TY - JOUR
T1 - Plasma Blobs Concurrently Observed With Bubbles in the Asian-Oceanian Sector During Solar Maximum
AU - Wang, Zheng
AU - Liu, Huixin
AU - Shi, Jiankui
AU - Wang, Guojun
AU - Wang, Xiao
N1 - Funding Information:
We thank the reviewers for pertinent comments that helped to significantly improve this paper. We thank Y. Otsuka and T. Yokoyama for helpful discussions. Z. W. acknowledges support by the National Natural Science Foundation of China grants 41604137, 41474137, and 41674145; by the China Scholarship Council; and by the Specialized Research Fund for State Key Laboratory in China. H. L. acknowledges support from JSPS KAKENHI grants 18H01270, 18H04446, and 17KK0095. We acknowledge the use of data from the Chinese Meridian Project. The data can be accessed from the following: ROCSAT-1 ion density and drift velocity data: http://sdbweb.ss.ncu.edu.tw/iss_db.html; Ionosonde and scintillation data at Vanimo: http://www.sws.bom.gov.au/World_Data_Centre; and Ionosonde and scintillation data at Hainan: http://data.meridianproject.ac.cn/.
Publisher Copyright:
© 2019. American Geophysical Union. All Rights Reserved.
PY - 2019/1/1
Y1 - 2019/1/1
N2 - With simultaneous ionospheric measurements from ROCSAT-1 satellite and ground ionosondes/GPS receivers, three cases of concurrent plasma blobs and bubbles in the same magnetic meridian were observed around 22:30 LT in Asian-Oceanian sector during solar maximum. Two cases were observed: equatorial spread F (ESF) over Vanimo station (geog. 2.7°S, 141.3°E; geom. 11.2°S, 146.2°W) and plasma blobs around 8.0°S (geom.) on 1 June and 6 October 2003. The other case observed equatorial spread F over Hainan station (geog. 19.5°N, 109.1°E; geom. 9.1°N, 179.1°W) and plasma blob near the dip equator on 8 March 2004. Plasma blobs were all observed near 600-km height near the equator. Equatorial spread F and amplitude scintillations from the ground stations were observed near the same magnetic meridian, indicating the existence of bubbles. Considering that both plasma bubbles and blobs are field-aligned elongated structures, magnetic field line mapping shows that in the two cases at Vanimo, blobs were above bubbles, providing direct observational evidence for blob formation in the intermediate stage of plasma bubble evolution; in the case at Hainan, the blob and bubble were likely at similar height, and it could be generated by gravity wave.
AB - With simultaneous ionospheric measurements from ROCSAT-1 satellite and ground ionosondes/GPS receivers, three cases of concurrent plasma blobs and bubbles in the same magnetic meridian were observed around 22:30 LT in Asian-Oceanian sector during solar maximum. Two cases were observed: equatorial spread F (ESF) over Vanimo station (geog. 2.7°S, 141.3°E; geom. 11.2°S, 146.2°W) and plasma blobs around 8.0°S (geom.) on 1 June and 6 October 2003. The other case observed equatorial spread F over Hainan station (geog. 19.5°N, 109.1°E; geom. 9.1°N, 179.1°W) and plasma blob near the dip equator on 8 March 2004. Plasma blobs were all observed near 600-km height near the equator. Equatorial spread F and amplitude scintillations from the ground stations were observed near the same magnetic meridian, indicating the existence of bubbles. Considering that both plasma bubbles and blobs are field-aligned elongated structures, magnetic field line mapping shows that in the two cases at Vanimo, blobs were above bubbles, providing direct observational evidence for blob formation in the intermediate stage of plasma bubble evolution; in the case at Hainan, the blob and bubble were likely at similar height, and it could be generated by gravity wave.
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U2 - 10.1029/2018JA026373
DO - 10.1029/2018JA026373
M3 - Article
AN - SCOPUS:85070891815
SN - 0148-0227
VL - 124
SP - 7062
EP - 7071
JO - Journal of Geophysical Research
JF - Journal of Geophysical Research
IS - 8
ER -