Non-specular, vertically upward transit, fast-moving radar echoes are observed in the summer polar upper mesosphere near 90 km using 52 MHz VHF radar at Esrange, Sweden. By resolving maximum echo power movement, the unusual meteor trails propagate vertically upward with taking horizontal displacements at an initial speed of 10 km/s exponentially decreasing with increasing height from 85-89 km, lasting for 3.5 sec. Another upward transit is observed as following a downward transit echo target in about ~1 sec, lasting over 5 sec. The upward motion cannot be explained with the dynamics of penetrating meteors or by atmospheric dynamics. The observation proposes that secondary produced plasma jets occurring from meteor trail are possibly responsible for upward fast moving echoes. The long-lasting (3-5 sec), ascending meteor trails at speeds of a few 104 m/s are distinctive from any previous occurrences of meteors or upper atmospheric electrical discharges in the aspect of long-lasting upward/downward motions. This result possibly suggests a new type of meteor-trail leader discharge occurring in the summer polar upper mesosphere and lower thermosphere.

1. INTRODUCTION
 2. DATA ANALYSIS
 3.VERTICAL TRANSIT RADAR ECHOES
  3.1 Upward Transit Echo (For Jun 10, 2008)
  3.2 Downward and Upward Propagation Echoes(For June 22, 2006)
  3.3 Location of Echo Occurring (June 22, 2006)
 4. INTERPRETATION
 5. SUMMARY AND CONCLUSIONS
 ACKNOWLEDGMENTS
 REFERENCES

• Young-Sook Lee(Department of Astronomy and Space Science and Geology, Chungnam National University) Corresponding Author
• Sheila Kirkwood(Swedish Institute of Space Physics)
• Young-Sil Kwak(Korea Astronomy and Space Science Institute, Korea University of Science and Technology)