Showing papers in "Journal of Atmospheric and Solar-Terrestrial Physics in 2011"

TL;DR: In this article, the global spatial and altitude structure of the mean ionospheric response to sudden stratospheric warming (SSW) events in winters of 2007/2008 and 2008/2009 was analyzed.

TL;DR: In this paper, the authors reviewed the geomagnetic effects of Directional Discontuities (DDs) and their effects on magnetospheric/space weather research and showed that they are particularly useful as diagnostics since they are clearly identifiable in interplanetary data.

TL;DR: A review of the most recent efforts to model solar total and spectral irradiance on time scales from days to centuries and even longer can be found in this paper, where the authors suggest a value of about 1 − 1.5 W / m 2 for the increase in the cycle-averaged TSI since the end of the Maunder minimum.

TL;DR: In this article, the authors provide a short review of some of the basic concepts related to the observations of coronal mass ejections (CMEs) in white light images and at large distances from the Sun.

TL;DR: In this article, an overview of the observed properties of large-scale wave-like fronts in the solar atmosphere (Moreton waves, EIT waves and similar phenomena observed in other wavelengths) is presented.

TL;DR: In this paper, the authors review the multi-spacecraft ICME observations conducted before the STEREO era and discuss the ICME properties that were identified at least by one of the spacecraft and those at the Lagrangian point L1 (Wind/ACE) from April 2007 through March 2008.

TL;DR: In this paper, the mutual relation of sunspot numbers and several proxies of solar UV/EUV radiation, such as the F10.7 radio flux, the HeI 1083 nm equivalent width and the solar MgII core-to-wing ratio, was studied.

TL;DR: In this article, the precipitation loss of ring current protons produced by the electromagnetic ion cyclotron (EMIC) waves at the location L=3.5 where the symmetrical ring current primarily occurs was examined.

TL;DR: In this article, the authors investigated the global distribution of water vapor using COSMIC GPS RO measurements and made detailed comparisons with GPS radiosonde measurements across 13 tropical stations and model outputs (ERA-Interim, NCEP, and JRA-25 reanalyses data sets).

TL;DR: In this article, the authors analyzed the large-scale dynamical forms of three erupting prominences (filaments) observed by at least one of the two STEREO spacecraft and which reveal evidence of sideways rolling motion beginning at the crest of the erupting filament.

TL;DR: In the last decade and a half, radar has shown great growth in both diversity and depth in all areas of technology, fundamental research, and application, and many more are discussed within this review as mentioned in this paper.

TL;DR: A catalog of 1377 geomagnetic storms with peak Dst (Dstp)≤−50 nT for the period 1957-2008 has been compiled and the dependence of Dstp on the solar cycle and annual variation are studied in this paper.

TL;DR: Based on TIDI mesospheric wind observations, this paper analyzed the semidiurnal tide westward zonal wavenumber 1 and 2 (SW1 and SW2) component seasonal, inter-annual variations, and possible sudden stratospheric warming (SSW) related changes.

TL;DR: The authors reviewed past and ongoing analyses that have led to a current great wealth of 3D information, which can provide not only shapes of CME/ICMEs but also a characterization of any solar wind structure or global outflow.

TL;DR: In this article, the authors describe the scientific rationale for an L5 mission and a partial list of key scientific instruments the mission should carry, including a coronagraph and a heliospheric imager at L5.

TL;DR: In this article, the authors review and discuss recent efforts to use numerical simulations of ICMEs to investigate the magnetic topology, density structure, energetics and kinematics of interplanetary coronal mass ejections.

TL;DR: In this article, a physics-based radiation belt environment (RBE) model that considers the influences from the solar wind, ring current and plasmasphere was developed to understand and predict the radiation particle intensities.

TL;DR: In this article, the prediction of solar activity strength for solar cycles 24 and 25 is made on the basis of extrapolation of sunspot number spectral components, which are decomposed into several levels and searched for periodicities by iterative regression in each level.

TL;DR: The characteristics of storm time (corotating interaction regions (CIR)-driven storm that happened on 9 August 2008) equatorial electrojet (EEJ) phenomena and their effect on the ionospheric density structure at two different longitudinal sectors are presented in this paper.

TL;DR: In this paper, a sensitivity study for the applicability of this method has been performed for the first time using a mechanistic general circulation model with high spatial resolution and explicit description of gravity waves.

TL;DR: In this paper, two high speed stream (HSS) solar wind intervals (days 283-294 and 314-318, 2003) during the declining phase of solar cycle 23 have been examined in detail for their interplanetary characteristics and their resultant geomagnetic activity.

TL;DR: In this article, the lower atmospheric (tropospheric) variations are investigated using the total zenith tropospheric delay (ZTD) from GPS measurements around the Wenchuan earthquake.

TL;DR: In this article, the authors compare the TKE dissipation rates derived from the ozonesondes launched during the campaign with those obtained from direct ST radar measurements and find encouraging agreement between the two, which suggests that routine measurements of TKE disipation rates by radiosondes in the global free atmosphere might indeed be feasible.

TL;DR: In this paper, the size of a magnetic storm is measured by the maximum depression of the horizontal magnetic field at the Earth's equator, and the largest depression that could possibly occur can be estimated by noting that the geomagnetic field is inflated by plasma pressure in the magnetosphere that is enhanced above the effective pressure of the surrounding medium (magnetosheath and magnetotail), and that this pressure enhancement results largely from adiabatic compression as plasma is transported inward into dipolar flux tubes of decreasing volume.

TL;DR: In this paper, the authors analyzed variations of total electron content (TEC) over Japan during a period of low solar and geomagnetic activity in April-September 2008, and found that positive or negative abnormal TEC variations coincide with fluctuations of the global mean TEC or are of large spatial scale, i.e. much larger than the earthquake preparation zone.

TL;DR: In this paper, the authors review the pre-STEREO efforts in 3D CME reconstruction and compare them with the first STEREO results in this area, focusing on the techniques relevant to the CME morphology: forward modeling, polarimetric, spectroscopic, direct inversion.

TL;DR: In this article, the 20th century surface air temperature (SAT) records of China from various sources are analyzed using data which include the recently released Twentieth Century Reanalysis Project dataset.

TL;DR: In this article, the cyclic components of the data are analyzed and compared in the time-domain, and an 11-year oscillation in global mean temperature is found and compared with the Schwabe cycle from sunspot and total solar irradiance proxy data.

TL;DR: In this article, the authors analysed various lightning events using wavelet transform, including PB pulses, stepped leaders, first return strokes, subsequent strokes associated with negative ground flashes, positive return strokes and narrow bipolar pulses, and found that the energy radiated by the first subsequent strokes predominantly lies in the frequency range 4.5-55 kHz.