The geomagnetic conditions were moderately disturbed (K-p=2) during magnetic midnight on 10 December 1999, when the Tasman International Geospace Environment Radar (TIGER), a Southern Hemisphere HF SuperDARN radar, observed a persistent, sharp latitudinal decrease (similar to90km) in spectral width near similar to69degreesA. The line-of-sight Doppler velocity also rapidly declined across this spectral width boundary (SWB). The region poleward of the SWB was characterized by high spectral widths (> 200 m/s), and the start of bursty equatorward and eastward flows (>500 m/s), which rapidly expanded equatorward. The relationships between familiar ionospheric and magnetospheric regions were inferred by comparing TIGER data with spectrograms calculated from precipitating particles measured on board the Defence Meteorology Satellite Program (DMSP) F14 satellite. The high spectral width scatter is often observed, and on this evening it was associated with irregularities forming on the open (but soon to be reconnected) field lines threading the polar cap ionosphere to the southern tail lobe. The region equatorward of the SWB was characterized by very low spectral widths (<50 m/s) and generally slower, more zonal flows (<300m/s). This kind of scatter is more transient, and was associated with irregularities residing on the closed field lines threading the discrete and diffuse auroral oval to the plasma sheet boundary layer (PSBL) and central plasma sheet (CPS). Hence, the SWB was a reasonable proxy for the open-closed field line boundary, and the equatorward limit of the region, with low spectral width, was probably aligned with the poleward wall of the main ionospheric trough. The SWB was observed to contract poleward and expand equatorward on time scales of similar to10 min, much as would be expected during balanced dayside and nightside reconnection. Total electron content (TEC) measurements made at Macquarie Island (-65degreesA) and Hobart (-54degreesA), and the ionograms recorded at the same stations, as well as at Bundoora (-49degreesA), also helped to validate the interpretation.
Meanwhile, Patient No. 4 (Western Visayas Patient No. 57) is a 50-year-old male form Candoni town. He had history of travel to Finland. He arrived in the country on March 17. Patient No. 3 (Western Visayas Patient No. 56)is a 38-year-old man, who traveled from The Netherlands and arrived in thePhilippines on March 24. He is a resident of Silay City. BACOLOD City – Two overseas Filipino workers(OFWs), who were recently repatriated in Negros Occidental, tested positive forSARS-CoV-2, the virus that causes the coronavirus disease 2019 (COVID-19). Meanwhile, despite of the four cases in NegrosOccidental, the national Inter Agency Task Force did not included the provinceas well as this capital city for an extension of the enhance communityquarantine. Gov. Eugenio Jose Lacson announced the latestconfirmed cases Thursday night, saying the two patients were on strictisolation at the Provincial Healing Center – a patient care center in E.B.Magalona town. “Both are OFWs (whom) we allowed to comehome. They came from Cebu and passed by our port in Escalante City. They areboth asymptomatic, which means they don’t have symptoms,” Lacson said in astatement. This city has recorded eight confirmedCOVID-19 cases. They were among the group of 35 OFWs whotraveled from the port of Tabuelan town in Cebu and arrived in Barcelona portin Escalante City. There were hundreds of specimen fromBacolod and Negros Occidental pending for confirmation at the Western VisayasMedical Center in Iloilo City./PN read more