Research Progresses of Ionospheric Plasma Irregularities from the Ground–Based Airglow Network in China

2021 ◽  
Author(s):  
Jiyao Xu ◽  
Wei Yuan ◽  
Kun Wu ◽  
Longchang Sun
Keyword(s):  
Ionospheric Plasma ◽  
Ionospheric Disturbance ◽  
Geomagnetic Latitude ◽  
Extreme Weather Events ◽  
Plasma Bubble ◽  
Low Latitude ◽  
Plasma Irregularities ◽  
Middle Latitudes ◽  
Weather Events ◽  
New Phenomena

<p>China, from north to south, spans from the middle latitudes to the low latitude both in geographic latitude and geomagnetic latitude. And China has a variety of topography environment, which including high lands, plains, seas, and long coasts. To better understand topographic and latitudinal effects on the mesosphere and thermosphere and features of ionospheric plasma irregularities at various latitudes in China, we have established a ground-based airglow network in China gradually since 2010, which consists of 16 stations. This network almost cover China, which focuses on two airglow layers: the OI (~250 km) and OH (~87 km) airglow layers. The observations from OI airglow layers provide convenience to systematically investigate the morphologic feature and evolution of ionospheric plasma irregularities over China. Based on the airglow network observations, we mainly report some important research results of ionospheric plasma irregularities in recent years. These findings include (1) statistical characteristic of equatorial plasma bubble (EPB) over China, (2) the influences of severe extreme weather events on the ionosphere, (3) interaction between medium-scale traveling ionospheric disturbance (MSTIDs) and ionospheric irregularity, and (4) some new phenomena of ionospheric irregularities.</p>

scholarly journals Study of Equatorial Plasma Bubbles Using ASI and GPS Systems

2020 ◽  
Author(s):  
Dada P. Nade ◽  
Swapnil S. Potdar ◽  
Rani P. Pawar
Keyword(s):  
Electron Content ◽  
Gps Receiver ◽  
Plasma Bubble ◽  
Low Latitude ◽  
Total Electron ◽  
Plasma Irregularities ◽  
Plasma Bubbles ◽  
F Region ◽  
Equatorial Plasma Bubbles ◽  
Background Density

The plasma irregularities have been frequently observed in the F-region, at low latitude regions, due to the instability processes occurring in the ionosphere. The depletions in electron density, as compared to the background density, is a signature of the plasma irregularities. These irregularities are also known as the “equatorial plasma bubble” (EPB). These EPBs can measure by the total electron content (TEC) using GPS receiver and by images of the nightglow OI 630.0 nm emissions using all sky imager (ASI). The current chapter is based on the review on the signature of the EPBs in TEC and ASI. measurements. We have also discussed the importance of the study of EPBs.

3-D Ionospheric Plasma Bubble Model for Ground-Based Augmentation System

2015 ◽  
Vol 781 ◽  
pp. 102-105
Author(s):  
Sarawoot Rungraengwajiake ◽  
Pornchai Supnithi
Keyword(s):  
Ionospheric Plasma ◽  
Satellite System ◽  
Ionospheric Irregularity ◽  
Storm Events ◽  
Plasma Bubble ◽  
Low Latitude ◽  
Aircraft Navigation ◽  
Time Simulation ◽  
Latitude Region ◽  
Global Navigation Satellite

The ground-based augmentation system (GBAS) is now an important system for assisting the global navigation satellite system (GNSS) based aircraft navigation during landing phases. Since the ionospheric irregularity is one of the most serious problem in the high-precision GBAS, the impacts of ionospheric irregularities to GBAS in many countries need to be studied before actual installation and operation. However, most of previous studies are based on the rare ionospheric storm events observed in US in the mid-latitude region. For Thailand, which is located in equatorial and low-latitude region, the ionospheric irregularity known as plasma bubble is a common phenomenon after sunset, considered to have adverse impact to the integrity of GBAS operation. In this paper, we propose a simple 3-D ionospheric plasma bubble model for studying its impacts on GBAS operation in Thailand. The background electron density generated by the NeQuick2 model combined with the rectangular depletion are used in the near real-time simulation.

Near real time plasma irregularity monitoring by FORMOSAT-7/COSMIC-2

2020 ◽  
Author(s):  
ShihPing Chen ◽  
Charles C. Lin ◽  
Rajesh Panthalingal Krishnanunni ◽  
Richard Eastes ◽  
Jong-Min Choi
Keyword(s):  
Real Time ◽  
Global Scale ◽  
Plasma Bubble ◽  
Low Latitude ◽  
Plasma Irregularities ◽  
Ion Drift ◽  
F Region ◽  
Low Latitudes ◽  
Bottom Side

<p>The near real-time global plasma bubble map is constructed by utilizing the FORMOSAT-7/COSMIC-2(F7/C2) radio occultation(RO) scintillation observations in low latitudes. Several tools investigating plasma bubbles like the rate of TEC index(ROTI), Range-Time-Intensity(RTI) diagrams of the Jicamarca Unattended Long-term Investigations of the Ionosphere and Atmosphere(JULIA), and the Global-scale Observations of the Limb and Disk(GOLD) 135.6nm airglow observations are provided validating the RO scintillations. Result shows that the F7/C2 scintillation is sensitive detecting plasma irregularities, especially for the bottom side of these bubbles, which can be used to investigating nighttime vertical plasma drifts in low latitudinal F-region. The hourly quick look of the low latitude plasma bubble occurrence and vertical ion drift around the globe is significant to the space weather monitoring.</p>

scholarly journals RELATIONSHIP BETWEEN THE SCINTILLATION AND IONOSPHERIC IRREGULARITIES OVER KOTOTABANG (0.2S, 100.3E)

2019 ◽  
Author(s):  
Dyah Rahayu Martiningrum
Keyword(s):  
Geomagnetic Latitude ◽  
Strong Relationship ◽  
Scintillation Index ◽  
Ionospheric Scintillation ◽  
Plasma Bubble ◽  
Plasma Irregularities ◽  
Data Output ◽  
Spread F ◽  
Many Sources ◽  
Field Aligned Irregularities

Scintillation is a satellite signal reception interference phenomena due to plasma instabilities and plasma irregularities in the ionosphere layer. Scintillation can be caused by many sources. Therefore, this study was conducted to confirm the source of interference in the case study scintillation events at any given time. The interference will increase as the 11-year cycle of solar activity. In this research, scintillation was analyzed using GISTM (GPS Ionospheric Scintillation and TEC Monitor) Pontianak data output for the Field Aligned Irregularities occurrences on MArch 1 and March 8, 2011. Assume that Pontianak and Kototabang located at adjacent geomagnetic latitude and plasma bubble occurred along the region (low latitude and equator region). Field Aligned Irregularities (FAI) obtained from Equatorial Atmosphere Radar (EAR) data and the results of GRBR data analysis for LSWS was used for confirming scintillation events. The results indicate a strong relationship between the occurrences of scintillation and FAI. Further analysis using ionosonde data for spread F occurrences from CADI Pontianak and IPS 71 Tanjungsari showed that spread F occurrence on March 1 and March 8, 2011 confirmed by improvement of signal from the EAR data. Scintillation index also showed strong effect at the appropriate time. These results confirmed the hypothesis that the scintillation occurrences due to irregularities of the ionosphere layer

Modelling the Bioclimatic Niche of a Cohort of Selected Mite Species (Acari, Acariformes) Associated with the Infestation of Stored Products

2019 ◽  
Vol 53 (5) ◽  
pp. 399-416
Author(s):  
V. M. Tytar ◽  
Ya. R. Oksentyuk
Keyword(s):  
Potential Evapotranspiration ◽  
Species Distribution Modeling ◽  
Mite Species ◽  
Extreme Weather Events ◽  
Stored Products ◽  
Weather Events ◽  
Moisture Regimes ◽  
Bioclimatic Variables ◽  
Contemporary Climate ◽  
Future Management

Abstract In this study an attempt is made to highlight important variables shaping the current bioclimatic niche of a number of mite species associated with the infestation of stored products by employing a species distribution modeling (SDM) approach. Using the ENVIREM dataset of bioclimatic variables, performance of the most robust models was mostly influenced by: 1) indices based on potential evapotranspiration, which characterize ambient energy and are mostly correlated with temperature variables, moisture regimes, and 2) strong fluctuations in temperature reflecting the severity of climate and/or extreme weather events. Although the considered mite species occupy man-made ecosystems, they remain more or less affected by the surrounding bioclimatic environment and therefore could be subjected to contemporary climate change. In this respect investigations are needed to see how this will affect future management targets concerning the safety of food storages.

Urban Population Knowledge of Climate Change in Costa Rica and Nicaragua

2013 ◽  
pp. 55-76
Author(s):  
Sergio A. Molina Murillo
Keyword(s):  
Climate Change ◽  
Developing Countries ◽  
Costa Rica ◽  
Urban Population ◽  
Public Understanding ◽  
Extreme Weather Events ◽  
Negative Consequences ◽  
Weather Events ◽  
International Policies ◽  
General Concern

Most scenarios indicate that people in developing countries are more vulnerable and less capable of adapting to climate change. Since our public understanding of risk toward climate change in developing countries is limited, this article presents results from Costa Rica and Nicaragua, two countries which are socio-economically distinct, but which are expected to suffer similar extreme weather events. From October of 2008 until May 2010, a total of 1,047 respondents were surveyed in cities of both countries. The main results indicate that climate change is a widely known concept but other notions such as “carbon footprint” are foreign to most respondents. Despite the general concern with its negative consequences, respondents’ foremost concern is linked to their socioeconomic situation, and how it will be impacted by climate change in such aspects as poverty and social security. The results presented here contribute to advance national and international policies aiming to support mitigation or adaptation strategies in developing countries.

Reliability, Resilience and the Oncoming Wave of Retiring Baseload Units, Volume I: The Critical Role of Thermal Units During Extreme Weather Events

2018 ◽  
Author(s):  
Peter C. Balash, PhD ◽  
Kenneth C. Kern ◽  
John Brewer ◽  
Justin Adder ◽  
Christopher Nichols ◽  
...  
Keyword(s):  
Critical Role ◽  
Extreme Weather ◽  
Extreme Weather Events ◽  
Weather Events
Sign in / Sign up

Export Citation Format

Share Document