Ionospheric scintillation over Antarctica during the storm of 5-6 April 2010

first_imgOn 5 April 2010 a coronal mass ejection produced a travelling solar wind shock front that impacted the Earth’s magnetosphere, producing the largest geomagnetic storm of 2010. The storm resulted in a prolonged period of phase scintillation on Global Positioning System (GPS) signals in Antarctica. The scintillation began in the deep polar cap at South Pole just over 40 minutes after the shock front impact was recorded by a satellite at the first Lagrangian orbit position. Scintillation activity continued there for many hours. On the second day significant phase scintillation was observed from an auroral site (81{degree sign} S) during the post-midnight sector in association with a substorm. Particle data from polar orbiting satellites provide indication of electron and ion precipitation into the Antarctic region during the geomagnetic disturbance. Total Electron Content (TEC) maps show enhanced electron density being drawn into the polar cap in response to southward turning of the interplanetary magnetic field. The plasma enhancement structure then separates from the dayside plasma and drifts southward. Scintillation on the first day is coincident spatially and temporally with both a plasma depletion region in the dayside noon sector, and in the dayside cusp. On the second day scintillation is observed in the nightside auroral region, and appears to be strongly associated with ionospheric irregularities caused by E-region particle precipitation.last_img read more

Mouthing off

first_img“When I told her the posh chocolate biscuits had been listed in the press, she retorted ’well, you don’t expect me to eat Family Circle under this kind of pressure do you?’ No, I don’t, because she has been bang on in her judgment and the way she has handled our office accounts”- expenses scandal-hit Mid Beds MP Nadine Dorries attributes a taxpayer cost of £34.38 for two packs of luxury biscuits to her office administrator Pippa, “who does have one flaw – biscuits”, after MPs expenses claims were made public”If I didn’t laugh I’d cry! It was an emotional journey for me. I did really need that money to pump into my business and I was kind of relying on it. But I’ve since bitten the bullet and taken out a bank loan to fund the renovations. It was a bit of a shock but I got over it after a couple of days – it’s just one of those things”- 33-year-old cake maker Rachel Edwards from Ecclesall puts on a brave face after banking on the prize money from appearing on Channel 4’s Deal or No Deal, but walking away as the show’s lowest ever prize winner, with just 17p of prize moneylast_img read more