It appears you've shared a radioteletype (RTTY) transmission or amateur radio message. This format is typically used by ham radio operators to identify themselves and indicate their mode of communication.

Breaking down the elements:

- **00:45**: The time of transmission, in 24-hour format.

- **JR8WOW/1**:

- **JR8** likely indicates the operator's callsign, with "J" being a prefix used for Japanese amateur radio operators. However, ham radio operators can use "/1" or other suffixes to indicate their operational mode or station setup (e.g., /1 could mean operation at 1 Watt power).

- **JP-1246(Nakagawa Prefectural Park, JP-TK)**:

- **JP** is the country code for Japan.

- **-1234** might refer to a specific location's identifier. In amateur radio communications, these locations are known as "grid squares" or more specifically, in this case, it seems to be referring to a park or a location within Japan identified by its grid square JP-TK. However, the actual meaning and structure of "JP-1234" can vary depending on how geographic positions are referenced within amateur radio communications.

- **Nakagawa Prefectural Park** is identified as the location where the transmission is taking place.

- **JP-TK**: This could be another identifier for a specific grid square, indicating the position of JR8WOW/1.

- **10126 CW cw[JR8WOW]**:

- **10126 CW**: The frequency and mode of operation. "CW" stands for Continuous Wave, an old term for Morse code transmissions.

- **cw** seems redundant as it's already indicated by the "[CW]" in this context but is likely a repetition or clarification of the transmission mode.

- **[JR8WOW]**: The callsign of the transmitting station, possibly enclosed within square brackets to indicate it's part of the message content rather than part of the header.

In summary, this appears to be an amateur radio operator (JR8WOW/1) operating in Morse code on a specific frequency at Nakagawa Prefectural Park, identified by its grid square JP-TK.