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There are 44 items available. Please enter a number less than or equal to Select a valid country. Please enter 5 or 9 numbers for the ZIP Code. Delivery times may vary, especially during peak periods. Scientists have been using ground-based instruments to monitor Northern Hemisphere plasma patches for decades, and up until recently thought they had a good handle on how they function. North of the equator, scientists observed most of these patches during the winter, particularly in months of December and January.
With virtually no ground-based observing stations south of the equator, data for the southern hemisphere was difficult to come by. Once satellites started collecting data, researchers expected to observe the same pattern of heightened activity during the southern hemisphere's winter months, June and July, and lulls in the summer. But that's not what they saw. Previously researchers had theorized that the Sun's direct rays in the summer elevated the overall charge of the Earth's ionosphere, effectively washing out the plasma patches, which is why they were rarely observed in summer.
But now with these contradictory satellite observations, they're looking for a new explanation as to why the prevalence of these patches aren't seasonal, and happen on both ends of the planet in December and January.
Chartier traveled to Antarctica to set up instruments to measure how frequently these patches pass over a particular region of the continent by analyzing its effects on radio signals. At the South Pole, about miles away, he installed a radio receiver to listen for the radio signals coming from McMurdo. Chartier is using this effect to measure these plasma patches as they pass over the continent.
Every minute the radio transmitter Chartier installed at McMurdo broadcasts a signal that starts out in the low frequencies then progresses into higher and higher frequencies. At the South Pole his receiver is listening for the highest-frequency signal it can hear bounced off the underside of the ionosphere.
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Located in:. Houston, Texas, United States. For additional information, see the Global Shipping Program terms and conditions - opens in a new window or tab This amount includes applicable customs duties, taxes, brokerage and other fees. Estimated between Fri. Delivery times may vary, especially during peak periods. Seller does not accept returns See details. Special financing available. See terms and apply now See terms and apply now for PayPal Credit - opens in a new window or tab.
Any international shipping and import charges are paid in part to Pitney Bowes Inc. Learn More - opens in a new window or tab International shipping and import charges paid to Pitney Bowes Inc. Learn More - opens in a new window or tab Any international shipping and import charges are paid in part to Pitney Bowes Inc. Learn More - opens in a new window or tab Any international shipping is paid in part to Pitney Bowes Inc.
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