Monitoring the moon's transient atmosphere with an all-sky imager

Abstract An indispensable tool in terrestrial aeronomy, all-sky imaging has recently been shown to be useful in studies of the Moon's exosphere. Two days after the peak of the 1998 Leonid meteor shower, an extended region of neutral sodium emission was detected in the night sky using a bare-CCD imaging system. The feature was found to be a train of sodium gas originating from the Moon. Subsequent observations indicate the feature is normally visible (max. brightness ∼15–90 Rayleighs (R)) during nights near the time of new Moon. Monthly monitoring of the feature using an all-sky system can provide useful information about the time-variability of the lunar atmosphere. Several processes are believed to be responsible for the production of lunar Na and evidence is presented indicating that two of these processes were each responsible for the observed brightness enhancements of the sodium feature on two separate new Moon periods in January and March 2000.

[1]  Jeffrey Baumgardner,et al.  Imaging experiments to detect an extended sodium atmosphere on the moon , 1993 .

[2]  M. Mendillo,et al.  Modeling an enhancement of the lunar sodium tail during the Leonid Meteor Shower of 1998 , 1999 .

[3]  S. Alan Stern,et al.  The lunar atmosphere: History, status, current problems, and context , 1999 .

[4]  Bodo W. Reinisch,et al.  Investigations of thermospheric‐ionospheric dynamics with 6300‐Å images from the Arecibo Observatory , 1997 .

[5]  M. Taylor,et al.  High resolution OI (630 nm) image measurements of F‐region depletion drifts during the Guará Campaign , 1997 .

[6]  M. Mendillo,et al.  Monochromatic imaging instrumentation for applications in aeronomy of the earth and planets , 1993 .

[7]  Steven Smith,et al.  Discovery of the distant lunar sodium tail and its enhancement following the Leonid Meteor Shower of 1998 , 1999 .

[8]  F. Heller,et al.  Preliminary paleomagnetic results from the Upper Carboniferous of Uliastai Block, Inner Mongolia, China , 1997 .

[9]  Michael J. Taylor,et al.  All‐sky measurements of short period waves imaged in the OI(557.7 nm), Na(589.2 nm) and near infrared OH and O2(0,1) nightglow emissions during the ALOHA‐93 Campaign , 1995 .

[10]  Bodo W. Reinisch,et al.  F layer ionization patches in the polar cap , 1983 .

[11]  R. Killen,et al.  Variation of lunar sodium during passage of the Moon through the Earth's magnetotail , 2000 .

[12]  D. Hunten,et al.  The sodium and potassium atmosphere of the moon and its interaction with the surface , 1992 .

[13]  A. Potter,et al.  Observations of the lunar sodium exosphere , 1991 .

[14]  M. Mendillo,et al.  Imaging observations of the extended sodium atmosphere of the Moon , 1991 .

[15]  M. Mendillo,et al.  OBSERVATIONAL TEST FOR THE SOLAR WIND SPUTTERING ORIGIN OF THE MOON'S EXTENDED SODIUM ATMOSPHERE , 1999 .

[16]  W. Feldman,et al.  Variation of lunar sodium emission intensity with phase angle (Paper 94GL01702) 2263 , 1994 .

[17]  D. Hunten,et al.  Observations of Sodium in the Lunar Atmosphere during International Lunar Atmosphere Week, 1995 , 1998 .

[18]  Chester S. Gardner,et al.  ALOHA‐93 measurements of intrinsic AGW characteristics using airborne airglow imager and groundbased Na wind/temperature lidar , 1995 .

[19]  D. P. Steele,et al.  Polar patches and the “tongue of ionization” , 1996 .

[20]  Takuji Nakamura,et al.  Distant lunar sodium tail observed in the Japanese local‐time sector during the Leonid meteor shower of 1998 , 2000 .

[21]  R. H. Eather,et al.  Dayside auroral dynamics , 1984 .