A Search for Signatures of Ion Acoustic Shoulders in the SERSIO sounding rocket data set

Computer Science – Sound

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

7894 Instruments And Techniques, 2407 Auroral Ionosphere (2704), 2409 Current Systems (2708), 2704 Auroral Phenomena (2407)

Scientific paper

Although first predicted in the early 1960's, enhanced Ion Acoustic Shoulders have only been observed by incoherent scatter radars since the late 1980's. The signature of an IAS is seen as a positive and negative frequency shift about the center radar frequency. These features occur at altitudes of 150 to over 600 km, peaking at 500 km, with spatial extent (perpendicular to the magnetic field) the order of 10 km. The occurrence distribution shows a maximum in the pre-midnight region, with a secondary peak on the dayside (Rietveld et al 1995). Observations of strong (1000 mA/m2), localized currents by EISCAT have led to theories based on current-driven instabilities as the source of these waves (Forme, 1993; St.-Maurice et al., 1996). The SERSIO (Svalbard EISCAT Rocket Study of Ion Outflows) sounding rocket mission was launched into CME-driven dayside aurora on the 22nd of January 2004 at 0857 UT (0436 MLT) from Ny-Alesund (78o 55' 11" N, 11o 56' 60" E) and reached an apogee of 782 km. During the flight, the EISCAT incoherent scatter radar network supported the mission by monitoring altitude profiles of electron and ion density, velocity and temperature. From Longyearbyen, located approximately 50 km south east of Ny-Alesund and near the trajectory of SERSIO, the 32m ESR dish was tracking the ionospheric footprint of the payload while the 42 m dish was making local field-aligned measurements. The data from these radars clearly indicated the presence of enhanced ion acoustic shoulders, suggesting that SERSIO flew through a 'field' of Ion Acoustic Shoulders. In fact, the plasma wave environment observed by SERSIO was composed of traditional VLF hiss and Broad Band ELF hiss with wavelengths less than the order of 6m. Here we present the result of our search for Ion Acoustic Shoulders in the SERSIO data set.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

A Search for Signatures of Ion Acoustic Shoulders in the SERSIO sounding rocket data set does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A Search for Signatures of Ion Acoustic Shoulders in the SERSIO sounding rocket data set, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Search for Signatures of Ion Acoustic Shoulders in the SERSIO sounding rocket data set will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1466188

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.