Recently, strongly damped Doppler shift oscillations of hot (T > 6 MK) coronal loops were observed with the Solar Ultraviolet Measurement Emitted Radiation (SUMER) spectrometer on board and Heliospheric Observatory. The are interpreted as signatures slow-mode magnetosonic waves excited impulsively in loops. Using a one-dimensional MHD code, we model damping slow loop. We find that because high temperature loops, large thermal conduction, which depends T2.5, leads to rapid timescale...

We report observations of strongly damped Doppler shift oscillations detected in a flare line, Fe XIX, with the Solar Ultraviolet Measurement Emitted Radiation spectrometer. Spectra were recorded above an active region at western limb Sun, from lines formation temperatures ranging 0.01 to 10 MK. However, seen only hot plasma (>6 MK) lines. The have periods 14-18 minutes, exponential decay time 12-19 and show initial large blueshift pulse peak velocities up 77 km s-1. Several indications...

We give an extensive overview of Doppler shift oscillations in hot active region loops obtained with SUMER. The have been detected sampled 50-100 arcsec off the limb Sun ultraviolet lines, mainly and , formation temperature greater than 6 MK. spectra were recorded along a 300 slit placed at fixed position corona above regions. Oscillations are usually seen extended section often appear to be from several different portions (or loops). Different sometimes phase, out phase show shifts slit....

Abstract. We calculated the organic matter to carbon mass ratios (OM/OC ratios) in PM2.5 collected from 14 Chinese cities during summer and winter of 2003 analyzed causes for their seasonal spatial variability. The OM/OC were two ways. Using a balance method, averaged 1.92 ± 0.39 year-round, with no significant or variation. second calculation was based on chemical species analyses compounds extracted samples using dichloromethane/methanol water. ratio relatively high (1.75 0.13)...

The first evidence of transverse oscillations a multistranded loop with growing amplitudes and internal coupling observed by the Atmospheric Imaging Assembly on board Solar Dynamics Observatory is presented. oscillation event occurred 2011 March 8, triggered coronal mass ejection (CME). multiwavelength analysis reveals presence multithermal strands in oscillating loop, whose dynamic behaviors are temperature-dependent, showing differences their amplitudes, phases, emission evolution....

In the fall of 2007 concurrent air sampling field measurements were conducted for first time in Guangzhou (at Wan Qing Sha (WQS)) and Hong Kong Tung Chung (TC)), two cities rapidly developing Pearl River Delta region China that are only 62 km apart. This is known to suffer from poor quality, especially during autumn winter months, when prevailing meteorological conditions bring an outflow continental region. An interesting multiday O 3 pollution event (daily maximum > 122 ppbv) was...

We report the first detection of postflare loop oscillations seen in both Doppler shift and intensity. The observations were recorded an line by SUMER spectrometer on SOHO corona about 70 min after M-class flare solar limb. oscillation has a period 17 velocity intensity, but their decay times are different (i.e., 37 for 21 intensity). fact that intensity have exactly 1/4-period phase difference points to existence slow-mode standing waves oscillating loop. This interpretation is also...

We report on a loop oscillation event observed by TRACE in the 195 Å bandpass at solar limb. The difference images reveal first evidence for vertical kink oscillations of loop, i.e., alternately expanding and shrinking motions, contrast to horizontal transverse reported before, which exhibit swaying motions. Based 3D geometry oscillating derived from observation fitting with circular or elliptical model, we simulate these two kinds global modes find that only produce signature agreement...

Aims. We report the first evidence for transverse waves in coronal multithreaded loops with cool plasma ejected from chromosphere flowing along threads. These observations are good candidates seismology.

Abstract. An intensive field measurement study was conducted simultaneously at a site within the inland Pearl River Delta (PRD) region (WQS) and in Hong Kong (TC) between 22 October 1 December 2007. Ambient air pollutants measured included O3, NOx, CO, SO2, NMHCs, carbonyls. The purpose is to improve our understanding of interplay among local regional area, influence transport on pollutants. results indicate that mean levels WQS were much higher than those TC site, except NOx. Thirteen O3...

We report the first observation of multiple-periodic propagating disturbances along a fan-like coronal structure simultaneously detected in both intensity and Doppler shift Fe XII 195 A line with EUV Imaging Spectrometer (EIS) onboard Hinode. new application seismology is provided based on this observation. analyzed EIS sit-and-stare mode oscillations using running difference wavelet techniques. Two harmonics periods 12 25 min are detected. measured amplitude 1-2 km/s, relative 3%-5%...

Abstract. To advance our understanding on the factors that affect photochemical pollution at different elevations in mountainous areas, concurrent systematic field measurements (September to November 2010) were conducted a mountain site and an urban foot of Hong Kong. The mixing ratios air pollutants greater (i.e., Tsuen Wan site, TW) than near summit Tai Mao Shan TMS), expect for ozone. In total, only one O3 episode day was observed TW, whereas twenty-one (21) days TMS. discrepancy two...

Using data obtained by the EUV Imaging Spectrometer on board Hinode, we have performed a survey of obvious and persistent (without significant damping) Doppler shift oscillations in corona. We found mainly two types from February to April 2007. One type is at loop footpoint regions, with dominant period around 10 minutes. They are characterized coherent behavior all line parameters (line intensity, shift, width, profile asymmetry), apparent blueshift blueward asymmetry throughout almost...

We consider the relationship between two flare-associated waves, a chromospheric Moreton wave and coronal EIT wave, based on an analysis of X-class flare event in AR 8100 1997 November 4. A was observed $\mathrm{H}\alpha$, $\mathrm{H}\alpha {+} 0.8\,$$Å$, $\mathrm{H}\alpha-0.8\,$$Å$ with Flare-Monitoring Telescope (FMT) at Hida Observatory. An EUV Extreme ultraviolet Imaging (EIT) board SOHO. The propagation speeds were approximately $715 \,\mathrm{km} \,\mathrm{s}^{-1}$ $202...

We apply a new method to determine the magnetic field in coronal loops, using observations of loop oscillations. analyze seven Doppler-shift oscillation events detected by SUMER hot flare line Fe XIX obtain periods these events. The geometry, temperature, and electron density oscillating loops are measured from coordinated multichannel soft X-ray imaging SXT. All oscillations consistent with standing slow waves their fundamental mode. These parameters used calculate based on MHD wave theory....

We present the first Hinode/EUV Imaging Spectrometer observations of 5 minute quasi-periodic oscillations detected in a transition-region line (He ii) and five coronal lines (Fe x, Fe xii, xiii, xiv, xv) at footpoint loop. The exist throughout whole observation, characterized by series wave packets with nearly constant period, typically persisting for 4–6 cycles lifetime 20–30 minutes. There is an approximate in-phase relation between Doppler shift intensity oscillations. This provides...

Solar magnetized "tornadoes," a phenomenon discovered in the solar atmosphere, appear as tornado-like structures corona but are rooted photosphere. Like other phenomena, tornadoes feature of plasma and therefore differ distinctly from terrestrial tornadoes. Here we report first analysis "tornadoes" (two papers which focused on different aspects were published Astrophysical Journal Letters Nature, respectively, during revision this Letter). A detailed case study two events indicates that they...

Abstract An online coupled regional climate‐chemistry model called RegCCMS is used to investigate the interactions between anthropogenic aerosols and East Asian summer monsoon (EASM) over Asia. The simulation results show that mean aerosol loading optical depth region are 17.87 mg/m 2 0.25, respectively. Sulfate black carbon (BC) account for approximately 61.2% 7.8% of total aerosols, radiative forcing (RF) −3.64, −0.55, +0.88 W/m at top atmosphere effect, direct BC surface RF accounts 31%...

An observation from the Interface Region Imaging Spectrograph reveals coherent oscillations in loops of an M1.6 flare on 2015 March 12. Both intensity and Doppler shift Fe~{\sc{xxi}}~1354.08Å~show clear with a period $\sim$25 seconds. Remarkably similar were also detected soft X-ray flux recorded by Geostationary Operational Environmental Satellites (GOES). With estimated phase speed $\sim$2420~km~s$^{-1}$ derived electron density at least 5.4$\times$10$^{10}$ cm$^{-3}$, observed...