MHD wave characteristics inferred from correlations between X-rays, VLF, and ULFs at Syowa Station, Antarctica and Tjönes, Iceland (L ~ 6)

Details MHD wave characteristics inferred from correlations between X-rays, VLF, and ULFs at Syowa Station, Antarctica and Tjönes, Iceland (L ~ 6) MHD wave characteristics inferred from correlations between X-rays, VLF, and ULFs at Syowa Station, Antarctica and Tjönes, Iceland (L ~ 6)

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999ep%26s...51...33h&link_type=abstract

Earth, Planets and Space, Volume 51, p. 33-41.

Computer Science

1

Scientific paper

The Polar Patrol Balloon No.6 (PPB#6) observed quasi-periodic pulsations of bremsstrahlung X-rays (E = 30 ~ 120keV) in the daytime of 0855UT (0914MLT) ~ 1630UT (1614MLT) on January 5, 1993, near Syowa Station, Antarctica (L ~ 6). The X-ray pulsations near the noon (1208:00UT (1216MLT) ~ 1225:04UT (1232MLT)) include a period of about 260sec, which corresponds to Pc5 magnetic pulsations. It was found that at Syowa Station and Tjönes, Iceland, which are both pair locations of the geomagnetic conjugacy, the X-ray pulsations are in correlation with the ULF-D pulsations. Also the Tjönes VLF (2kHz) pulsations correlated well with the X-ray pulsations of the period corresponding to Pc5. It is probable that the VLF- and ULF-associated X-rays or precipitating energetic electrons in the vicinity of the L ~ 6 shell are in synchronization with the electron-cyclotron resonance. Lastly, the so-called ballooning-mirror instability (the BMI) is a candidate to explain the compressional MHD waves that occur during the short time interval (1216MLT ~ 1232MLT) in which the experimental results were interpreted.

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