Seasonal variations of the gravity wave momentum flux in the Antarctic mesosphere and lower thermosphere


first_imgAirglow imager and dynasonde/imaging Doppler interferometer (IDI) radar wind measurements at Halley Station, Antarctica (75.6degreesS, 26.6degreesW) have been used to estimate the seasonal variation of the vertical fluxes of horizontal momentum carried by high-frequency atmospheric gravity waves. The cross-correlation coefficients between the vertical and horizontal wind perturbations were calculated from sodium (Na) airglow imager data collected during the austral winter seasons of 2000 and 2001. These were combined with wind velocity variances from coincident radar measurements to estimate the daily averaged upper limit of the vertical flux of horizontal momentum due to gravity waves. The resulting momentum flux at the Na airglow altitudes, while displaying a large day-to-day variability, showed a marked rotation from the northwest to the southeast throughout the winter season. Calculations show that this rotation is consistent with seasonal changes in the wind field filtering of gravity waves below the Na airglow region. The calculations also indicate that while the magnitude of the meridional wind is small, this filtering leads to the observed seasonal changes in the meridional momentum flux.last_img read more

News story: Near miss with a track worker at Ynys Hir


first_imgThis item has been moved to the National Archives as RAIB has published its Safety Digest describing this incident. See Safety Digest 06/2019: Ynys Hir, Ceredigion.,At around 11:58 hrs on 2 April 2019, a track worker was nearly hit by a passenger train at Ynys Hir, between Dovey Junction and Borth stations. The trackworker was one of a group walking along the track to a railway access point. The train was travelling at approximately 95 km/h (59 mph) when the driver applied the emergency brake and was slowing down as the track worker moved clear immediately before the train passed.We have undertaken a preliminary examination into the circumstances surrounding this incident. Having assessed the evidence which has been gathered to date, we have decided to publish a safety digest.The safety digest will be made available on our website in the next few weeks.last_img read more

Retail rebirth


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Tangerang police arrest 11 union members over alleged incitement during omnibus protest


first_imgRead also: Key points of labor reform in omnibus bill on job creation: What we know so farNining has called for the police to release the 11 union members and not to arrest more labor union members for provocation to avoid further “social disturbance”.“The arrests were arbitrary,” she added. “It happened in the middle of the night as if they were corruption suspects.”At the time of reporting, the KASBI advocacy team and union leaders are in mediation with the Tangerang Regency police.The police did not immediately respond to the Post’s request for an interview.On Feb. 17, an unknown group of people staged a protest without any prior notice at the KASBI secretariat in Pulo Gadung district, East Jakarta.The protesters spoke briefly spoke about the omnibus bill before they started burning tires and demanding KASBI be dissolved, according to Nining.“This is an act of terror against our unions. We believe that this [protest] occurred because of our stance on the omnibus bill,” she said on Feb. 17.The government considers the bill on job creation essential for attracting foreign investment to help improve economic growth and boost the nation’s ease of doing business. If passed, the omnibus bill would amend about 1,200 articles in more than 80 prevailing laws.Read also: Guide to omnibus bill on job creation: 1,028 pages in 10 minutesWorkers, however, have been campaigning firmly against the bill, having held demonstrations since January. They rejected the omnibus bill after rumors surfaced that it would reduce severance payments, enforce an hourly pay system to replace the minimum wage and eliminate sanctions against companies that failed to provide health insurance.The government has formed a consultative team consisting of government officials, businesspeople and labor representatives to discuss the bill.However, major labor groups including the KASBI, the Confederation of Indonesian Trade Unions (KSPI) and the All-Indonesia Workers Union Confederation (KSPSI) have declined to join the coordination team. Topics : Seven of the 11 union members are KASBI members and the remaining two are members of the All-Indonesia Workers’ Union (SPSI).“They were picked up by the police between 1 a.m. and 3 a.m. when they were coming home from the night shift at their respective workplaces,” the chairwoman said over the phone.She said the police suspected them of “provocation” during several labor union protests against the omnibus bill on job creation.According to Article 160 of the Criminal Code (KUHP), the arrested union members could face up to six years in prison if found guilty of incitement. The Tangerang regency police have taken 11 labor union members into custody for alleged incitement during protests over the omnibus bill on job creation.Congress Alliance of Indonesian Labor Unions (KASBI) chairwoman Nining Elitos told The Jakarta Post that two of the detainees were KASBI administrators, namely Joe, also known as Imron, and Siswoyo.  Read also: Labor unions protest Jokowi’s omnibus billlast_img read more