Mesospheric wind observations derived from Super Dual Auroral Radar Network (SuperDARN) HF radar meteor echoes at Halley, Antarctica: preliminary results

first_imgThe implementation of a technique to derive mesospheric winds from HF radar observations of meteor echoes at Halley (76°S, 27°W), Antarctica, is described. The meteor echoes are observed at near ranges (less than 400 km) and have characteristics distinctly different from echoes backscattered from plasma irregularities in the E and F regions of the ionosphere. A Lorentzian model is used to fit the echo spectrum. The echo occurrence rate has the diurnal variation expected of meteors with a minimum in the afternoon. There also appears to be an annual variation which may be related to seasonal changes in the atmosphere. At present, results are confined to a single beam; that directed toward the south geographic pole is presented here, as this will give the meridional component of the wind and can be compared with other studies. The meridional wind is found to be dominated by the semidiurnal tide most of the year, with maxima in spring and autumn. Data for May 1996 show that the semidiurnal tide is dominant, but there are significant contributions from the 24-hour and 8-hour tides. A moving window spectral analysis technique allows the temporal behavior of the waves over a 10-day period to be studied. A quasi 2-day wave is observed during this interval, and slight changes of period with time can be observed. Planetary waves with periods of 5 and 10 days are observed during the winter of 1996. The radar has been operating since 1988, and so these data form a substantial and valuable database of mesospheric observations in the high-latitude southern hemisphere.last_img read more

Stokes, Sibley grit helps England past 400

first_img(ESPNCricinfo) – Ben Stokes and Dom Sibley picked up where they left off on the opening day to guide England into a commanding position at the end of the second day with West Indies a wicket down and trailing on first innings by 437 runs.Having spent the best part of two days toiling hard in the field, an unchanged West Indies outfit from the one that won the first Test by four wickets in Southampton just five days ago, face a fresh English seam attack.Stuart Broad, Chris Woakes and Sam Curran all missed the last game but came into this one for the omitted Jofra Archer and the resting Mark Wood and James Anderson. Stokes, the fourth leg, will be understandably less crisp but he won’t turn down the chance to build on his contribution with the bat.Stokes faced 356 deliveries for his 176, his longest innings by far in terms of balls faced – he faced significantly fewer balls for his highest Test score of 258. Yes, it was slow going, but not as slow as Sibley’s 372-ball 120 and Stokes produced some jolt-you-awake shots when warranted, including an indignant shove all the way over long-on off Alzarri Joseph to add to his other six off Roston Chase the previous day.Chase could hold his head high, having claimed a five-wicket haul, but his side were left with it all to do after the stubborn-ness of Stokes and Sibley.Coming in with his side 81 for 3 on the first day, Stokes’ knock was the intelligent innings England required. It also carried with it the air of a man keen to go on after falling in the 40s in both innings at the Ageas Bowl.There were also 17 fours for Stokes, including the odd reverse sweep, one of which brought up his 10th Test century. It was another, attempted, reverse off Kemar Roach which brought about his undoing, but he had done his job.The moment wicketkeeper Shane Dowrich caught Stokes was hugely significant for Roach as it broke a Test wicket drought going back to August 31, 2019, and lasting 521 deliveries, or 86.5 overs.And just as he had done in that drought with two wickets in two balls, including Virat Kohli for a golden duck in Kingston, so he came out of it in the same manner, as Woakes was caught at gully next ball for a duck.Just as the tempo of Stokes’ knock can’t be criticised in England’s circumstances, or can Sibley’s, as sedate as it was. Sibley had been at the crease as fellow opener Rory Burns, Zak Crawley and Joe Root fell, meaning it was hardly the time to change his circumspect nature.Sibley resumed yesterday tantalisingly close to his second century, not out 86 with Stokes unbeaten on 59 and England 207 for 3. The pair added 57 runs in the morning session and Sibley seemed stuck in the 90s for an age. There was even the possibility of Stokes beating him to the milestone but Sibley got there first, pushing Joseph through mid-on for three.Stokes went to lunch on 99 but brought up his ton on the third ball he faced after the break. Sibley finally holed out to Roach off Chase, ending a 260-run stand with Stokes off 568 balls, which was England’s second-longest partnership this century.Off-spinner Chase bowled 44 overs – including 28 unchanged from the over before lunch to the end of the England innings – to claim 5 for 172.The quick turnaround between Tests was telling on West Indies’ quicks, with Shannon Gabriel moving gingerly from the start of the match and spending time off the ground in the hands of the team physio. Joseph also sought treatment for a sore biceps tendon as Roach toiled long and hard for his eventual reward, and Holder carried a heavy workload too.With swing in the air, Holder delayed taking the second new ball until the 94th over, about an hour into the day’s play. But even then, there was no breakthrough until well into the second session.Sibley’s dismissal brought Ollie Pope to the crease for a short-lived stay, but Jos Buttler stuck around long enough to add 40 off 79 balls. After Curran had provided Chase’s fifth wicket, Dom Bess added an unbeaten 31 off 26 before Root had seen enough.Joseph ended up returning to the middle sooner than he would have liked – as nightwatchman – when Curran had Windies opener John Campbell out lbw for 12 late in the evening session.SCOREBOARDENGLAND 1st innings (overnight 207 for three)R. Burns lbw b Chase 15D. Sibley c Roach b Chase 120Z. Crawley c Holder b Chase 0J. Root c Holder b Joseph 23B. Stokes c wkp. Dowrich b Roach 176O. Pope lbw b Chase 7J. Buttler c Joseph b Holder 40C. Woakes c Hope b Roach 0S. Curran c Brathwaite b Chase 17D. Bess not out 31S. Broad not out 11Extras: (b-4, lb-7, w-10, nb-8) 29Total: (9 wkts decl., 162 overs) 469Fall of wickets: 1-29, 2-29, 3-81, 4-341, 5-352, 6-395), 7-395, 8-426, 9-427.Bowling: Roach 33-9-58-2 (w-1, nb-3), Gabriel 26-2-79-0 (w-5, nb-4), Joseph 23.1-5-70-1, Holder 32-10-70-1, Chase 44-3-172-5, Brathwaite 3.5-0-9-0.WEST INDIES 1st inningsK. Brathwaite not out 6J. Campbell lbw b Curran 12A. Joseph not out 14Total: (1 wkt, 14 overs) 32Fall of wicket: 1-16 (Campbell)Bowling: Broad 5-1-14-0, Woakes 4-3-2-0, Curran 3-1-8-1, Bess 2-0-8-0.Position: West Indies trail England by 437 runs with nine first-innings wickets remaining.last_img read more

Women’s World Cup 2019: Carli Lloyd leads reigning champions into last 16

first_imgCarli Lloyd scored twice and missed a penalty as the United States cruised into the last 16 of the Women’s World Cup with a 3-0 win over Chile in Paris.On target as a substitute in the 13-0 humiliation of Thailand, co-captain Lloyd made the most of her elevation to the starting XI as she netted either side of Julie Ertz’s header in the first half. @CarliLloyd *loves* scoring goals for the @USWNT #USACHI | #FIFAWWC— FIFA Women’s World Cup (@FIFAWWC) June 16, 2019Lloyd hit the post with a good early opportunity but did not have to wait long for the opener, the 36-year-old lashing home following a poor defensive header in the 11th minute.Ertz headed in a Tierna Davidson corner to extend the margin before an unmarked Lloyd did likewise in the 35th minute, becoming the oldest player to score multiple goals in a single Women’s World Cup match. Chile goalkeeper Christiane Endler made a series of superb saves to keep the scoreline under control in the early stages of the second half, twice thwarting Christen Press.The woodwork then denied both substitute Jessica McDonald and record-breaker Lloyd, who should have completed her hat-trick after a VAR review deemed her to have been fouled in the box by Yessenia Huenteo.Lloyd stepped up but fired to the left of the upright, as Chile escaped without further damage. The celebrations — muted in comparison to the exuberant scenes that attracted criticism on Tuesday — were kept in check from there, though, with Lloyd unable to convert a controversially awarded penalty towards the end.Jill Ellis’ side now only need a draw against Sweden in Le Havre on Thursday to top Group F on goal difference, while Chile must beat Thailand to boost their hopes of advancing as one of four third-placed teams. Related Newscenter_img Women’s World Cup 2019: Updated group stage results and standings Women’s World Cup 2019: 3 takeaways from USA’s big win over Chilelast_img read more

Wenger anniversary underlines slipping standards

first_imgShare on: WhatsApp Beginning of end? However, Arsenal fans’ frustration at Wenger’s stubborn approach finally bubbled over — it had been simmering for several years — when Leicester, stealing his old formula of buying cheap foreign talent, won the title last season.“Wenger is a very pragmatic man and I would love to see him throw his economic principles out of the window for one season and see what happened,” Keown said.Forced to endure verbal abuse and calls for his resignation, Wenger has been battered like never before over the past 18 months.And failure again this season to win either the Premier League or Champions League could spell the end of one of English football’s most celebrated figures — and with it the closing of an era.  Golden period If pasta, grilled chicken and broccoli were the ingredients of Wenger’s recipe for success, he was just as ground-breaking in the cutthroat world of the transfer market.Establishing a scouting network far superior to any of his rivals, Wenger fused Arsenal’s battle-hardened defence with an influx of astute cut-price signings. London, United Kingdom | AFP | Arsene Wenger memorably announced his arrival as a revolutionary force in England by banning his players from eating sweets, but the Arsenal manager’s reign has turned increasingly sour as he marks the 20th anniversary of his appointment.Arguably the most significant agent of change in the Premier League era, the 66-year-old’s achievements in revitalising both Arsenal and English football will rightly be celebrated in this milestone week for the urbane Frenchman.Yet when Wenger makes the drive from his home in the exclusive north London suburb of Totteridge to the Emirates Stadium for Saturday’s clash with Chelsea it would be understandable if he pondered how he finds himself in danger of being viewed with the same disdain that greeted his hiring two decades ago.In an era when even the most unglamourous Premier League club can use the riches from lucrative television contracts to lure high-profile foreign coaches and players, it’s hard to recall just how insular the Premier League was when Wenger left Japan’s Nagoya Grampus Eight to join Arsenal in 1996.Few overseas stars plied their trade in England at the time and tabloid headlines sneered “Arsene who?” while Wenger’s professorial looks were easy fodder for doubting fans and some cynical members of Arsenal’s old-school squad.Given Wenger had no Premier League experience and first came to Arsenal vice-chairman David Dein’s attention not for his managerial acumen but for his skill at charades during a dinner party, it was a significant gamble by both parties to let the Frenchman loose on English football.It proved a masterstroke and, after coming third in the Premier League in Wenger’s first season, Arsenal never finished outside the top two for the next eight years.Overhauling Arsenal’s dietary and fitness regimes and introducing sports science and data analysis with remarkable results, Wenger was feted as the most innovative manager of his generation.“Nutrition was a big deal for Arsene. The dietician had a slogan, ‘Chew to win’, meaning he wanted us to chew our food for longer,” former Arsenal defender Martin Keown said.“We started feeling superhuman during games, fitter and stronger than ever.” Patrick Vieira, Thierry Henry, Nicolas Anelka and Emmanuel Petit arrived as unknowns and left as superstars, while Wenger crucially managed to coax extraordinary feats from Dutch forward Dennis Bergkamp.During that golden period, Arsenal won three Premier League titles and four FA Cups with a smooth-passing style that raised standards in a league previously more enamoured of brute force.In 2003-04, Arsenal’s “Invincibles” went undefeated in the league and two years later they almost conquered Europe before narrowly losing the Champions League final against Barcelona.But Wenger’s success was a double-edged sword as his peers closed the gap by pilfering his philosophy at a time when Arsenal were burdened by the financial restrictions from their move to the Emirates.Confronted by the new-found wealth of Chelsea and Manchester City, whose owners were attracted by the riches in the league Wenger played such a role in reshaping, Arsenal never finished higher than third between 2005-06 and 2014-15 while losing disillusioned stars like Cesc Fabregas and Robin van Persie.Wenger was never shy of pointing out how much other clubs were spending, while emphasising how Arsenal remained competitive and pleasing on the eye on a more restrained budget.last_img read more