of tidal signatures in three important ionospheric quantities, the equatorial electrojet (EEJ), vertical plasma drift and the crest-to-trough ratio (CTR), was presented for the first time.

Journal ArticleDOI
TL;DR: In this article, the relationship between the length of a sunspot cycle and the average temperature in the same and the next cycle is calculated for a number of meteorological stations in Norway and in the North Atlantic region.

Journal ArticleDOI
TL;DR: Aerosol characteristics were studied over Delhi, a typical urban station in the Ganga basin in Northern India, during two contrasting weather conditions: winter and summer, to explain the changes in columnar and surface aerosol characteristics with the help of ground-based measurements and CALIPSO satellite data.

Journal ArticleDOI
TL;DR: In this article, the authors analyzed the equatorial upper mesosphere and lower mesosphere during three austral summers and found that upper mesospheric dynamics at 7°S has been affected when a remarkable major Sudden Stratospheric Warming (SSW) event took place in January 2006.

Journal ArticleDOI
TL;DR: In this article, the authors present a physical analysis of the occasionally forwarded hypothesis that solar variability, as shown in the various photospheric and outer solar layer activities, might be due to the Newtonian attraction by the planets.

Journal ArticleDOI
TL;DR: In this article, the impact of urbanization on the long-term trends in the lidar measurements of aerosol loadings over the experimental site is brought out, which was achieved by using the data set built for inferring the urban aspects of the city of Pune, which included population, number of industries and vehicles etc.

Journal ArticleDOI
TL;DR: In this article, the authors numerically investigated the couplings between the non-migrating atmospheric tide in the mesosphere and low thermosphere (MLT) and the response wave in the upper and ionosphere and found that both the upward wave propagation and the electro-dynamical coupling can produce the thermospheric and ionospheric WN4 structure.

Journal ArticleDOI
TL;DR: In this paper, the mean diurnal, monthly, seasonal, and annual variation in the ionospheric TEC during the lowest solar activity phase for the periods of 2009-2010 was studied.