Pc1 geomagnetic pulsations, equivalent to electromagnetic ion cyclotron waves in the magnetosphere, display a specific amplitude modulation, though the region of the modulation remains an open issue. To classify whether the amplitude modulation has a magnetospheric or ionospheric origin, an isolated proton aurora (IPA), which is a proxy of Pc1 wave–particle interactions, is compared with the associated Pc1 waves for a geomagnetic conjugate pair, Halley Research Base in Antarctica and Nain in Canada. The temporal variation of an IPA shows a higher correlation coefficient (0.88) with Pc1 waves in the same hemisphere than that in the opposite hemisphere. This conjugate observation reveals that the classic cyclotron resonance is insufficient to determine the amplitude modulation. We suggest that direct wave radiation from the ionospheric current by IPA should also contribute to the amplitude modulation.
After a quiet season, Dyke finally showed his hand in the 4×400 metres. They came to the Relays as underdogs despite retaining three members of last year’s winning team as St Elizabeth Technical, with the hot Junelle Bloomfield on their team, were howling favourites to bring home their first title in the event. However, Dyke silenced the very overconfident St Elizabeth Technical. It was a plucky Holmwood Technical who gave them much to worry about. Holmwood, the record holders in the event, looked like pulling off a win, but their outstanding Ashley Williams fell on the anchor leg and Edwin Allen went on to win in 3:40.88. St Elizabeth Technical was second in 3:41.17, with Union Catholic out of New Jersey third in 3:42.59. Unlucky, Holmwood ended at the back of the field in 4:03.74. Shannon Kalawan, who ran the third leg for her team, was delighted with the win. “We came to Penn Relays as underdogs, but we were very confident that we would have won. I am extremely happy that I played my part by giving the team the lead, and it was good to be on the podium for the second time on the day, and I want to give God thanks for this,” said Kalawan, who finished second in the 400 metres hurdles on Thursday’s opening day. The other members of the team were Joneil Moore and Davia Smith. PHILADELPHIA, Pennsylvania: Edwin Allen High’s girls were brilliant on yesterday’s penultimate day of competition at the 122nd renewal of the Penn Relays in Philadelphia yesterday. The Clarendon-based school had two three-peats as they captured the 4x100m and 4x400m for the third consecutive year at the prestigious relay carnival. Unlike Thursday’s opening day when it was very cold, things warmed up yesterday and this lifted the performances. Despite coming into the finals of the 4×100 metres as the second-fastest qualifiers behind Holmwood Technical, Edwin Allen had few problems in achieving victory. They shrugged off early pressure from first-time finalists St Catherine High on the first two legs. Then the classy Shellece Clarke on the third leg put her team into the lead. Khamoy Farquharson on anchor then coasted home as Edwin Allen clocked to win in 45.73 seconds. St Catherine finished second in 46.11, with Nansemond River out of Virginia third in 46.26. Holmwood were fifth in 46.66 and Green Island seventh in 47.85. The other members of the winning Edwin Allen team were Kasheika Cameron and Patrice Moodie. Coach Dyke hailed his girls as before the race, he had told them that winning was the main focus. “Based on the preliminary round, we were very confident of victory, and with the type of weather, I told the girls that our main focus was just to win. The time was not important as the objective was for them to get on top of the podium,” said Dyke, who added that his young team could win the event for another three years. UNDERDOGS IN RELAYS
(Eds: Collating relevant stories, results and quotes) Buenos Aires, Oct 9 (PTI) India’s next generation of athletes scripted history not once but twice in the space of 24 hours as weightlifter Jeremy Lalrinnunga and shooter Manu Bhaker picked up the country’s maiden set of gold medals in the Youth Olympics here on Tuesday. The 15-year-old Lalrinnunga shattered the national record in the men’s 62kg category to claim the top honours and announce his arrival at the big stage. Bhaker, on the other hand, rediscovered the form that made her a sensation in the women’s 10m air pistol event. Lalrinnunga, who is also a world youth silver-medallist, lifted a total of 274kg (124kg +150kg) to finish on top in the Argentine capital on Monday night, which was early Tuesday morning in India. “I am feeling really happy that I won the gold medal here,” Lalrinnunga told PTI. The 16-year-old Bhaker shot 236.5 to finish on top of the podium on Tuesday, making up for the heartbreak at the Asian Games in Indonesia and the World Championship where she could not live up to her billing. “This is an important win for me. It will be a morale booster (after the Asian Games disappointment) as I look forward with an aim to bring home more laurels,” Bhaker said after winning the gold. Mizo sensation Lalrinnunga, who will turn 16 on October 26, is the son of a former boxer, Lalneihtluanga, who has seven national-level gold medals to his credit. Lalrinnunga was himself an aspiring boxer before he shifted to weightlifting on the advice of coaches and was picked up by the Army Sports Institute scouts in 2011 at the age of 8.advertisement Earlier this year, Lalrinnunga claimed a silver (youth) and a bronze (junior) in the Asian Championships, smashing two national records in the process. On Tuesday, Bhaker began the eight-woman final with a 10.0 and followed it up with a 10.1 and 10.4. She led the Stage 1 with 99.3 after a sequence that included seven scores of 10 and above. Two 9.8 in the beginning of second stage (elimination) were followed by a 10.1 and 9.9, helping her maintain the lead over Thailand’s Kanyakorn Hirunphoem by some distance. The World Cup and Commonwealth Games gold medallist extended her domination in the following shots and looked to be on course for the yellow metal. She slipped once to the second place but quickly regained the top position. Earlier, Bhaker topped the qualifying with 576, which included a series of 95, 96, 96, 96, 95, 98 and placed second and third in the qualification were Russia’s Enina Iana and Chinese Lu Kaiman with 569, the gulf in scores clearly highlighting the form the Indian was in. Representing the country in the women’s 10m air pistol event, Bhaker has won medals at all major events she has participated barring the recent Asian Games. While Lalrinnunga and Bhaker made the nation proud, weightlifter Sneha Soren could not finish on the podium in the women’s 48kg category, signing off fifth. In swimming, Srihari Nataraj, who competed in the 100m backstroke final despite being a reserve, could only manage a sixth position. In other events, Archana Kamath and Manav Thakkar, India’s representatives in table tennis, won their singles matches of the group stage. Kamath beat Malaysia’s Javen Choong 4-2 while Thakkar defeated Slovakia’s Aleksandra Vovk 4-1. It was a big win for India in hockey as the team thrashed Austria 9-1. Rising badminton sensation Lakshya Sen had it tough against Danylo Bosniuk in the first game before he regained his composure to beat the Ukrainian 23-21, 21-8. India have already won four medals with Tushar Mane and Mehuli Ghosh bagging a silver each in 10m rifle shooting while Thangjam Tababi Devi won India’s first medal in judo by finishing second in the 44kg category. India won just two medals — a silver and a bronze — in the last Youth Olympics in 2014 in Nanjing in China. In the inaugural 2010 edition in Singapore, the nation fetched six silver and a couple of bronze medals. The country is being represented by 47 athletes at the ongoing Games, its biggest ever contingent. PTI AH BS PM PDSPDS