TY  - JOUR
A1  - Park, J.
A1  - Luehr, H.
A1  - Stolle, Claudia
A1  - Malhotra, G.
A1  - Baker, J. B. H.
A1  - Buchert, Stephan
A1  - Gill, R.
T1  - Estimating along-track plasma drift speed from electron density measurements by the three Swarm satellites
JF  - Annales geophysicae
N2  - Plasma convection in the high-latitude ionosphere provides important information about magnetosphere-ionosphere-thermosphere coupling. In this study we estimate the along-track component of plasma convection within and around the polar cap, using electron density profiles measured by the three Swarm satellites. The velocity values estimated from the two different satellite pairs agree with each other. In both hemispheres the estimated velocity is generally anti-sunward, especially for higher speeds. The obtained velocity is in qualitative agreement with Super Dual Auroral Radar Network data. Our method can supplement currently available instruments for ionospheric plasma velocity measurements, especially in cases where these traditional instruments suffer from their inherent limitations. Also, the method can be generalized to other satellite constellations carrying electron density probes.
KW  - Ionosphere
KW  - Plasma convection
Y1  - 2015
U6  - https://doi.org/10.5194/angeo-33-829-2015
SN  - 0992-7689
SN  - 1432-0576
VL  - 33
IS  - 7
SP  - 829
EP  - 835
PB  - Copernicus
CY  - Göttingen
ER  - 
TY  - JOUR
A1  - Park, Jaeheung
A1  - Stolle, Claudia
A1  - Xiong, Chao
A1  - Lühr, Hermann
A1  - Pfaff, Robert F.
A1  - Buchert, Stephan
A1  - Martinis, Carlos R.
T1  - A dayside plasma depletion observed at midlatitudes during quiet geomagnetic conditions
JF  - Geophysical research letters
N2  - In this study we investigate a dayside, midlatitude plasma depletion (DMLPD) encountered on 22 May 2014 by the Swarm and GRACE satellites, as well as ground-based instruments. The DMLPD was observed near Puerto Rico by Swarm near 10 LT under quiet geomagnetic conditions at altitudes of 475-520 km and magnetic latitudes of similar to 25 degrees-30 degrees. The DMLPD was also revealed in total electron content observations by the Saint Croix station and by the GRACE satellites (430 km) near 16 LT and near the same geographic location. The unique Swarm constellation enables the horizontal tilt of the DMLPD to be measured (35 degrees clockwise from the geomagnetic east-west direction). Ground-based airglow images at Arecibo showed no evidence for plasma density depletions during the night prior to this dayside event. The C/NOFS equatorial satellite showed evidence for very modest plasma density depletions that had rotated into the morningside from nightside. However, the equatorial depletions do not appear related to the DMLPD, for which the magnetic apex height is about 2500 km. The origins of the DMLPD are unknown, but may be related to gravity waves.
Y1  - 2015
U6  - https://doi.org/10.1002/2014GL062655
SN  - 0094-8276
SN  - 1944-8007
VL  - 42
IS  - 4
SP  - 967
EP  - 974
PB  - American Geophysical Union
CY  - Washington
ER  -