Direct Comparisons Between Neutral Wind, Temperature, and Airglow Brightness Measurements and Plasma Drift, Temperature, and Density Observations at Sondre Stromfjord Greenland

Details Direct Comparisons Between Neutral Wind, Temperature, and Airglow Brightness Measurements and Plasma Drift, Temperature, and Density Observations at Sondre Stromfjord Greenland Direct Comparisons Between Neutral Wind, Temperature, and Airglow Brightness Measurements and Plasma Drift, Temperature, and Density Observations at Sondre Stromfjord Greenland

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsa21b..05n&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SA21B-05

Physics

0310 Airglow And Aurora, 0355 Thermosphere: Composition And Chemistry, 2427 Ionosphere/Atmosphere Interactions (0335), 3369 Thermospheric Dynamics (0358)

Scientific paper

An NSF facility at Sondre Stromfjord Greenland houses both an incoherent scatter radar and a Fabry Perot interferometer. The two instruments measure characteristics of the ionosphere and the neutral atmosphere at two common altitudes determined by the emission altitudes of the metastable atomic oxygen greenline and redlines. The current solar cycle 23 has experienced a long minimum period providing a unique opportunity to characterize the baseline upper atmosphere. Coincident observations of common volume are infrequent between the two experiments often due to cloud cover obscuring the Doppler shifted line of sight airglow for the Fabry Perot interferometer. A clear night of common measurements began on 15 January 2007 and continued until dawn the next morning. The geomagnetic Kp index was relatively low for the entire period except between 03 and 06 UT when it rose to 5. This paper will describe the common volume coincident measurements for this data set. At approximately 05 UT, both instruments observed representative signatures of geophysical activity above Sondre Stromfjord. In terms of temperature, the trend observed by the radar in ion temperature matched that of the upper thermosphere neutral temperature. The horizontal neutral wind suggested abatement in the meridional component prior to substorm onset followed by the formation of strong equatorward flow in the morning sector. The plasma drift observations at 250 km altitude do not indicate any substantial reduction in the meridional component coincidental with the neutral data, and a clear sunward flow in the morning sector following the substorm.

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